Arid
DOI10.1016/S0301-9268(02)00062-1
A late Neoproterozoic magmatic core complex in the Eastern Desert of Egypt: emplacement of granitoids in a wrench-tectonic setting
Breger, M; Bauernhofer, A; Pelz, K; Kloetzli, U; Fritz, H; Neumayr, P
通讯作者Fritz, H
来源期刊PRECAMBRIAN RESEARCH
ISSN0301-9268
出版年2002
卷号118期号:1-2页码:59-82
英文摘要

Core complexes within the Eastern Desert of Egypt evolved in the course of orogen-parallel extension during Neoproterozoic plate convergence. In the Sibai Core complex, more than 90% of the exposed surface consists of magmatic rocks. In this study four magmatic suites have been distinguished. They are geochemically characterised and their intrusion ages are determined using the Pb/Pb single zircon evaporation technique. Results show that all magmatic suites formed during Neoproterozoic tectonics. The oldest, calc-alkaline rocks of group (I) gave ages of 670-690 Ma and are related to subduction processes in an island-arc setting. Subsequent orogen-parallel extension was accompanied by the intrusion of group (II) and (III) granitoids yielding ages of 655 and 645 Ma, respectively. The younger, felsic, granites of group (IV) intruded along pre-existing structures and exhibit variable composition. We relate emplacement of various granitoids within the Sibai to progressively evolving structures. Group (I) represents the deep level of an island arc and exhibits nappe stacking structures related to oblique convergence in the late,Neoproterozoic. Group (II) granitoids have been emplaced at mid-crustal levels and portray transpression and orogen-parallel extrusion dynamics. Related structures are represented by an older set of sinistral shear zones. Granitoids of group (III) intruded upper crustal levels during exhumation of the Sibai Core complex. Their emplacement was controlled by the pull-apart regime of a younger set of sinistral shear zones and associated normal shear zones. Denudation due to ongoing orogen-parallel extension is evident from deposition of sediments within the adjacent intramontane Kareim molasse basin. The sediments were intruded by post-tectonic granitoids of group (IV). Close relations between core complex formation and ongoing magmatic activity define the Sibai as a magmatic core complex. (C) 2002 Published by Elsevier Science B.V.


英文关键词Egypt East African Orogen neoproterozoic exhumation core complexes granites
类型Article
语种英语
国家Austria ; Germany ; Australia
收录类别SCI-E
WOS记录号WOS:000178845400002
WOS关键词ARABIAN-NUBIAN SHIELD ; PRECAMBRIAN CRUSTAL EVOLUTION ; EXTENSIONAL COLLAPSE ; MASS-SPECTROMETRY ; MEATIQ DOME ; SUEZ RIFT ; BASEMENT ; SINAI ; OPHIOLITES ; ORIGIN
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/2XILL650/143628
作者单位(1)Graz Univ, Inst Geol & Palaeontol, A-8010 Graz, Austria;(2)Geoforschungszentrum Potsdam, Potsdam, Germany;(3)Univ Vienna, Inst Geol, Lab Geochronol, Vienna, Austria;(4)Univ Western Australia, Dept Geol & Geophys, Ctr Strateg Mineral Deposits, Nedlands, WA 6009, Australia
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Breger, M,Bauernhofer, A,Pelz, K,et al. A late Neoproterozoic magmatic core complex in the Eastern Desert of Egypt: emplacement of granitoids in a wrench-tectonic setting[J]. University of Western Australia,2002,118(1-2):59-82.
APA Breger, M,Bauernhofer, A,Pelz, K,Kloetzli, U,Fritz, H,&Neumayr, P.(2002).A late Neoproterozoic magmatic core complex in the Eastern Desert of Egypt: emplacement of granitoids in a wrench-tectonic setting.PRECAMBRIAN RESEARCH,118(1-2),59-82.
MLA Breger, M,et al."A late Neoproterozoic magmatic core complex in the Eastern Desert of Egypt: emplacement of granitoids in a wrench-tectonic setting".PRECAMBRIAN RESEARCH 118.1-2(2002):59-82.
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