Arid
DOI10.1016/j.gr.2015.04.009
Time constraints on deformation of the Ajjaj branch of one of the largest Proterozoic shear zones on Earth: The Najd Fault System
Hassan, M.1,2,5; Stuewe, K.1; Abu-Alam, T. S.3,4,5; Kloetzli, U.6; Tiepolo, M.7
通讯作者Hassan, M.
来源期刊GONDWANA RESEARCH
ISSN1342-937X
EISSN1878-0571
出版年2016
卷号34页码:346-362
英文摘要

In active tectonic regions, shear zones play an important role in re-configuring the structure of the lithosphere. One of the largest shear zones on Earth is the Najd Fault System of the Arabian-Nubian Shield. The main active phase of this shear zone was during the last stages of the Pan-African Orogeny (ca. 630-540 Ma). Six samples of intrusive rocks that were emplaced into the shear zone at different stages during its active phase are used to illustrate the progressive evolution of the Ajjaj shear zone. A sample of coarse-grained diorite, with an intercept U-Pb zircon age of 696 6 Ma, shows very weak deformation. Two samples from deformed granodiorite-tonalite intrusions at the border of the Ajjaj shear zone show conspicuous degrees of deformation, and define two U-Pb clusters of concordia ages at 747 +/- 12 Ma-668 +/- 8 Ma and 742 +/- 5 Ma-702 +/- 12 Ma. Two samples of granites show mylonitic foliation with flattened quartz and biotite parallel to the trend of the shear zone. These samples yield U-Pb ages of 601 +/- 3 Ma-584 +/- 3 Ma. Another granite sample is undeformed and shows crosscutting relations with the shear foliation of the Ajjaj shear zone. It yields a concordia age of 581 +/- 4 Ma. The metamorphic rocks of the Hamadat complex host the Ajjaj shear zone, and have been useful in determining the metamorphic P-T conditions attending the activity of the shear zone. The peak metamorphism of the Hamadat Complex is 505-700 degrees C at two ranges of pressure 8-11 and 14.5 +/- 2 lobar. New data confine the activation of the Ajjaj shear zone in a limited period of time between 604 Ma and 581 Ma and the operation at different crustal levels with a maximum depth of 58 km. (C) 2015 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.


英文关键词U-Pb Zircon Deformation P-T condition Ajjaj shear zone Arabian-Nubian Shield
类型Article
语种英语
国家Austria ; Egypt ; Norway ; Italy
收录类别SCI-E
WOS记录号WOS:000384702600023
WOS关键词ARABIAN-NUBIAN SHIELD ; CORE COMPLEX EXHUMATION ; PB ZIRCON GEOCHRONOLOGY ; CENTRAL EASTERN DESERT ; MC-ICP-MS ; SAUDI-ARABIA ; GEOCHEMICAL CONSTRAINTS ; METAMORPHIC ROCKS ; AFRICAN OROGEN ; TRACE-ELEMENT
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/193335
作者单位1.Graz Univ, Inst Erdwissensch, Univ Pl 2, A-8010 Graz, Austria;
2.Suez Canal Univ, Fac Sci, Dept Geol, Ismailia 41522, Egypt;
3.Norwegian Polar Res Inst, Hjalmar Johansens Gt 14, NO-9296 Tromso, Norway;
4.Tanta Univ, Fac Sci, Dept Geol, Tanta, Egypt;
5.Egyptian Inst Geodynam, Cairo, Egypt;
6.Univ Vienna, Dept Lithospher Res, Althanstr 14, A-1090 Vienna, Austria;
7.UOS Pavia, CNR Ist Geosci & Georisorse, Via Ferrata 1, I-27100 Pavia, Italy
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Hassan, M.,Stuewe, K.,Abu-Alam, T. S.,et al. Time constraints on deformation of the Ajjaj branch of one of the largest Proterozoic shear zones on Earth: The Najd Fault System[J],2016,34:346-362.
APA Hassan, M.,Stuewe, K.,Abu-Alam, T. S.,Kloetzli, U.,&Tiepolo, M..(2016).Time constraints on deformation of the Ajjaj branch of one of the largest Proterozoic shear zones on Earth: The Najd Fault System.GONDWANA RESEARCH,34,346-362.
MLA Hassan, M.,et al."Time constraints on deformation of the Ajjaj branch of one of the largest Proterozoic shear zones on Earth: The Najd Fault System".GONDWANA RESEARCH 34(2016):346-362.
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