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260 results on '"fission tracks"'

252. L'uranium marqueur de la croissance cristalline : mise en évidence par les traces de fission dans les zircons gemmes d'Espaly (Haute-Loire, France)

Author

Isabelle Gagnol, Jean-Pierre Pupin, Didier Mailhé, and Joëlle Carpéna

Subjects
uranium, traces de fission, zirco s, croissance cristalline, fission tracks, zircons, crystal growth, General Earth and Planetary Sciences, General Environmental Science
Abstract

A precise fission track mapping of uranium has been carried out on zircon crystals from Espaly (Haute-Loire, France). Uranium appears to be a good marker of crystal growth. Oscillatory zoning of uranium and hourglass distribution yield information on growth rate and site of the uranium incorporation in zircon during the crystal growth., Une cartographie précise de l'uranium par fission neutronique induite a été effectuée sur les zircons gemmes d'Espaly. Il ressort de cette étude que les traces de fission de l'uranium peuvent être utilisées comme marqueurs de la croissance cristalline. Un phénomène oscillatoire dans la distribution de l'uranium, ainsi qu'une distribution en sablier, fournissent des précisions sur le mode et le lieu d'incorporation de cet élément dans ces zircons ainsi que sur la vitesse de cristallisation de ces minéraux., Carpéna Joëlle, Gagnol Isabelle, Mailhé Didier, Pupin Jean-Pierre. L'uranium marqueur de la croissance cristalline : mise en évidence par les traces de fission dans les zircons gemmes d'Espaly (Haute-Loire, France). In: Bulletin de Minéralogie, volume 110, 4, 1987. pp. 459-463.

Published
1987
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254. Twenty million years of continuous deformation along theKarakorum fault, western Tibet: A thermochronological analysis.

Author

Laboratoire de tectonique, mécanique de la lithosphère (LTML) ; CNRS - IPG PARIS - Université Paris VII - Paris Diderot, Géosciences Montpellier (GM) ; CNRS - Université Montpellier II - Sciences et techniques, Laboratoire de Sciences de la Terre (LST) ; CNRS - INSU - Université Claude Bernard - Lyon I (UCBL) - École Normale Supérieure (ENS) - Lyon, Institut für Geowissenschaften ; Universität Potsdam, Laboratoire de géodynamique des chaines alpines (LGCA) ; CNRS - INSU - OSUG - Université de Savoie - Université Joseph Fourier - Grenoble I, Institute of Geology ; Chinese Academy of Geological Sciences, Institut de Physique du Globe de Paris (IPGP) ; CNRS - INSU - IPG PARIS - Université Paris VII - Paris Diderot - Université de la Réunion - Université Pierre et Marie Curie (UPMC) - Paris VI, Valli, Franck, Arnaud, Nicolas, Leloup, Philippe-Hervé, Sobel, Edward, Mahéo, Gweltaz, Lacassin, R., Guillot, Stéphane, Haibing, Li, Tapponnier, Paul, Zhiquin, Xu, Laboratoire de tectonique, mécanique de la lithosphère (LTML) ; CNRS - IPG PARIS - Université Paris VII - Paris Diderot, Géosciences Montpellier (GM) ; CNRS - Université Montpellier II - Sciences et techniques, Laboratoire de Sciences de la Terre (LST) ; CNRS - INSU - Université Claude Bernard - Lyon I (UCBL) - École Normale Supérieure (ENS) - Lyon, Institut für Geowissenschaften ; Universität Potsdam, Laboratoire de géodynamique des chaines alpines (LGCA) ; CNRS - INSU - OSUG - Université de Savoie - Université Joseph Fourier - Grenoble I, Institute of Geology ; Chinese Academy of Geological Sciences, Institut de Physique du Globe de Paris (IPGP) ; CNRS - INSU - IPG PARIS - Université Paris VII - Paris Diderot - Université de la Réunion - Université Pierre et Marie Curie (UPMC) - Paris VI, Valli, Franck, Arnaud, Nicolas, Leloup, Philippe-Hervé, Sobel, Edward, Mahéo, Gweltaz, Lacassin, R., Guillot, Stéphane, Haibing, Li, Tapponnier, Paul, and Zhiquin, Xu

Abstract

The role of the Karakorum fault zone (KFZ) is debated. South of 33°N, ongoing dextral-oblique slip along the SW edge of the Gar basin exhumes metamorphic and magmatic rocks of the Ayilari range. Minerals have recorded a continuum of deformation from temperatures >600–400°C down to <250_C. The 40Ar/39Ar ages, the oldest being 21.2 ± 1.0 Ma, yield minimum estimates for the initiation of the KFZ. These are in agreement with the U-Th/Pb ages constraining the onset of deformation at ca 25–22 Ma. Thermochronologic results show slow cooling for the period ca 21– 14 Ma, followed by rapid cooling between 14 and 4 Ma. These data demonstrate that right-lateral motion was in progress in the early Miocene and that shear continued at least until 4 Ma, pointing to >20 Ma of deformation along the fault. Greenschist facies deformation superimposed upon the medium- to high-grade deformation marks a kinematic change from pure dextral to dextral-normal motion associated with the onset of rapid cooling. At the regional scale, the coexistence of transtension in the Gar basin with transpression documented along the Pangong range farther north suggests another example of the ‘‘zipper tectonics'' model developed along the Red River fault. The kinematic shift induced the rise of the Ayilari range starting at 16–12 Ma and the incision of major river courses. The Indus River might have become captive of the relief at this time. The river's 120 km of apparent offset implies dextral motion at a long-term rate of ca 8.5 ± 1.5 mm/yr.

259. Determina????o da concentra????o de ur??nio em ??guas pela t??cnica do registro de tra??os de fiss??o

Author

GERALDO, LUIZ P. and Olga Y. Mafra Guidicini

Subjects
uranium, dielectric track detectors, water, quantitative chemical analysis, fission tracks
Abstract

Made available in DSpace on 2014-10-09T12:53:13Z (GMT). No. of bitstreams: 0 Made available in DSpace on 2014-10-09T14:09:34Z (GMT). No. of bitstreams: 1 11664.pdf: 905420 bytes, checksum: 20644e6d8e90a917c6c5df56691bdf5d (MD5) Dissertacao (Mestrado) IEA/D Instituto de Energia Atomica - IEA

Published
1978

260. Desenvolvimento da tecnica do registro de tracos de fragmentos de fissao para determinacao de contaminacao de uranio

Author

TANAKA, E.M. and Olga Yajgunovitch Mafra Guidicini

Subjects
uranium, dielectric track detectors, hair, concentration ratio, fission tracks, urine, biological materials
Abstract

Made available in DSpace on 2014-10-09T12:50:38Z (GMT). No. of bitstreams: 0 Made available in DSpace on 2014-10-09T13:58:47Z (GMT). No. of bitstreams: 1 00041.pdf: 937519 bytes, checksum: 0151bbc43f38095f9eb0ca2ae90edfda (MD5) Dissertacao (Mestrado) IEA/D Escola Politecnica, Universidade de Sao Paulo - POLI/USP

Published
1978

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