Arid
DOI10.1016/j.lithos.2016.06.024
Geochemical signature variation of pre-, syn-, and post-shearing intrusives within the Najd Fault System of western Saudi Arabia
Hassan, M.1,2; Abu-Alam, T. S.1,3,4; Hauzenberger, C.1; Stuewe, K.1
通讯作者Hassan, M.
来源期刊LITHOS
ISSN0024-4937
EISSN1872-6143
出版年2016
卷号263页码:274-291
英文摘要

Late Precambrian intrusive rocks in the Arabian-Nubian Shield emplaced within and around the Najd Fault System of Saudi Arabia feature a great compositional diversity and a variety of degrees of deformation (i.e. pre-shearing deformed, sheared mylonitized, and post-shearing undeformed) that allows placing them into a relative time order. It is shown here that the degree of deformation is related to compositional variations where early, usually pre-shearing deformed rocks are of dioritic, tonalitic to granodioritic, and later, mainly post-shearing undeformed rocks are mostly of granitic composition. Correlation of the geochemical signature and time of emplacement is interpreted in terms of changes in the source region of the produced melts due to the change of the stress regime during the tectonic evolution of the Arabian-Nubian Shield. The magma of the pre-shearing rocks has tholeiitic and calc-alkaline affinity indicating island arc or continental arc affinity. In contrast, the syn-and post-shearing rocks are mainly potassium rich peraluminous granites which are typically associated with post-orogenic uplift and collapse. This variation in geochemical signature is interpreted to reflect the change of the tectonic regime from a compressional volcanic arc nature to extensional within-plate setting of the Arabian-Nubian Shield. Within the context of published geochronological data, this change is likely to have occurred around 605-580 Ma. (C) 2016 Elsevier B.V. All rights reserved.


英文关键词Najd Arabian-Nubian shield Geochemistry Plate tectonic Compressional Extensional Shearing Intrusive rocks
类型Article
语种英语
国家Austria ; Egypt ; Norway
收录类别SCI-E
WOS记录号WOS:000385325200016
WOS关键词CENTRAL EASTERN DESERT ; NUBIAN-SHIELD ; TECTONIC EVOLUTION ; CRUSTAL GROWTH ; U-PB ; NEOPROTEROZOIC GRANITOIDS ; ISOTOPIC CONSTRAINTS ; AFRICAN OROGEN ; KERAF SUTURE ; RING COMPLEX
WOS类目Geochemistry & Geophysics ; Mineralogy
WOS研究方向Geochemistry & Geophysics ; Mineralogy
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/194982
作者单位1.Karl Franzens Univ Graz, Inst Erdwissensch, Univ Pl 2, A-8010 Graz, Austria;
2.Suez Canal Univ, Fac Sci, Dept Geol, Ismailia, Egypt;
3.Tanta Univ, Fac Sci, Dept Geol, Tanta, Egypt;
4.Norwegian Polar Res Inst, Fram Ctr, N-9296 Tromso, Norway
推荐引用方式
GB/T 7714
Hassan, M.,Abu-Alam, T. S.,Hauzenberger, C.,et al. Geochemical signature variation of pre-, syn-, and post-shearing intrusives within the Najd Fault System of western Saudi Arabia[J],2016,263:274-291.
APA Hassan, M.,Abu-Alam, T. S.,Hauzenberger, C.,&Stuewe, K..(2016).Geochemical signature variation of pre-, syn-, and post-shearing intrusives within the Najd Fault System of western Saudi Arabia.LITHOS,263,274-291.
MLA Hassan, M.,et al."Geochemical signature variation of pre-, syn-, and post-shearing intrusives within the Najd Fault System of western Saudi Arabia".LITHOS 263(2016):274-291.
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