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DOI | 10.1016/S0301-9268(01)00176-0 |
Structural geology, single zircon ages and fluid inclusion studies of the Meatiq metamorphic core complex: Implications for Neoproterozoic tectonics in the Eastern Desert of Egypt | |
Loizenbauer, J; Wallbrecher, E; Fritz, H; Neumayr, P; Khudeir, AA; Kloetzli, U | |
通讯作者 | Loizenbauer, J |
来源期刊 | PRECAMBRIAN RESEARCH
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ISSN | 0301-9268 |
出版年 | 2001 |
卷号 | 110期号:1-4页码:357-383 |
英文摘要 | The Meatiq metamorphic core complex (MMCC) formed during the Precambrian as a result of multiple deformation and metamorphism in the Eastern Desert of Egypt. Structural, geochronologic, and fluid inclusion microthermometric analyses reveal a long formation/deformation history for the MMCC. This started with the break-up of Rodinia at ca. 800 Ma and continued until Pan-African collision at ca. 580 Ma. Between 800-780 Ma, rifting continued into sea floor spreading and oceanic crust formation. Synchronously, the Um Ba ’ anib granite intruded into an approximately 1.14 Ga old crust comprising migmatic amphibolites. Rifting was accompanied by the deposition of quartz- and mica-rich sediments. Between 660 Ma and 620 Ma, convergence between East and West Gondwanaland caused burial of sediments to a crustal depth of approximately 20 km and intrusion of calc-alkaline rocks. Subsequently, the meta-sediments were thrust across the Um Ba ’ anib granitoid. Deformation of both rock units took place under amphibolite-facies metamorphic conditions. Fluid inclusions with moderate density provide evidence for the retrograde stage of this metamorphic event. Continued oblique convergence between East and West Gondwanaland resulted in a transpressional regime with displacement partition. While nappe stacking continued in foreland domains, the MMCC was exhumed to a depth of 12-15 km in hinterland domains. Extension-related granitoids were emplaced between 620 and 580 Ma. Microthermometric analyses of fluid inclusions suggest a crustal depth of approximately 10-12 km for the transpressional event. Rapid exhumation was accompanied by detachment of the cover nappes and emplacement of syn-tectonic intrusions, which caused local contact metamorphism. Low-density fluid inclusions document high-T, low-P conditions for the contact metamorphism. The final stage of exhumation took place under brittle/ductile conditions at a crustal depth of approximately 3-6 km indicated by water-rich fluid inclusions. The age of this event is constrained by the intrusion of the late- to post-tectonic Arieki adamellite at approximately 580 Ma. (C) 2001 Elsevier Science B.V. All rights reserved. |
英文关键词 | Egypt exhumation fluid inclusions metamorphic core complex Pan-African orogen Rodinia break-up |
类型 | Article |
语种 | 英语 |
国家 | Austria ; Australia ; Egypt |
收录类别 | SCI-E |
WOS记录号 | WOS:000169979600018 |
WOS关键词 | ARABIAN-NUBIAN SHIELD ; PAPUA-NEW-GUINEA ; RED-SEA HILLS ; REGIONAL METAMORPHISM ; SHEAR ZONE ; OBLIQUE CONVERGENCE ; MASS-SPECTROMETRY ; DETACHMENT FAULTS ; CONTINENTAL-CRUST ; NAKASIB SUTURE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
来源机构 | University of Western Australia |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/141655 |
作者单位 | (1)Graz Univ, Dept Geol & Palaeontol, A-8010 Graz, Austria;(2)Univ Western Australia, Dept Geol & Geophys, Ctr Global Metallogeny, Crawley, WA 6009, Australia;(3)Assiut Univ, Dept Geol, Assiut 71516, Egypt;(4)Univ Vienna, Inst Geol, Lab Geochron, A-1010 Vienna, Austria |
推荐引用方式 GB/T 7714 | Loizenbauer, J,Wallbrecher, E,Fritz, H,et al. Structural geology, single zircon ages and fluid inclusion studies of the Meatiq metamorphic core complex: Implications for Neoproterozoic tectonics in the Eastern Desert of Egypt[J]. University of Western Australia,2001,110(1-4):357-383. |
APA | Loizenbauer, J,Wallbrecher, E,Fritz, H,Neumayr, P,Khudeir, AA,&Kloetzli, U.(2001).Structural geology, single zircon ages and fluid inclusion studies of the Meatiq metamorphic core complex: Implications for Neoproterozoic tectonics in the Eastern Desert of Egypt.PRECAMBRIAN RESEARCH,110(1-4),357-383. |
MLA | Loizenbauer, J,et al."Structural geology, single zircon ages and fluid inclusion studies of the Meatiq metamorphic core complex: Implications for Neoproterozoic tectonics in the Eastern Desert of Egypt".PRECAMBRIAN RESEARCH 110.1-4(2001):357-383. |
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