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131 results on '"Mostefaoui S"'

3. Hydrogen in magnetite from asteroid Ryugu.

Author

Aléon, J., Mostefaoui, S., Bureau, H., Vangu, D., Khodja, H., Nagashima, K., Kawasaki, N., Abe, Y., Alexander, C. M. O'D., Amari, S., Amelin, Y., Bajo, K., Bizzarro, M., Bouvier, A., Carlson, R. W., Chaussidon, M., Choi, B.‐G., Dauphas, N., Davis, A. M., and Di Rocco, T.

Subjects
*SECONDARY ion mass spectrometry, *MAGNETITE crystals, *WATER harvesting, *MAGNETITE, *SOLAR system
Abstract

In order to gain insights on the conditions of aqueous alteration on asteroid Ryugu and the origin of water in the outer solar system, we developed the measurement of water content in magnetite at the micrometer scale by secondary ion mass spectrometry (NanoSIMS) and determined the H and Si content of coarse‐grained euhedral magnetite grains (polyhedral magnetite) and coarse‐grained fibrous (spherulitic) magnetite from the Ryugu polished section A0058‐C1001. The hydrogen content in magnetite ranges between ~900 and ~3300 wt ppm equivalent water and is correlated with the Si content. Polyhedral magnetite has low and homogenous silicon and water content, whereas fibrous magnetite shows correlated Si and water excesses. These excesses can be explained by the presence of hydrous Si‐rich amorphous nanoinclusions trapped during the precipitation of fibrous magnetite away from equilibrium and testify that fibrous magnetite formed from a hydrous gel with possibly more than 20 wt% water. An attempt to determine the water content in sub‐μm framboids indicates that additional calibration and contamination issues must be addressed before a safe conclusion can be drawn, but hints at elevated water content as well. The high water content in fibrous magnetite, expected to be among the first minerals to crystallize at low water–rock ratio, points to the control of water content by local conditions of magnetite precipitation rather than large‐scale alteration conditions. Systematic lithological variations associated with water‐rich and water‐poor magnetite suggest that the global context of alteration may be better understood if local water concentrations are compared with millimeter‐scale distribution of the various morphologies of magnetite. Finally, the high water content in the magnetite precursor gel indicates that the initial O isotopic composition in alteration water must not have been very different from that of the earliest magnetite crystals. [ABSTRACT FROM AUTHOR]

Published
2024
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10. NanoSIMS mapping and LA-ICP-MS chemical and U-Th-Pb data in monazite from a xenolith enclosed in andesite (Central Slovakia Volcanic Field)

Author

Didier, A., Bosse, V., Bouloton, J., Mostefaoui, S., Viala, M., Paquette, J., Devidal, J., and Duhamel, R.

Abstract

In this study, we use NanoSIMS element and isotope ratio mapping and LA-ICP-MS trace element measurements to elucidate the origins of monazites from a restitic xenolith enclosed in a 13.5±0.3Ma andesitic lava (Slovakia). The xenolith/lava interaction is mainly characterized by the growth of a plagioclase-bearing corona around the xenolith and magmatic garnet overgrowths on primary metamorphic garnets within the xenolith. NanoSIMS images (89Y, 139La, 208Pb, 232Th and 238U) and trace element analyses indicate that variations of HREE, Y and Eu contents in the monazite are correlated with the resorption and the following overgrowth of garnet and plagioclase in the xenolith. Three domains are distinguished in the monazite grains: the inherited Variscan core at ca. 310Ma (M1 domain) characterized by low Y and HREE contents and a weak negative Eu anomaly; the inner rim (M2 domain) crystallized during the growth of the plagioclase magmatic corona (large negative Eu anomaly) and the resorption of metamorphic garnet (high HREE and Y contents); and the external rim (M3 domain) crystallized during the growth of the plagioclase corona (large negative Eu anomaly) and during the crystallization of magmatic garnet (low Y, HREE contents) at ~13Ma, i.e. the age of the andesitic lava. The age and chemical zonation of the monazites attest to the preservation of primary monazite in the xenolith despite the interaction with the andesite lava. NanoSIMS imaging provides high-quality sub-µm scale images of the monazite that reveals chemical domains that were not distinguishable on WDS X-ray maps, especially for depleted elements such as U and Pb. Owing to its small size, the M2 domain could not be accurately dated by the LA-ICP-MS method. However, NanoSIMS isotopic maps reveal that the M2 domain has similar 208Pb/232Th isotope ratios to the M3 domain and thus similar ages. These results support the hypothesis that melt-assisted partial dissolution-precipitation in monazite efficiently records chemical and mineralogical changes during xenolith/lava interaction.

Published
2021

11. Timescales of shock processes in chondritic and martian meteorites

Author

Beck, P., Gillet, Ph., El Goresy, A., and Mostefaoui, S.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): P. Beck (corresponding author) [1]; Ph. Gillet [1]; A. El Goresy [2]; S. Mostefaoui [2] The accretion of the terrestrial planets from asteroid collisions and the delivery to the [...]

Published
2005
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12. Diversification in the Archean Biosphere: Insight from NanoSIMS of Microstructures in the Farrel Quartzite of Australia

Author

Oehler, D. Z, Robert, F, Walter, M. R, Sugitani, K, Meibom, A, Mostefaoui, S, and Gibson, E. K

Subjects
Exobiology
Abstract

The nature of early life on Earth is difficult to assess because potential Early Archean biosignatures are commonly poorly preserved. Interpretations of such materials have been contested, and abiotic or epigenetic derivations have been proposed (summarized in [1]). Yet, an understanding of Archean life is of astrobiological importance, as knowledge of early evolutionary processes on Earth could provide insight to development of life on other planets. A recently-discovered assemblage of organic microstructures in approx.3 Ga charts of the Farrel Quartzite (FQ) of Australia [2-4] includes unusual spindle-like forms and a variety of spheroids. If biogenicity and syngeneity of these forms could be substantiated, the FQ assemblage would provide a new view of Archean life. Our work uses NanoSIMS to further assess the biogenicity and syngeneity of FQ microstructures. In prior NanoSIMS studies [5-6], we gained an understanding of nano-scale elemental distributions in undisputed microfossils from the Neoproterozoic Bitter Springs Formation of Australia. Those results provide a new tool with which to evaluate poorly preserved materials that we might find in Archean sediments and possibly in extraterrestrial materials. We have applied this tool to the FQ forms.

Published
2010

13. 'Nano' Scale Biosignatures and the Search for Extraterrestrial Life

Author

Oehler, D. Z, Robert, F, Meibom, A, Mostefaoui, S, Selo, M, Walter, M. R, Sugitani, K, Allwood, A, Mimura, K, and Gibson, E. K

Subjects
Exobiology
Abstract

A critical step in the search for remnants of potential life forms on other planets lies in our ability to recognize indigenous fragments of ancient microbes preserved in some of Earth's oldest rocks. To this end, we are building a database of nano-scale chemical and morphological characteristics of some of Earth's oldest organic microfossils. We are primarily using the new technology of Nano-Secondary ion mass spectrometry (NanoSIMS) which provides in-situ, nano-scale elemental analysis of trace quantities of organic residues. The initial step was to characterize element composition of well-preserved, organic microfossils from the late Proterozoic (0.8 Ga) Bitter Springs Formation of Australia. Results from that work provide morphologic detail and nitrogen/carbon ratios that appear to reflect the well-established biological origin of these 0.8 Ga fossils.

Published
2008

15. 'Nano' Morphology and Element Signatures of Early Life on Earth: A New Tool for Assessing Biogenicity

Author

Oehler, D. Z, Mostefaoui, S, Meibom, A, Selo, M, McKay, D. S, and Robert, F

Subjects
Life Sciences (General)
Abstract

The relatively young technology of NanoSIMS is unlocking an exciting new level of information from organic matter in ancient sediments. We are using this technique to characterize Proterozoic organic material that is clearly biogenic as a guide for interpreting controversial organic structures in either terrestrial or extraterrestrial samples. NanoSIMS is secondary ion mass spectrometry for trace element and isotope analysis at sub-micron resolution. In 2005, Robert et al. [1] combined NanoSIMS element maps with optical microscopic imagery in an effort to develop a new method for assessing biogenicity of Precambrian structures. The ability of NanoSIMS to map simultaneously the distribution of organic elements with a 50 nm spatial resolution provides new biologic markers that could help define the timing of life s development on Earth. The current study corroborates the work of Robert et al. and builds on their study by using NanoSIMS to map C, N (as CN), S, Si and O of both excellently preserved microfossils and less well preserved, non-descript organics in Proterozoic chert from the ca. 0.8 Ga Bitter Springs Formation of Australia.

Published
2006

18. Development of a nanoSIMS analytical protocole to determine the sulphur isotopic composition of iron sulphides formed during anoxic corrosion

Author

Grousset, Sophie, Dauzères, A., Crusset, D., Deydier, V, Linard, Y., Mostefaoui, S., Urios, Laurent, Mercier, F., Neff, Delphine, Dillmann, Philippe, Laboratoire Archéomatériaux et Prévision de l'Altération (LAPA - UMR 3685), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), IRAMAT - Laboratoire Métallurgies et Cultures (IRAMAT - LMC), Institut de Recherches sur les Archéomatériaux (IRAMAT), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne (UBM)-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne (UBM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude et de recherche sur les Transferts et les Installations dans les Sols (IRSN/PRP-DGE/SRTG/LETIS), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM), Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude des Transferts dans les Sols et le sous-sol (DEI/SARG/LETS), and Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM)

Subjects
[CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

International audience; The presence of Sulphate-Reducing Bacteria (SRB) may influence the corrosion rate of ferrous objects by inducing iron sulphides precipitation [1]. The same phases are formed by biotic or abiotic ways. Yet, biotic iron sulphides are supposed to be depleted in heavy isotopes of sulphur relative to the starting sulfates [2]. So, sulphur isotopic composition analyses could enable to distinguish between an abiotic or biotic origin of the iron sulphides. Currently, the sulphur isotopic compositions of sulphates and sulphides are broadly determined by mass spectrometry on previously dissolved phases [3]. Yet, this methodology is not adapted to the iron sulphides located in the corrosion product layers of field samples, presents as strips of some micrometers size [4]. The approach developed in this study is based on the determination of the sulphur isotopic composition of iron sulphides within the corrosion product layers by nanoSIMS (nanoscale Secondary Ion Mass Spectrometry). This new diagnostic tool has been validated on model systems composed of iron coupons corroded in an anoxic solution with or without SRB, and on an iron bar corroded in an anoxic percolation cell in contact with clay and in presence of SRB. Results show that iron sulphides are depleted in 34 S when corrosion is active in presence of bacteria.

Published
2017

19. Bio-corrosion detection by sulphur isotopic fractionation measurements using nanoSIMS

Author

Grousset, Sophie, Mercier-Bion, Florence, Dauzères, A., Crusset, D., Deydier, V, Linard, Y., Mostefaoui, S., Neff, Delphine, Dillmann, Philippe, Laboratoire Archéomatériaux et Prévision de l'Altération (LAPA - UMR 3685), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), IRAMAT - Laboratoire Métallurgies et Cultures (IRAMAT - LMC), Institut de Recherches sur les Archéomatériaux (IRAMAT), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université Bordeaux Montaigne-Université de Technologie de Belfort-Montbeliard (UTBM), Laboratoire d'Etude des Transferts dans les Sols et le sous-sol (DEI/SARG/LETS), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne (UBM)-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne (UBM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude et de recherche sur les Transferts et les Installations dans les Sols (IRSN/PRP-DGE/SRTG/LETIS), and Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Bordeaux Montaigne-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

International audience; The presence of Sulphate-Reducing Bacteria (SRB) may influence the corrosion rate of ferrous objects by inducing iron sulphides precipitation. The same phases are formed by biotic or abiotic ways. Yet, biotic iron sulphides are supposed to be depleted in heavy isotopes of sulphur relative to the starting sulphates[1]. So, sulphur isotopic composition analyses enable to determine the (a-)biotic origin of the iron sulfides. Previously, a single study [2] devoted to corrosion issues had used the sulphur isotopic composition to determine the origin of sulphides compounds formed on Cu/Ni steel. However, the sulphur isotopic fractionation was obtained by global mass spectrometry from the precipitation into BaSO4 of the remaining sulphates of the corrosion experiment. This method is not adapted to the iron sulphides formed in field samples, presents as strips of some micrometers size [3]. To fill this analytical gap, in the study presented here, nanoSIMS (nanoscale Secondary Ion Mass Spectrometry) is used to determine the local sulphur isotopic composition of the iron sulphides within the corrosion product layers oftwo kinds offield samples: a short term system consisting of a steel coupon buried for 24 months in the Andra (French National Radioactive Waste Management Agency) Underground Research Laboratory devoted to research onthe geological disposal of radioactive waste at Bure (Grand Est, France); and long term systems composed of iron nails buried in the water-saturated soil of the archeological site of Glinet (Normandie, France) during around 500 years. Thus, thanks to the methodology developed the iron sulphide bio-origin is proved in both corroded samples.

Published
2017

20. The implications of carbonate nanophases in a 3.334 Ga-old microbial mat from the Barberton greenstone belt, South Africa

Author

Westall, F., BARBARA CAVALAZZI, Foucher, F., Andreazza, C., Rouzaud, J. N., Lemelle, L., Salomé, M., Simionovici, A., Marrocchi, Y., Meibom, A., Mostefaoui, S., Robert, F., Westall F., Cavalazzi B., Foucher F., Andreazza C., Rouzaud J.-N., Lemelle L., Salomé M., Simionovici A., Marrocchi Y., Meibom A., Mostefaoui S., and Robert F.

Subjects
Carbonate nanophase, Microbial mat, Barberton greenstone belt
Published
2009

21. Bulk oxygen isotopic composition of ultra-carbonaceous antarctic micrometeorites with the Nanosims

Author

Kakazu, Y., Engrand, C., Duprat, J., Briani, G., Bardin, N., Mostefaoui, S., Duhamel, R., Remusat, L., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), and Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)

Subjects
[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], Snow, Chondrites, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

23. Origine des excès extrêmes de 17O et 18O dans la météorite de Murchison : Minéralogie et composition isotopique de Si, Mg, C, N, S, Cl et H

Author

Aléon, J., Duprat, J., Robert, F., Aléon-Toppani, A., Rouzaud, J.-N., Mostefaoui, S., Thirouin, A., Le Testu, M., K. Weber, P., D. Hutcheon, I., Derenne, S., CSNSM AS, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Laboratoire de Minéralogie et Cosmochimie du Muséum (LMCM), Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), Instituto de Astrofísica de Andalucía (IAA), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Biogéochimie et écologie des milieux continentaux (Bioemco), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS), Laboratoire de géologie de l'ENS (LGE), École normale supérieure - Paris (ENS Paris)-École normale supérieure - Paris (ENS Paris), Laboratoire de minéralogie du Muséum National d'Histoire Naturelle (LMMNHN), Consejo Superior de Investigaciones Científicas [Spain] (CSIC), and Centre National de la Recherche Scientifique (CNRS)-AgroParisTech-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Recherche Agronomique (INRA)-École normale supérieure - Paris (ENS Paris)

Subjects
[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Published
2010

24. Context-oriented and transaction-based service provisioning

Author

Mostefaoui, S K and Younas, M

Abstract

This paper presents our approach for service provisioning in pervasive computing environments. The presented approach is based on the usage of context-aware features and transactions during the discovery and the deployment of composite services. Context ensures that the best service offers are selected to participate in a service composition. Transactions help in improving the reliability and efficiency of the composite services.

Published
2007

25. Molecular identification of the Deuterium-rich carrier in insoluble organic matter in carbonaceous chondrites

Author

Remusat, L., Robert, F., Meibom, A., Mostefaoui, S., Delpoux, O., Binet, L., Gourier, D., Derenne, S., Institut de Physique du Globe de Paris (IPGP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude de la Matière Extraterrestre / UMS Nano-analyses (LEME / UNA), Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie de la Matière Condensée de Paris (site ENSCP) (LCMCP (site ENSCP)), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2007
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26. Coordinated Studies of Pristine Concordia Micrometeorites

Author

Gounelle, M., Bleuet, P., Bonal, Lydie, Borg, Janet, Chaussidon, M., D'Hendecourt, Louis, Djouadi, Z., Duprat, J., Engrand, C., Ferroir, Tristan, Gillet, Philippe, Grossemy, F., Le Guillou, C., Lemelle, Laurence, Leroux, H., Marty, B., Meibom, A., Montagnac, Gilles, Mostefaoui, S., Quirico, Eric, Reynard, Bruno, Robert, F., Rouzaud, Jean-Noel, Simionovici, Alexandre, Van De Moortèle, Bertrand, Laboratoire d'Etude de la Matière Extraterrestre / UMS Nano-analyses (LEME / UNA), Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), European Synchrotron Radiation Facility (ESRF), Laboratoire de Planétologie de Grenoble (LPG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre de Recherches Pétrographiques et Géochimiques (CRPG), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Sciences de la Terre (LST), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Laboratoire de structures et propriétés de l'état solide - UMR 8008 (LSPES), Centre National de la Recherche Scientifique (CNRS)-Université de Lille, Sciences et Technologies, Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), and Université de Lille, Sciences et Technologies-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU]Sciences of the Universe [physics]
Abstract

International audience; We have set up a consortium of French scientists specialized in the microanalysis of extraterrestrial matter. We have tested our ability to generate reliable data, using a great diversity of techniques on submillimeter-sized samples within one month.

Published
2006

27. On Integrating Conversations into Web Services Composition

Author

Maamar, Zakaria, Kouadri Mostefaoui, S, Benslimane, Djamal, SI LIRIS, Équipe gestionnaire des publications, LNCS Springer, Laboratoire d'InfoRmatique en Image et Systèmes d'information (LIRIS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École Centrale de Lyon (ECL), and Université de Lyon-Université Lumière - Lyon 2 (UL2)

Subjects
[INFO]Computer Science [cs], [INFO] Computer Science [cs]
Abstract

later on, Plus tard

Published
2005

28. Self-Organisation : Paradigms and Applications

Author

Di Marzo-Serugendo, G, Foukia, N, Hassas, Salima, Karageorgos, A, Kouadri Mostefaoui, S, Rana, Of, Laboratoire d'InfoRmatique en Image et Systèmes d'information (LIRIS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École Centrale de Lyon (ECL), Université de Lyon-Université Lumière - Lyon 2 (UL2), G. Di Marzo Serugendo, A. Karageorgos, O.F. Rana, F. Zambonelli (eds), SI LIRIS, Équipe gestionnaire des publications, and G. Di Marzo Serugendo, A. Karageorgos, O.F. Rana, F. Zambonelli (eds)

Subjects
[INFO]Computer Science [cs], [INFO] Computer Science [cs]
Abstract

Not available, non disponible

Published
2004

29. Self-Organising Applications: A Survey

Author

Kouadri Mostefaoui, S, Rana, Of, Foukia, N, Hassas, Salima, Di Marzo-Serugendo, G, Van Aart, C, Karageorgos, A, SI LIRIS, Équipe gestionnaire des publications, G. Di Marzo-Serugendo, A.Karageorgos, O.F. Rana and F. Zambonellini, Laboratoire d'InfoRmatique en Image et Systèmes d'information (LIRIS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École Centrale de Lyon (ECL), Université de Lyon-Université Lumière - Lyon 2 (UL2), G. Di Marzo-Serugendo, A.Karageorgos, and O.F. Rana and F. Zambonellini

Subjects
[INFO]Computer Science [cs], [INFO] Computer Science [cs]
Abstract

Not available, Non disponible

Published
2003

30. Mineralogy and petrology of comet 81P/wild 2 nucleus samples

Author

Zolensky, M., Zega, T., Yano, H., Wirick, S., Westphal, A., Weisberg, M., Weber, I., Warren, J., Velbel, M., Tsuchiyama, A., Tsou, P., Toppani, A., Tomioka, N., Tomeoka, K., Teslich, N., Taheri, M., Susini, J., Stroud, R., Stephan, T., Stadermann, F., Snead, C., Simon, S., Simionovici, A., See, T., Robert, F., Rietmeijer, F., Rao, W., Perronnet, M., Papanastassiou, D., Okudaira, K., Ohsumi, K., Ohnishi, I., Nakamura-Messenger, K., Nakamura, T., Mostefaoui, S., Mikouchi, T., Meibom, A., Matrajt, G., Marcus, M., Leroux, H., Lemelle, L., Le, L., Lanzirotti, A., Langenhorst, F., Krot, A., Keller, L., Kearsley, A., Joswiak, D., Jacob, D., Ishii, H., Harvey, R., Hagiya, K., Grossman, L., Grossman, J., Graham, G., Gounelle, M., Gillet, P., Genge, M., Flynn, G., Ferroir, T., Fallon, S., Ebel, D., Dai, Z., Cordier, P., Clark, B., Chi, M., Butterworth, A., Brownlee, D., Bridges, J., Brennan, S., Brearley, A., Bradley, J., Bleuet, P., Bland, Phil, Bastien, R., Zolensky, M., Zega, T., Yano, H., Wirick, S., Westphal, A., Weisberg, M., Weber, I., Warren, J., Velbel, M., Tsuchiyama, A., Tsou, P., Toppani, A., Tomioka, N., Tomeoka, K., Teslich, N., Taheri, M., Susini, J., Stroud, R., Stephan, T., Stadermann, F., Snead, C., Simon, S., Simionovici, A., See, T., Robert, F., Rietmeijer, F., Rao, W., Perronnet, M., Papanastassiou, D., Okudaira, K., Ohsumi, K., Ohnishi, I., Nakamura-Messenger, K., Nakamura, T., Mostefaoui, S., Mikouchi, T., Meibom, A., Matrajt, G., Marcus, M., Leroux, H., Lemelle, L., Le, L., Lanzirotti, A., Langenhorst, F., Krot, A., Keller, L., Kearsley, A., Joswiak, D., Jacob, D., Ishii, H., Harvey, R., Hagiya, K., Grossman, L., Grossman, J., Graham, G., Gounelle, M., Gillet, P., Genge, M., Flynn, G., Ferroir, T., Fallon, S., Ebel, D., Dai, Z., Cordier, P., Clark, B., Chi, M., Butterworth, A., Brownlee, D., Bridges, J., Brennan, S., Brearley, A., Bradley, J., Bleuet, P., Bland, Phil, and Bastien, R.

Published
2006

31. Comet 81P/Wild 2 Under a Microscope

Author

Brownlee, D., Tsou, P., Aléon, J., Alexander, C., Araki, T., Bajt, S., Baratta, G., Bastien, R., Bland, Phil, Bleuet, P., Borg, J., Bradley, J., Brearley, A., Brenker, F., Brennan, S., Bridges, J., Browning, N., Brucato, J., Bullock, E., Burchell, M., Busemann, H., Butterworth, A., Chaussidon, M., Cheuvront, A., Chi, M., Cintala, M., Clark, B., Clemett, S., Cody, G., Colangeli, L., Cooper, G., Cordier, P., Daghlian, C., Dai, Z., D’Hendecourt, L., Djouadi, Z., Dominguez, G., Duxbury, T., Dworkin, J., Ebel, D., Economou, T., Fakra, S., Fairey, S., Fallon, S., Ferrini, G., Ferroir, T., Fleckenstein, H., Floss, C., Flynn, G., Franchi, I., Fries, M., Gainsforth, Z., Gallien, J., Genge, M., Gilles, M., Gillet, P., Gilmour, J., Glavin, D., Gounelle, M., Grady, M., Graham, G., Grant, P., Green, S., Grossemy, F., Grossman, L., Grossman, J., Guan, Y., Hagiya, K., Harvey, R., Heck, P., Herzog, G., Hoppe, P., Hörz, F., Huth, J., Hutcheon, I., Ignatyev, K., Ishii, H., Ito, M., Jacob, D., Jacobsen, C., Jacobsen, S., Jones, S., Joswiak, D., Jurewicz, A., Kearsley, A., Keller, L., Khodja, H., Kilcoyne, A., Kissel, J., Krot, A., Langenhorst, F., Lanzirotti, A., Le, L., Leshin, L., Leitner, J., Lemelle, L., Leroux, H., Liu, M., Luening, K., Lyon, I., MacPherson, G., Marcus, M., Marhas, K., Marty, B., Matrajt, G., McKeegan, K., Meibom, A., Mennella, V., Messenger, K., Messenger, S., Mikouchi, T., Mostefaoui, S., Nakamura, T., Newville, M., Nittler, L., Ohnishi, I., Ohsumi, K., Okudaira, K., Papanastassiou, D., Palma, R., Palumbo, M., Pepin, R., Perkins, D., Perronnet, M., Pianetta, P., Rao, W., Rietmeijer, F., Robert, F., Rost, D., Rotundi, A., Ryan, R., Sandford, S., Schwandt, C., See, T., Schlutter, D., Sheffield-Parker, J., Simionovici, A., Simon, S., Sitnitsky, I., Snead, C., Stephan, T., Stadermann, F., Steele, A., Stroud, R., Susini, J., Sutton, S., Suzuki, Y., Taheri, M., Taylor, S., Teslich, N., Tomeoka, K., Tomioka, N., Toppani, A., Trigo-Rodríguez, J., Troadec, D., Tsuchiyama, A., Tuzzolino, A., Tyliszczak, T., Uesugi, K., Velbel, M., Vellenga, J., Vicenzi, E., Vincze, L., Warren, J., Weber, I., Weisberg, M., Westphal, A., Wirick, S., Wooden, D., Wopenka, B., Wozniakiewicz, P., Wright, I., Yabuta, H., Yano, H., Young, E., Zare, R., Zega, T., Ziegler, K., Zimmerman, L., Zinner, E., Zolensky, M., Brownlee, D., Tsou, P., Aléon, J., Alexander, C., Araki, T., Bajt, S., Baratta, G., Bastien, R., Bland, Phil, Bleuet, P., Borg, J., Bradley, J., Brearley, A., Brenker, F., Brennan, S., Bridges, J., Browning, N., Brucato, J., Bullock, E., Burchell, M., Busemann, H., Butterworth, A., Chaussidon, M., Cheuvront, A., Chi, M., Cintala, M., Clark, B., Clemett, S., Cody, G., Colangeli, L., Cooper, G., Cordier, P., Daghlian, C., Dai, Z., D’Hendecourt, L., Djouadi, Z., Dominguez, G., Duxbury, T., Dworkin, J., Ebel, D., Economou, T., Fakra, S., Fairey, S., Fallon, S., Ferrini, G., Ferroir, T., Fleckenstein, H., Floss, C., Flynn, G., Franchi, I., Fries, M., Gainsforth, Z., Gallien, J., Genge, M., Gilles, M., Gillet, P., Gilmour, J., Glavin, D., Gounelle, M., Grady, M., Graham, G., Grant, P., Green, S., Grossemy, F., Grossman, L., Grossman, J., Guan, Y., Hagiya, K., Harvey, R., Heck, P., Herzog, G., Hoppe, P., Hörz, F., Huth, J., Hutcheon, I., Ignatyev, K., Ishii, H., Ito, M., Jacob, D., Jacobsen, C., Jacobsen, S., Jones, S., Joswiak, D., Jurewicz, A., Kearsley, A., Keller, L., Khodja, H., Kilcoyne, A., Kissel, J., Krot, A., Langenhorst, F., Lanzirotti, A., Le, L., Leshin, L., Leitner, J., Lemelle, L., Leroux, H., Liu, M., Luening, K., Lyon, I., MacPherson, G., Marcus, M., Marhas, K., Marty, B., Matrajt, G., McKeegan, K., Meibom, A., Mennella, V., Messenger, K., Messenger, S., Mikouchi, T., Mostefaoui, S., Nakamura, T., Newville, M., Nittler, L., Ohnishi, I., Ohsumi, K., Okudaira, K., Papanastassiou, D., Palma, R., Palumbo, M., Pepin, R., Perkins, D., Perronnet, M., Pianetta, P., Rao, W., Rietmeijer, F., Robert, F., Rost, D., Rotundi, A., Ryan, R., Sandford, S., Schwandt, C., See, T., Schlutter, D., Sheffield-Parker, J., Simionovici, A., Simon, S., Sitnitsky, I., Snead, C., Stephan, T., Stadermann, F., Steele, A., Stroud, R., Susini, J., Sutton, S., Suzuki, Y., Taheri, M., Taylor, S., Teslich, N., Tomeoka, K., Tomioka, N., Toppani, A., Trigo-Rodríguez, J., Troadec, D., Tsuchiyama, A., Tuzzolino, A., Tyliszczak, T., Uesugi, K., Velbel, M., Vellenga, J., Vicenzi, E., Vincze, L., Warren, J., Weber, I., Weisberg, M., Westphal, A., Wirick, S., Wooden, D., Wopenka, B., Wozniakiewicz, P., Wright, I., Yabuta, H., Yano, H., Young, E., Zare, R., Zega, T., Ziegler, K., Zimmerman, L., Zinner, E., and Zolensky, M.

Published
2006

34. 53Mn-53Cr ages of Kaidun carbonates

Author

PETITAT, M., primary, MARROCCHI, Y., additional, McKEEGAN, K. D., additional, MOSTEFAOUI, S., additional, MEIBOM, A., additional, ZOLENSKY, M. E., additional, and GOUNELLE, M., additional

Published
2011
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35. Identification and analysis of carbon-bearing phases in the Martian meteorite Nakhla

Author

Gibson, Jr., E. K., primary, McKay, D. S., additional, Clemett, S. J., additional, Thomas-Keprta, K. L., additional, Wentworth, S. J., additional, Robert, F., additional, Verchovsky, A. B., additional, Wright, I. P., additional, Pillinger, C. T., additional, Rice, T., additional, Van Leer, B., additional, Meibom, A., additional, Mostefaoui, S. M., additional, and Le, L., additional

Published
2006
Full Text
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39. The Isotopic Composition of Ultra-Carbonaceous Antarctic Micrometeorites Organics, Ion-Irradiation of Isotopically Heterogeneous Ices.

Author

Rojas, J., Duprat, J., Dartois, E., Wu, T.-D., Engrand, C., Nittler, L. R., Bardin, N., Augé, B., Boduch, Ph., Rothard, H., Chabot, M., Delauche, L., Mostefaoui, S., Rémusat, L., Stroud, R. M., and Guérin, B.

Subjects
PROTOPLANETARY disks, SECONDARY ion mass spectrometry, GALACTIC cosmic rays, INTERPLANETARY dust, ICE sheets, FILM condensation
Abstract

Introduction: Ultra Carbonaceous Antarctic MicroMeteorites (UCAMMs) are sub-millimeter extraterrestrial particles with high abundance of organic matter and low abundance of minerals (C/Si ? 10 - 103), identified independently in the French and Japanese micrometeorite collections [1-6]. The organic matter in UCAMMs present high N/C ratios ranging from 0.02 to 0.2 [2, 7] and can present extreme D/H ratio. The characteristics of UCAMMs suggest that they were formed by irradiation by Galactic Cosmic Rays (GCRs) of nitrogen-rich ice mantles at the surface of small icy bodies [4, 8]. We investigated the isotopic signature of light elements in the organic matter of UCAMMs to study their links with organic matter from carbonaceous chondrites and interplanetary dust particles (IDPs). We present here a summary of our recent results, including sample analyses and ice irradiation experiments that aim at synthesizing analogs of the organic matter in UCAMMs. NanoSIMS analyses of UCAMMs: the H, C and N isotopic compositions of the 4 UCAMMs DC06-05-94 (DC94), DC06-07-18 (DC18), DC06-14-309 (DC309) and DC06-04-43 (DC43) were analyzed by nanoscale secondary ion mass spectrometry (NanoSIMS) at the Carnegie Earth and Planets Laboratory, the Museum National d'Histoire Naturelle and the Institut Curie [9]. The 4 UCAMMs do not exhibit similar isotopic compositions, with δD bulk values ranging from 1000‰ to 9000‰, δ13C from -90‰ to 30‰ and δ15N from -120‰ to 270‰. Each UCAMM is characterized by isotopic heterogeneities, typically at scales of a few μm [9]. Ice irradiation experiments: We performed ice irradiation experiments during 3 sessions in 2019, 2020 and 2021 at GANIL (Caen, France) [10], using the IGLIAS experimental setup connected to the IRRSUD ion beam (0.5-1 MeV/u). We formed 10μm - thick ice films by gas condensation on IR-transparent windows cooled down to 10K [8, 11]. The ice films consisted in one layer of isotopically labeled ice (with D, 15N and/or 13C-rich ice) between 2 layers of isotopically unlabeled ice (14N2-12CH4 or 14NH3-12CH4), forming an ice sandwich. The labeled layer accounted for 1% to 4% of the total thickness. Ice sandwiches were subsequently irradiated by heavy ions and slowly warmed up to the room temperature to obtain refractory organic residues. The residues, exhibiting an IR signature comparable to that of the organic matter in UCAMMs [8], were subsequently analyzed by NanoSIMS at the Institut Curie, to map the H, C and N isotopic heterogeneities. This study shows that the ion-processing of ice sandwiches made of N2-CH4 form an organic refractory residue that keeps the large isotopic heterogeneities of the initial ice sandwich, while that of NH3-CH4 ice sandwiches appears less favorable to the formation of isotopic heterogeneities. Extreme isotopic heterogeneities at low scale were observed in organic residues, indicating that local preservation of the initial ice sandwich composition can occur, maybe related to sporadic events during the annealing of the ice films. Results and discussion: These irradiation experiments demonstrate the possibility to form large micron-scale isotopic heterogeneities in organic residues from multilayer, isotopically heterogeneous, ice precursors. The organic matter of UCAMMs can thus have formed by irradiation by GCRs of isotopically heterogeneous ice mantles. Numerical models of the evolution of the early solar system predict the existence of gaseous reservoirs isotopically fractionated in H, C and N at different locations in the protoplanetary disk [12, 13]. The parent body/bodies of UCAMMs may have inherited from these fractionated reservoirs, condensed on its/their surface under the form of ice mantles. The diversity of isotopic signatures from one UCAMM to another also suggest that UCAMMs do not have anomalies inherited from one single parent gaseous reservoir. Further investigations on the correlation of elemental and isotopic ratios in the organic matter of UCAMMs will bring new insights to better constrain the characteristics of the parent reservoirs of UCAMMs. Acknowledgments: This work was funded by contract ANR-18-CE31-0011, CNES (MIAMI2), DIM-ACAV+ (C3E), CNRS-INSU/IN2P3 (PNP). The work at CONCORDIA Station (Projet#1120) was supported by IPEV and PNRA. [ABSTRACT FROM AUTHOR]

Published
2022

40. NANOSIMS INVESTIGATION OF H- AND N-ISOTOPE DISTRIBUTIONS IN THE INSOLUBLE ORGANIC MATTER OF RYUGU SAMPLES.

Author

Remusat, L., Verdier-Paoletti, M., Mostefaoui, S., Yabuta, H., Engrand, C., Yurimoto, H., Nakamura, T., Noguchi, T., Okazaki, R., Naraoka, H., Sakamoto, K., Watanabe, S., Tsuda, Y., and Tachibana, S.

Subjects
POISSON distribution, CHONDRITES, ORGANIC compounds, ASTEROIDS, SOLAR system, SPACE environment, NATURAL history
Abstract

Introduction: Regolith samples of the carbonaceous asteroid 162173 Ryugu were returned by the Hayabusa2 spacecraft in December 2020. Preliminary investigation of selected grains from each sampling site has revealed the occurrence of an abundant macromolecular insoluble material, similar to that of carbonaceous chondrites [1]. Understanding the origin of organic matter on carbonaceous asteroids and its subsequent evolution due to secondary processes as well as space weathering is one of the prime goals of the Hayabusa2 sample-return mission. Isotope composition of organic material found in extraterrestrial samples is a powerful proxy for tracking its origin and evolution during the solar system events [2]. To document the H- and N-isotope signatures of IOM contained in the Ryugu samples, we have used the NanoSIMS installed at the National Muséum of Natural History in Paris. We present here data acquired on the IOM isolated from grains of two touchdown sites. We have imaged between 2800 and 3200 ?m2 of the IOM of chamber A and C, respectively. The comparison with the IOM of carbonaceous chondrites allows for evaluating the influence of space weathering and aqueous alteration on the IOM in carbonaceous asteroids. Results: N-isotope distributions: the bulk δ15N is +17.4‰ and +30‰ for the IOM of chamber A and chamber C, respectively. These IOMs contain both 15N-enriched and depleted carbonaceous grains, with 180‰<δ15N< 800‰ for hotspots and -380‰ < δ15N < -180‰ for coldspots. Hotspots define a Poisson distribution with a mode value of +241‰ and +348‰ for chamber A and chamber C, respectively. Elemental ratios: Bulk N/C, O/C and S/C of Ryugu IOM are 0.035, 0.12, 0.032, respectively, for chamber A and 0.027, 0.04, 0.025 for chamber C. The N/C ratio of individual 15N-rich and depleted grains are comprised between 0.01 and 0.07, with those in the IOM of A0106 being slightly more N rich. Similarly, O/C and S/C ratios are also slightly higher in A0106. H-isotope distribution: Ryugu IOM exhibits bulk enrichments in D with δD = +306‰ and +440‰ for chamber A and chamber C, respectively. Numerous D-rich hotspots, are observed, with +600‰ < δD < +6000‰. They define a Poisson distribution, with a mode value of +1030‰ and +1374‰ for chamber A and chamber C, respectively. Of note, a few D-depleted organic grains are also observed (-200‰ < δD < 0‰). Discussion: Subtle differences are observed between the IOM of chamber A and chamber C: the IOM is less enriched in heavy isotopes in chamber A, and more enriched in N, O and S. This may reflect some heterogeneity at the scale of the asteroid, or the influence of sampling depth, hence the influence of space weathering. However, the elemental and isotope compositions of the IOM in Ryugu are comparable to those of hydrated carbonaceous chondrites. The bulk δ15N in Ryugu IOM is commensurable to levels reported in CI chondrites, despite the occurrence of hotspots being more 15N-rich in Ryugu [3]. The range of δ15N covered by these hotspots is, however, consistent with the IOM of CM chondrites and Tagish Lake, but remains in the lower end of the hotspots in CR chondrites. The most notable difference is the bulk δD which is lower than in the IOM of hydrated carbonaceous chondrites. The distribution of δD in Ryugu IOM is consistent with the IOMs in CI and CM chondrites. We did not observe enrichments as large as those reported in CR chondrites and in Tagish Lake [4,5]. The abundance of D- and 15N-rich hotspots appears similar in Ryugu and carbonaceous chondrites. Differences between Ryugu and carbonaceous chondrites may result from different intensity of aqueous alteration or the impact of space weathering, which could have induced a decrease of D/H in organic compounds by H implantation. Acknowledgments: The NanoSIMS facility at MNHN in Paris is supported by CNRS and MNHN. L. R. is grateful to the European Research Council (ERC consolidator grant HYDROMA). [ABSTRACT FROM AUTHOR]

Published
2022

41. AT LEAST TWO PARENT BODIES FOR SHOCKED L CHONDRITES.

Author

Ciocco, M., Roskosz, M., Doisneau, B., Mostefaoui, S., Deloule, E., and Gounelle, M.

Subjects
CHONDRITES, PHOSPHATE minerals, SCANNING transmission electron microscopy, METEOROIDS, ASTROPHYSICAL collisions, RAMAN microscopy, METEORITES, COLLISION broadening
Abstract

Introduction: High pressure minerals from meteoritic shock melt veins are key to understand the collisional history of the Solar System. The L chondrites, the most shocked meteorites [1], present abundant shock melt veins from which we can retrace their history. To this day, their family of origin is still debated. The shock timescale of 7 chondrites was measured to deduce their parent body diameters. Moreover, we use tuite, a high pressure phosphate mineral to perform U-Pb datation by SIMS. We find a bimodal distribution of ages, which match closely the ages previously obtained for Creston and Novato, two other shocked L6 chondrites [2]. Samples and Methods: Seven samples were first studied by optical microscopy and Raman spectroscopy to identify high pressure (HP) polymorphs. Scanning Transmission Electron Microscopy (STEM) was then used to study microstructures and transformation/growth mechanisms. The EDX was used to locate eligible minerals for datation (phosphates). Combined STEM-EDX (UMET, Lille, France) and NanoSIMS (MNHN, Paris, France) chemical maps were finally collected on the same FIB sections in order to compare these two analytical approaches and produce chemical maps. The U and Pb isotope concentrations where then measured on the identified tuite grains with the help of a Cameca IMS 1280 LG SIMS (CRPG, Nancy France) for datation. Results: Multiple high pressure textures were observed in all seven samples. Polycristalline assemblages of ringwoodite are typically the dominant texture, but more exotic textures were also found. Some meteorites present ringwoodite as lamellae inside olivine crystals, whereas others seem to present an assemblage of MgSiO3 glass with akimotoite crystallites. Both these textures allowed us to investigate elemental diffusion induced by structural changes. We therefore calculated shock timescales following the methods described in [3,4]. For all our samples, assuming a temperature of 2400K [5], shock timescales ranging between 0.5 and 20 seconds were derived. The meteorites that do not contain ringwoodite lamellae have significantly higher shock timescales, between 11 and 16 seconds. These larger shock timescales were caused by an impact between larger bolides, including a parent body of at least 150km wide. This is significantly higher than parent-bodies with diameters around 70km required by the other group. In almost all meteorites, we find tuites inside the shock melt veins. The meteorites that do not contain tuite have at least shocked apatites and whitlockites, with shifted Raman spectra indicating a change in structure. We date both the host rock apatites and the shock vein phosphates. This allows us to obtain conclusive collision ages from a normal concordia diagram for two of our samples, one of each group. The tuites record collisions ages of 461+-57Ma for the group with the largest parent body, and 650+-160Ma for the group with the smaller parent body. The host rock minerals record upper intercepts of 4481Ma in both meteorites. Conclusion: Shocked L chondrites seem to define two groups, which are texturally different and appear to have a completely different history. A smaller, 70km-wide parent body exploded first (650 Ma ago) and yielded most of the shocked meteorites, and a larger one exploded in the cataclysmic collision known today as the "L chondrite parent body breakup" 470Ma ago. The upper intercept of 4481Ma could date the early separation of the original L chondrite parent body into different families. [ABSTRACT FROM AUTHOR]

Published
2022

42. 53Mn-53Cr ages of Kaidun carbonates.

Author

PETITAT, M., MARROCCHI, Y., McKEEGAN, K. D., MOSTEFAOUI, S., MEIBOM, A., ZOLENSKY, M. E., and GOUNELLE, M.

Subjects
CARBONATES, DOLOMITE, BRECCIA, CHONDRITES, ACCRETION (Astrophysics), PETROLOGY
Abstract

- We report the 53Mn-53Cr systematics of three dolomite grains from two different CI1 clasts contained within the Kaidun meteorite breccia. Three internal isochrones result in initial 53Mn/55Mn ratios of (4.2 ± 0.4) × 10−6, (4.6 ± 1.3) × 10−6, and (5.2 ± 1.1) × 10−6. These initial values are consistent with those measured for dolomite in the Orgueil CI1 chondrite (; ) but significantly lower than the initial ratio determined by from a combination of different carbonate types within various lithologies of the Kaidun meteorite. We construct an accretion scenario for the Kaidun breccia by comparing the mineralogy and formation time scales of carbonates in the Kaidun CI1 lithologies to the analogous ones of the CI1 chondrite Orgueil. In Orgueil, dolomite precipitation precedes the formation of the first bruennerite grains by a few million years (; ). As the CI1 clasts in Kaidun lack breunnerite grains, and considering that aqueous alteration occurred prior to reaccretion of the various clasts onto the Kaidun parent body (e.g., ), we hypothesize that after rapid accretion and early aqueous alteration occurring within the first approximately 4 Myr after solar system formation, impact disruption of several asteroids and their reassembly into the Kaidun parent asteroid was complete within an additional approximately 2 Myr. This confirms that aqueous alteration, impact, and reaccretion of material in the asteroid belt were early processes that began contemporaneously with chondrule formation. [ABSTRACT FROM AUTHOR]

Published
2011
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44. Correlation between relative ages inferred from 26Al and bulk compositions of ferromagnesian chondrules in least equilibrated ordinary chondrites

Author

TACHIBANA, S., NAGAHARA, H., MOSTEFAOUI, S., and KITA, N. T.

Abstract

Abstract—We have studied the relationship between bulk chemical compositions and relative formation ages inferred from the initial 26Al/27Al ratios for sixteen ferromagnesian chondrules in least equilibrated ordinary chondrites, Semarkona (LL3.0) and Bishunpur (LL3.1). The initial 26Al/27Al ratios of these chondrules were obtained by Kita et al. (2000) and Mostefaoui et al. (2002), corresponding to relative ages from 0.7 ± 0.2 to 2.4 −0.4/+0.7 Myr after calcium‐aluminum‐rich inclusions (CAIs), by assuming a homogeneous distribution of 26Al in the early solar system. The measured bulk compositions of the chondrules cover the compositional range of ferromagnesian chondrules reported in the literature and, thus, the chondrules in this study are regarded as representatives of ferromagnesian chondrules. The relative ages of the chondrules appear to correlate with bulk abundances of Si and the volatile elements (Na, K, Mn, and Cr), but there seems to exist no correlation of relative ages neither with Fe nor with refractory elements. Younger chondrules tend to be richer in Si and volatile elements. Our result supports the result of Mostefaoui et al. (2002) who suggested that pyroxene‐rich chondrules are younger than olivine‐rich ones.

Published
2003
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45. HRTEM characterization of Ca-Carbonate nanophases in a 3.334 Ga-old microbial mat from the Barberton greenstone belt, South Africa: implication for evolution of photosynthesis

Author

BARBARA CAVALAZZI, Westall, F., Andreazza, C., Rouzaud, J. N., Parisini, A., Lemelle, L., Simionovici, A., Foucher, F., Salomé, M., Marocchi, Y., Hofmann, A., Thiel, V., Mostefaoui, S., Meibom, A., Robert, F., Cavalazzi B., Westall F., Andreazza C., Rouzaud J.-N., Parisini A., Lemelle L., Simionovici A., Foucher F., Salomé M., Marocchi Y., Hofmann A., Thiel V., Mostefaoui S., Meibom A., and Robert F.

Subjects
HRTEM, Ca-Carbonate nanophase, Barberton

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