Academic Journal
Depth Dependent Deformation and Anisotropy of Pyrolite in the Earth's Lower Mantle
| العنوان: | Depth Dependent Deformation and Anisotropy of Pyrolite in the Earth's Lower Mantle |
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| المؤلفون: | Gay, Jeffrey-Phillip, Ledoux, Estelle, Krug, Matthias, Chantel, Julien, Pakhomova, Anna, Sanchez‐valle, Carmen, Speziale, Sergio, Merkel, Sébastien |
| المساهمون: | Unité Matériaux et Transformations - UMR 8207 (UMET), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Westfälische Wilhelms-Universität Münster = University of Münster (WWU), Deutsches Elektronen-Synchrotron Hamburg (DESY), German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ), ANR-17-CE31-0025,TIMEleSS,Transformations de phase, microstructures, et leur signatures sismiques dans le manteau terrestre(2017) |
| المصدر: | ISSN: 0094-8276. |
| بيانات النشر: | HAL CCSD American Geophysical Union |
| سنة النشر: | 2024 |
| المجموعة: | LillOA (HAL Lille Open Archive, Université de Lille) |
| مصطلحات موضوعية: | [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] |
| الوصف: | International audience ; AbstractSeismic anisotropy is a powerful tool to map deformation processes in the deep Earth. Below 660 km, however, observations are scarce and conflicting. In addition, the underlying crystal scale mechanisms, leading to microstructures and crystal orientations, remain poorly constrained. Here, we use multigrain X‐ray diffraction in the laser‐heated diamond anvil cell to investigate the orientations of hundreds of grains in pyrolite, a model composition of the Earth's mantle, at in situ pressure and temperature. Bridgmanite in pyrolite exhibits three regimes of microstructures, due to transformation and deformation at low and high pressure. These microstructures result in predictions of 1.5%–2% shear wave splitting between 660 and 2,000 km with reversals in fast S‐wave polarization direction at about 1,300 km depth. Anisotropy can develop in pyrolite at lower mantle conditions, but pressure has a significant impact on the plastic behavior of bridgmanite, and hence seismic observations, which may explain conflicting anisotropy observations. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | hal-04609044; https://hal.univ-lille.fr/hal-04609044; https://hal.univ-lille.fr/hal-04609044/document; https://hal.univ-lille.fr/hal-04609044/file/gay2024grl.pdf; WOS: 001241605500001 |
| DOI: | 10.1029/2024gl109433 |
| الاتاحة: | https://hal.univ-lille.fr/hal-04609044 https://hal.univ-lille.fr/hal-04609044/document https://hal.univ-lille.fr/hal-04609044/file/gay2024grl.pdf https://doi.org/10.1029/2024gl109433 |
| Rights: | http://creativecommons.org/licenses/by/ ; info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.4BD9D570 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1029/2024gl109433 |
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