Dynamics of dikes versus cone sheets in volcanic systems
| العنوان: | Dynamics of dikes versus cone sheets in volcanic systems |
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| المؤلفون: | Régis Mourgues, Olivier Galland, Steffi Burchardt, Cédric Bulois, Erwan Hallot |
| المساهمون: | Physics of Geological Processes [Oslo] (PGP), Department of Physics [Oslo], Faculty of Mathematics and Natural Sciences [Oslo], University of Oslo (UiO)-University of Oslo (UiO)-Faculty of Mathematics and Natural Sciences [Oslo], University of Oslo (UiO)-University of Oslo (UiO)-Department of Geosciences [Oslo], University of Oslo (UiO)-University of Oslo (UiO), Department of Earth Sciences - Palaeobiology [Uppsala], Uppsala University, Géosciences Rennes (GR), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Laboratoire de Planétologie et Géodynamique [UMR 6112] (LPG), Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-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), Solid Earth Geology, Terre, Temps, Traçage, 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), 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) |
| المصدر: | Proceedings GeoMod 2016 Geomod Conference 2016 Geomod Conference 2016, Oct 2016, Montpellier, France Journal of Geophysical Research Journal of Geophysical Research, 2014, 119 (8), pp.6178-6192. ⟨10.1002/2014JB011059⟩ Journal of Geophysical Research, American Geophysical Union, 2014, 119 (8), pp.6178-6192. ⟨10.1002/2014JB011059⟩ |
| بيانات النشر: | HAL CCSD, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Volcanic hazards, Dike, 010504 meteorology & atmospheric sciences, dimensional analysis, Mineralogy, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, 010502 geochemistry & geophysics, 01 natural sciences, dimensionless phase diagram, Physics::Geophysics, Geochemistry and Petrology, laboratory modeling, Earth and Planetary Sciences (miscellaneous), Petrology, 0105 earth and related environmental sciences, geography, geography.geographical_feature_category, dike, Crust, magma emplacement, cone sheet, Igneous rock, Geophysics, Volcano, Space and Planetary Science, Magma, Cone sheet, Geology, Dimensionless quantity |
| الوصف: | International audience; Igneous sheet intrusions of various shapes, such as dikes and cone sheets, coexist as parts of complex volcanic plumbing systems likely fed by common sources. How they form is fundamental regarding volcanic hazards, yet no dynamic model simulates and predicts satisfactorily their diversity. Here we present scaled laboratory experiments that reproduced dikes and cone sheets under controlled conditions. Our models show that their formation is governed by a dimensionless ratio (Π1), which describes the geometry of the magma source, and a dynamic dimensionless ratio (Π2), which compares the viscous stresses in the flowing magma to the host rock strength. Plotting our experiments against these two numbers results in a phase diagram evidencing a dike and a cone sheet field, separated by a sharp transition that fits a power law. This result shows that dikes and cone sheets correspond to distinct physical regimes of magma emplacement in the crust. For a given host rock strength, cone sheets preferentially form when the source is shallow, relative to its lateral extent, orwhen the magma influx velocity (or viscosity) is high. Conversely, dikes form when the source is deep compared to its size, or when magma influx rate (or viscosity) is low. Both dikes and cone sheets may form fromthe same source, the shift fromone regime to the other being then controlled by magma dynamics, i.e., different values of Π2. The extrapolated empirical dike-to-cone sheet transition is in good agreement with the occurrence of dikes and cone sheets in various natural volcanic settings. |
| اللغة: | English |
| تدمد: | 0148-0227 2156-2202 |
| DOI: | 10.1002/2014JB011059⟩ |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aef959c28d8ec1dca5bdee3030305ed4 https://hal-insu.archives-ouvertes.fr/insu-01396996 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....aef959c28d8ec1dca5bdee3030305ed4 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 01480227 21562202 |
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| DOI: | 10.1002/2014JB011059⟩ |