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2 results on '"crocodile structure"'

1. Control of lithosphere rheology on subduction polarity at initiation: Insights from 3D analogue modelling

Author

Midtkandal, Ivar, Brun, Jean-Pierre, Gabrielsen, Roy H., and Huismans, Ritske S.

Subjects
*LITHOSPHERE, *RHEOLOGY, *SUBDUCTION, *GEOMAGNETIC reversals, *OROGENIC belts, *EARTH'S mantle, *EARTH (Planet)
Abstract

Abstract: A series of analogue experiments was used to explore how lateral variations in lithosphere rheology may result in a subduction polarity reversal. Lithosphere models made of sand and silicone putty were designed to represent a plate convergence setting varying laterally from continent–continent to ocean–continent. Several experiments were performed to test the effects of strength profile variations in the converging plates. The modelling outcomes categorized into models that develop with and without a subduction polarity reversal. While a subduction polarity reversal was the most prevalent experiment outcome, the results suggest that upper mantle strength is the dominant factor in determining whether a subduction polarity shift occurs, or not. A weak upper mantle layer promotes obduction of the oceanic lithosphere in the western segment of the model. In model iterations where the upper mantle of the continental lithosphere was stronger than the oceanic lithosphere, a reversal in subduction polarity from north-dipping in the east, to south-dipping in the west occurred. The experiment design was inspired by the Iberian–Eurasian plate convergence and may provide a simple regional-scale explanation for the deformation patterns along the Pyrenean and Cantabrian orogen. [Copyright &y& Elsevier]

Published
2013
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2. Control of lithosphere rheology on subduction polarity at initiation: Insights from 3D analogue modelling

Author

Ritske S. Huismans, Roy H. Gabrielsen, Ivar Midtkandal, Jean-Pierre Brun, Department of Geosciences [Oslo], Faculty of Mathematics and Natural Sciences [Oslo], University of Oslo (UiO)-University of Oslo (UiO), Systèmes Tectoniques, Géosciences Rennes (GR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Centre National de la Recherche Scientifique (CNRS), Department of Earth Science [Bergen] (UiB), University of Bergen (UiB), Dubigeon, Isabelle, 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)-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), Department of Earth Science [Bergen], and University of Bergen (UIB)

Subjects
010504 meteorology & atmospheric sciences, Polarity (physics), [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, 010502 geochemistry & geophysics, 01 natural sciences, Obduction, Geochemistry and Petrology, Lithosphere, Earth and Planetary Sciences (miscellaneous), Convergent boundary, Eclogitization, 0105 earth and related environmental sciences, Polarity reversal, Subduction, Cantabrians, Pyrenees, transfer zone, contraction, Geophysics, crocodile structure, Space and Planetary Science, Analogue modelling, [SDU.STU] Sciences of the Universe [physics]/Earth Sciences, subduction, Geology
Abstract

International audience; A series of analogue experiments was used to explore how lateral variations in lithosphere rheology may result in a subduction polarity reversal. Lithosphere models made of sand and silicone putty were designed to represent a plate convergence setting varying laterally from continent-continent to ocean-continent. Distinct series of experiments were performed to test the effects of strength profile variations in the converging plates. The modelling outcomes categorized into models that develop with and without a subduction polarity reversal. While a subduction polarity reversal was the most prevalent experiment outcome, the results suggest that upper mantle strength is the dominant factor in determining whether a subduction polarity shift occurs, or not. A weak upper mantle layer promotes obduction of the oceanic lithosphere in the western segment of the model. In model iterations where the upper mantle of the continental lithosphere was stronger than the oceanic lithosphere, a reversal in subduction polarity from north-dipping in the east, to south-dipping in the west occurred. The experiment design was inspired by the Iberian-Eurasian plate convergence and may provide a simple regional-scale explanation to the deformation patterns along the Pyrenean and Cantabrian orogeny.

Published
2013
Full Text
View/download PDF

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