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Start Over Author "Lacombe, Olivier" Journal tectonophysics
14 results on '"Lacombe, Olivier"'

4. Editorial

Author

Agosta, Fabrizio, primary, Luetkemeyer, P. Benjamin, additional, Lamarche, Juliette, additional, Crider, Juliet G., additional, and Lacombe, Olivier, additional

Published
2016
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5. Inversion of calcite twin data for paleostress orientations and magnitudes: A new technique tested and calibrated on numerically-generated and natural data.

Author

Lacombe, Olivier, Parlangeau, Camille, Schueller, Sylvie, and Daniel, Jean-Marc

Subjects
*CALCITE, *CARBONATE rocks, *PLATE tectonics, *STRAINS & stresses (Mechanics), *BOOLEAN algebra
Abstract

The inversion of calcite twin data is a powerful tool to reconstruct paleostresses sustained by carbonate rocks during their geological history. Following Etchecopar's (1984) pioneering work, this study presents a new technique for the inversion of calcite twin data that reconstructs the 5 parameters of the deviatoric stress tensors from both monophase and polyphase twin datasets. The uncertainties in the parameters of the stress tensors reconstructed by this new technique are evaluated on numerically-generated datasets. The technique not only reliably defines the 5 parameters of the deviatoric stress tensor, but also reliably separates very close superimposed stress tensors (30° of difference in maximum principal stress orientation or switch between σ 3 and σ 2 axes). The technique is further shown to be robust to sampling bias and to slight variability in the critical resolved shear stress. Due to our still incomplete knowledge of the evolution of the critical resolved shear stress with grain size, our results show that it is recommended to analyze twin data subsets of homogeneous grain size to minimize possible errors, mainly those concerning differential stress values. The methodological uncertainty in principal stress orientations is about ± 10°; it is about ± 0.1 for the stress ratio. For differential stresses, the uncertainty is lower than ± 30%. Applying the technique to vein samples within Mesozoic limestones from the Monte Nero anticline (northern Apennines, Italy) demonstrates its ability to reliably detect and separate tectonically significant paleostress orientations and magnitudes from naturally deformed polyphase samples, hence to fingerprint the regional paleostresses of interest in tectonic studies. [ABSTRACT FROM AUTHOR]

Published
2018
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7. Aegean tectonics: Strain localisation, slab tearing and trench retreat

Author

Jolivet, Laurent, primary, Faccenna, Claudio, additional, Huet, Benjamin, additional, Labrousse, Loïc, additional, Le Pourhiet, Laetitia, additional, Lacombe, Olivier, additional, Lecomte, Emmanuel, additional, Burov, Evguenii, additional, Denèle, Yoann, additional, Brun, Jean-Pierre, additional, Philippon, Mélody, additional, Paul, Anne, additional, Salaün, Gwenaëlle, additional, Karabulut, Hayrullah, additional, Piromallo, Claudia, additional, Monié, Patrick, additional, Gueydan, Frédéric, additional, Okay, Aral I., additional, Oberhänsli, Roland, additional, Pourteau, Amaury, additional, Augier, Romain, additional, Gadenne, Leslie, additional, and Driussi, Olivier, additional

Published
2013
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13. From outcrop and petrographic studies to basin-scale fluid flow modelling: The use of the Albanian natural laboratory for carbonate reservoir characterisation

Author

Vilasi, Nadège, primary, Malandain, Julien, additional, Barrier, Laurie, additional, Callot, Jean-Paul, additional, Amrouch, Khalid, additional, Guilhaumou, Nicole, additional, Lacombe, Olivier, additional, Muska, Kristaq, additional, Roure, François, additional, and Swennen, Rudy, additional

Published
2009
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14. Aegean tectonics: Strain localisation, slab tearing and trench retreat

Author

Loïc Labrousse, Melody Philippon, Patrick Monié, Olivier Driussi, Hayrullah Karabulut, Romain Augier, Roland Oberhänsli, E. Burov, Emmanuel Lecomte, Anne Paul, Aral I. Okay, Amaury Pourteau, G. Salaün, Jean-Pierre Brun, Claudio Faccenna, Yoann Denèle, Olivier Lacombe, Laurent Jolivet, Claudia Piromallo, Leslie Gadenne, Frédéric Gueydan, Laetitia Le Pourhiet, Benjamin Huet, Jolivet, Laurent, Faccenna, Claudio, Huet, Benjamin, Labrousse, Loic, Le Pourhiet, Laetitia, Lacombe, Olivier, Lecomte, Emmanuel, Burov, Evguenii, Denele, Yoann, Brun Jean, Pierre, Philippon, Melody, Paul, Anne, Salaue, Gwenaelle, Karabulut, Hayrullah, Piromallo, Claudia, Monie, Patrick, Gueydan, Frederic, Okay Aral, I., Oberhaesli, Roland, Pourteau, Amaury, Augier, Romain, Gadenne, Leslie, Driussi, Olivier, Institut des Sciences de la Terre de Paris (iSTeP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Géosciences Environnement Toulouse (GET), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Géosciences Rennes (GR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), Géosciences Montpellier, and Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Hellenic arc, Rift, Metamorphic core complex, Continental crust, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, North Anatolian Fault, Late Miocene, Paleontology, Geophysics, Lithosphere, Slab, Seismology, Geology, Earth-Surface Processes
Abstract

International audience; We review the geodynamic evolution of the Aegean-Anatolia region and discuss strain localisation there over geological times. From Late Eocene to Present, crustal deformation in the Aegean backarc has localised progressively during slab retreat. Extension started with the formation of the Rhodope Metamorphic Core Complex (Eocene) and migrated to the Cyclades and the northern Menderes Massif (Oligocene and Miocene), accommodated by crustal-scale detachments and a first series of core complexes (MCCs). Extension then localised in Western Turkey, the Corinth Rift and the external Hellenic arc after Messinian times, while the North Anatolian Fault penetrated the Aegean Sea. Through time the direction and style of extension have not changed significantly except in terms of localisation. The contributions of progressive slab retreat and tearing, basal drag, extrusion tectonics and tectonic inheritance are discussed and we favour a model (1) where slab retreat is the main driving engine, (2) successive slab tearing episodes are the main causes of this stepwise strain localisation and (3) the inherited heterogeneity of the crust is a major factor for localising detachments. The continental crust has an inherited strong heterogeneity and crustal-scale contacts such as major thrust planes act as weak zones or as zones of contrast of resistance and viscosity that can localise later deformation. The dynamics of slabs at depth and the asthenospheric flow due to slab retreat also have influence strain localisation in the upper plate. Successive slab ruptures from the Middle Miocene to the Late Miocene have isolated a narrow strip of lithosphere, still attached to the African lithosphere below Crete. The formation of the North Anatolian Fault is partly a consequence of this evolution. The extrusion of Anatolia and the Aegean extension are partly driven from below (asthenospheric flow) and from above (extrusion of a lid of rigid crust).

Published
2013

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