دورية أكاديمية
Quantifying the axial magma lens dynamics at the roof of oceanic magma reservoirs (dike / gabbro transition): Oman Drilling Project GT3 site survey
| العنوان: | Quantifying the axial magma lens dynamics at the roof of oceanic magma reservoirs (dike / gabbro transition): Oman Drilling Project GT3 site survey |
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| المؤلفون: | France, Lyderic, Lombard, Maéva, Nicollet, Christian, Berthod, Carole, Debret, Baptiste, Koepke, Juergen, Ildefonse, Benoit, Toussaint, Aurore |
| المساهمون: | 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), Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement et la société-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Institut de Physique du Globe de Paris (IPGP (UMR_7154)), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut für Mineralogie Hannover, Leibniz Universität Hannover=Leibniz University Hannover, Géosciences Montpellier, Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), Institut des sciences de la terre Lausanne (ISTE), Université de Lausanne = University of Lausanne (UNIL) |
| المصدر: | ISSN: 2169-9313 ; EISSN: 2169-9356. |
| بيانات النشر: | HAL CCSD American Geophysical Union |
| سنة النشر: | 2021 |
| المجموعة: | HAL Clermont Auvergne (Université Blaise Pascal Clermont-Ferrand / Université d'Auvergne) |
| مصطلحات موضوعية: | fast-spreading oceanic centers, magma chamber, granoblastic dikes, heat flux, gabbros, [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography |
| الوصف: | International audience ; At oceanic spreading centers, the interactions between the igneous system that builds the crust, and the hydrothermal system that cools it govern the plumbing system architecture and its thermokinetic evolution. At fast-spreading centers, most of those interactions occur around the axial magma lens (AML) that feeds the upper crust, and possibly part of the underlying mushy igneous reservoir. Heat extracted from crystallizing AML is transferred through a conductive boundary layer to the overlying hydrothermal system. Quantifying the AML physical and thermal evolutions and its interactions with hydrothermal system is therefore essential to understand oceanic accretion. Those general issues were the rationale of drilling ICDP OmanDP Hole GT3A, and we present herein the geological, structural, and petrological data that were used as a site survey to select its location. GT3 area enables observations in three dimensions of fossilized AMLs and overlying dikes. The new field data and corresponding mineral compositions are used together with thermokinetic and thermodynamic models to deliver an integrated dynamic model for the AML / hydrothermal system interactions. Results attest that the isotropic gabbro interval is composite, with gabbro bodies intruding and reheating both gabbros and dikes (up to 1040°C). We show that AMLs should be considered as transient igneous bodies that likely crystallize from primitive MORBs in decades, releasing heat to the intruded hosts, and feeding high temperature vents on the seafloor. We show for the first time that the thermal gradient recorded in AML roof is consistent with the heat fluxes reported at active hydrothermal vents. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | hal-03194357; https://uca.hal.science/hal-03194357Test; https://uca.hal.science/hal-03194357/documentTest; https://uca.hal.science/hal-03194357/file/2020JB021496.pdfTest |
| DOI: | 10.1029/2020JB021496 |
| الإتاحة: | https://doi.org/10.1029/2020JB021496Test https://uca.hal.science/hal-03194357Test https://uca.hal.science/hal-03194357/documentTest https://uca.hal.science/hal-03194357/file/2020JB021496.pdfTest |
| حقوق: | http://creativecommons.org/licenses/by-ncTest/ ; info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.60FAC7A2 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1029/2020JB021496 |
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