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DOI	10.1016/j.earscirev.2020.103273
	The Archean to Late-Paleozoic architecture of the Oulad Dlim Massif, the main Gondwanan indenter during the collision with Laurentia
	Bea F.; Montero P.; Haissen F.; Molina J.F.; Lodeiro F.G.; Mouttaqi A.; Kuiper Y.D.; Chaib M.
发表日期	2020
ISSN	00128252
卷号	208
英文摘要	The Oulad Dlim Massif, located west of the Archean part of the Reguibat Rise of the West African Craton, has an areal extent close to 36,000 km2. Despite its tectonic importance, as it may have been the main indenter during the late Paleozoic Laurentia-Gondwana collision that formed supercontinent Pangea, this region has remained unstudied for a long time. Based on previous research done by Spanish geologists before 1965, the pioneering work done by Rjimati and Zemmouri (2002 and personal communication) between 2000 and 2010, and new fieldwork conducted after 2010 in collaboration with Moroccan exploration geologists, we carried out a massif-wide study that includes sensitive high-resolution ion mass spectrometry (SHRIMP) zircon U–Pb geochronology, modern petrography, geochemistry, and isotope geology. Here we present these results and discuss their interpretation in the context of other circum-Atlantic orogens and terranes. The Oulad Dlim Massifs is composed of an Archean terrain divided by an NNE-SSW trending Ediacaran (Pan-African) intracontinental rift marked by a voluminous bimodal mafic-felsic magmatism, and a Silurian-Devonian belt in the west. The massif is affected by an intense shear deformation that likely marks its main assembly. Deformed and undeformed Silurian-Devonian granites indicate that such deformation was active at ≈420 Ma, declined at ≈410 Ma, and ended at ≈404 Ma. The whole massif is metamorphosed. The metamorphism is especially intense in the Ediacaran Adrar Suttuf Metamafic Complex, i.e., the rift-related mafic magmatic rocks, which have a crystallization age of 603 ± 1 Ma and probable metamorphic age of 570 Ma to 550 Ma. There is also evidence of a later thermal event, likely related to the formation of the Silurian-Devonian belt, that reset the Rb–Sr system of the Ediacaran leucogranites to ≈ 420 Ma and metamorphosed them in the greenschist facies. We have also found an enigmatic strip of Late Carboniferous rocks in the Silurian-Devonian belt, and evidence indicating that the latest structures and low-grade metamorphism affecting the Silurian-Devonian granites likely were of this age. Therefore, we suggest that off-shore and west of the Silurian-Devonian belt, underneath the Cenozoic cover and on the continental shelf there may be more evidence for Late Carboniferous deformation equivalent to the eastern North America Alleghanian Orogen, which, like this, would have resulted from the Laurentia-Gondwana collision during the Late Carboniferous. © 2020 Elsevier B.V.
关键词	Alleghanian Ediacaran rifting Granulites Reguibat Shield SHRIMP dating Silurian-Devonian West Africa
英文关键词	Carboniferous; collision zone; crystallization; Gondwana; Laurentia; Paleozoic; structural geology; tectonic evolution; tectonic setting
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203631
作者单位	Dept. Mineralogy and Petrology, University of Granada, Campus Fuentenueva18002, Spain; Dépt de Géologie, Faculté des Sciences Ben M'sik, Université Hassan 2, Casablanca, Morocco; Department of Geodynamics, University of Granada, Campus Fuentenueva18002, Spain; Office National des Hydrocarbures et des Mines, 5, avenue Moulay-Hassan, Rabat, Morocco; Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO 80401, United States
推荐引用方式 GB/T 7714	Bea F.,Montero P.,Haissen F.,et al. The Archean to Late-Paleozoic architecture of the Oulad Dlim Massif, the main Gondwanan indenter during the collision with Laurentia[J],2020,208.
APA	Bea F..,Montero P..,Haissen F..,Molina J.F..,Lodeiro F.G..,...&Chaib M..(2020).The Archean to Late-Paleozoic architecture of the Oulad Dlim Massif, the main Gondwanan indenter during the collision with Laurentia.Earth Science Reviews,208.
MLA	Bea F.,et al."The Archean to Late-Paleozoic architecture of the Oulad Dlim Massif, the main Gondwanan indenter during the collision with Laurentia".Earth Science Reviews 208(2020).