Academic Journal
Protracted subduction of the European hyperextended margin revealed by rutile U‐Pb geochronology across the Dora‐Maira massif (W. Alps)
| العنوان: | Protracted subduction of the European hyperextended margin revealed by rutile U‐Pb geochronology across the Dora‐Maira massif (W. Alps) |
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| المؤلفون: | Bonnet, Guillaume, Chopin, Christian, Locatelli, Michele, Kylander-Clark, Andrew, Hacker, Bradley |
| المساهمون: | Institut des Sciences de la Terre de Paris (iSTeP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Department of Earth Science Santa Barbara (GEOL-UCSB), University of California Santa Barbara (UC Santa Barbara), University of California (UC)-University of California (UC), Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL), Università degli studi di Genova = University of Genoa (UniGe) |
| المصدر: | ISSN: 0278-7407. |
| بيانات النشر: | HAL CCSD American Geophysical Union (AGU) |
| سنة النشر: | 2022 |
| المجموعة: | Aix-Marseille Université: HAL |
| مصطلحات موضوعية: | rutile, U-Pb geochronology, Laser-Ablation Split-Stream, Dora-Maira, continental subduction, Western Alps, hyperextended margin, exhumation, [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography, [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
| الوصف: | International audience ; The Dora-Maira massif is an archetypal nappe stack of subducted and exhumed upper crust. Slices of continental crust experienced metamorphism at upper blueschist to ultrahigh-pressure (UHP) eclogite-facies conditions. While the timing of peak metamorphism in the UHP unit has been extensively studied, little is known about the other units. In order to constrain the timing and conditions of high-pressure metamorphism, U-Pb-trace element analyses of rutile and titanite were carried out across the nappe stack. The data reveal Alpine peak metamorphic ages younging downwards in the stack, from ~40 Ma to ~33 Ma. Greenschist-facies retrogression of the whole massif occurred at ~32-31 Ma, after high-pressure metamorphism of the lowermost unit (Sanfront-Pinerolo Unit). Tectonic implications include (1) continuous and fast exhumation of subducted continental crust, (2) long-lived subduction from ~60 Ma until ~33 Ma of the distal European margin, reconstructed to be a hyperextended margin spread over ~130 km for the Dora-Maira massif alone, and (3) the initiation of continental collision synchronous with the end of high-pressure metamorphism. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1029/2021TC007170 |
| الاتاحة: | https://hal.science/hal-03620334 https://hal.science/hal-03620334v1/document https://hal.science/hal-03620334v1/file/Tectonics%20-%202022%20-%20Bonnet%20-%20Protracted%20subduction%20of%20the%20European%20hyperextended%20margin%20revealed%20by%20rutile%20U%E2%80%90Pb.pdf https://doi.org/10.1029/2021TC007170 |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.7CCF24B4 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1029/2021TC007170 |
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