The Red Beds series in the Erta Ale segment, North Afar. Evidence for a 6 Ma-old post-rift basin prior to continental rupturing
| Autor: | S. Leleu, Gilles Chazot, Gezahegn Yirgu, B. Le Gall, Raphaël Pik, Christophe Cloquet, F. Chauvet, Dereje Ayalew, Fred Jourdan |
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| Přispěvatelé: | Laboratoire Géosciences Océan (LGO), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Centre de géochimie de la surface (CGS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), 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), Western Australian Argon Isotope Facility, Department of Applied Geology & JdL-CMS, Curtin University [Perth], Planning and Transport Research Centre (PATREC)-Planning and Transport Research Centre (PATREC), School of Earth Sciences [Addis Ababa], Addis Ababa University (AAU) |
| Rok vydání: | 2018 |
| Předmět: |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics
Basalt geography Red beds geography.geographical_feature_category Rift 010504 meteorology & atmospheric sciences 010502 geochemistry & geophysics 01 natural sciences Volcanic rock Paleontology Tectonics Geophysics Basement (geology) Sill [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology Alluvium [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology ComputingMilieux_MISCELLANEOUS [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Tectonophysics Tectonophysics, Elsevier, 2018, 747-748, pp.373-389. ⟨10.1016/j.tecto.2018.10.002⟩ |
| ISSN: | 0040-1951 1879-3266 |
| DOI: | 10.1016/j.tecto.2018.10.002 |
| Popis: | The Erta Ale rift segment, North Afar, is regarded as the most mature rift part within the entire Afar rift system. Very little is known about its deformation history because of limited exposures of geological records in its inner floor, except volcanics of the Erta Ale chain, and the poorly-known Red Beds series along the flanks of the depression. An integrated study, combining sedimentological, geochemical, 40Ar-39Ar radiometric and tectonic approaches, has been devoted to Red Beds series flanking the depression to the SW. Our new results allow to argue that (1) the >300 m-thick Red Beds exposed section comprises alluvial deposits that enclose (2) basaltic lavas and related sill intrusions that both yield ~6 Ma 40Ar-39Ar ages and display similar geochemical affinities, (3) the Red Beds series locally overlap unconformably basement bounding terrains, and (4) are involved in a limited number of low-displacement normal faults that recorded a modest amount of extension ( |
| Databáze: | OpenAIRE |
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