Crustal structure and gravity anomalies beneath the Rif, northern Morocco: implications for the current tectonics of the Alboran region
| العنوان: | Crustal structure and gravity anomalies beneath the Rif, northern Morocco: implications for the current tectonics of the Alboran region |
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| المؤلفون: | Carole Petit, Laetitia Le Pourhiet, Michel Corsini, Mickael Bonnin, Bruno Scalabrino, Adrien Romagny |
| المساهمون: | Géoazur (GEOAZUR 7329), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA), Institut des Sciences de la Terre de Paris (iSTeP), Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | Geophysical Journal International Geophysical Journal International, Oxford University Press (OUP), 2015, 202 (1), pp.640-652. ⟨10.1093/gji/ggv169⟩ Geophysical Journal International, Oxford University Press (OUP), 2015, 202, pp.640-652. ⟨10.1093/gji/ggv169⟩ Geophysical Journal International, 2015, 202, pp.640-652. ⟨10.1093/gji/ggv169⟩ |
| بيانات النشر: | HAL CCSD, 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Gravity anomalies and Earth structure, Continental tectonics: compressional, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Crust, Mantle (geology), Gravity anomaly, Tectonics, Ocean surface topography, Kinematics of crustal and mantle deformation, Geophysics, Tectonic uplift, Dynamics of lithosphere and mantle, 13. Climate action, Geochemistry and Petrology, Receiver function, Africa, Seismology, Bouguer anomaly, Geology |
| الوصف: | International audience; We analyse Bouguer anomaly data and previously published Moho depths estimated from receiver functions in order to determine the amount of isostatic compensation or uncompensa-tion of the Rif topography in northern Morocco. We use Moho depth variations extracted from receiver function analyses to predict synthetic Bouguer anomalies that are then compared to observed Bouguer anomaly. We find that Moho depth variations due to isostatic compensation of topographic and/or intracrustal loads do not match Moho depth estimates obtained from receiver function analyses. The isostatic misfit map evidences excess crustal root as large as 10 km in the western part of the study area, whereas a 'missing' crustal root of ∼5 km appears east of 4.3 • E. This excess root/missing topography correlates with the presence of a dense mantle lid, the noticeable southwestward drift of the Western Rif area, and with a current surface uplift. We propose that a delaminated mantle lid progressively detaching westward or southwestward from the overlying crust is responsible for viscous flow of the ductile lower crust beneath the Rif area. This gives rise to isostatic uplift and westward drift due to viscous coupling at the upper/lower crust boundary. At the same time, the presence of this dense sinking mantle lid causes a negative dynamic topography, which explains why the observed topography is too low compared to the crustal thickness. |
| اللغة: | English |
| تدمد: | 0956-540X 1365-246X |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::39df37a87e7e36547f2f3f3e79d54ef4 https://hal.archives-ouvertes.fr/hal-01231076 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....39df37a87e7e36547f2f3f3e79d54ef4 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 0956540X 1365246X |
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