干旱区生态环境知识资源中心(Arid): Petrogenesis and tectonic evolution of syn-to late granitoid rocks from Um Taghir NE Egyptian Nubian Shield Desert of Egypt: subduction to post-collision magmatism

Arid

DOI	10.1007/s12517-021-08864-9
	Petrogenesis and tectonic evolution of syn-to late granitoid rocks from Um Taghir NE Egyptian Nubian Shield Desert of Egypt: subduction to post-collision magmatism
	Asran, Asran M.; Amron, Taha M.; Hassan, Tharwat M.
通讯作者	Asran, AM (corresponding author), Sohag Univ, Fac Sci, Geol Dept, Sohag, Egypt.
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2021
卷号	14 期号:24
英文摘要	The Pan-African rocks of Urn Taghir area encompass metavolcanics, synorogenic granites, Dokhan Volcanics, younger gabbros, post-collision granites, and they are cross-cut by dikes. The current granitoid rocks comprise older weakly deformed tonalite-granodiorites intruded by late tectonic undeformed granite including monzo-syenogranites and alkali feldspar granites. The weakly deformed tonalite-granodiorite is characterized by a restricted range of SiO2 (65.78-69.43%) with reasonable enrichment in the LILE (Ba, Rb, and K2O), small negative Nb anomaly, and low Rb/Sr ratio which is the distinguishing of most of the synorogenic and subducted I-type granitoids in the Egyptian Nubian Shield (ANS). It is supposed that tonalitegranodiorite was formed by fractional crystallization of the Abu Furad metagabbro-diorite which is designated by their more or less lined trend on variation diagrams and their elements contents are ascribed to fractional crystallization of ferromagnesian minerals and feldspars. The monzo-syenogranites and alkali feldspar granites show SiO2 ranges of 71.86-75.88% and 73.74-78.62%, respectively, formed through limited melting of the tonalite-granodiorite crust by rising of asthenosphere fluids with fractional crystallization of feldspars and amphibole. They are enhanced in LILE and Nb, formed in shallower depth, and categorized as A-type post-collision granite. On the basis of the geodynamic model, granite phases are consistent with the prevalent change from compressional toward post-collisional setting in the North Eastern Desert (NED). The monzosyenogranites were partially transformed into episyenitized rocks (episyenitized monzo-syenogranites) via desilicification, displaying SiO2 contents of 65.44-66.36%, where gains and losses in mass are generally minimal (7.52 and 8.98%, respectively) and most other elements are close to the isocon line. Both older- and younger-granite types are in harmony with their formation by fractional crystallization process and are dependable with the dominant transitional tectonic setting in NED.
英文关键词	Granites Geochemistry Mineral chemistry Tectonic setting Egypt Nubian Shield
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000730234800009
WOS关键词	A-TYPE GRANITES ; NORTH EASTERN DESERT ; PRECAMBRIAN CRUSTAL EVOLUTION ; VOLCANIC-ROCKS ; CALC-ALKALINE ; GEOCHEMICAL CHARACTERISTICS ; DOKHAN VOLCANICS ; ORIGIN ; AREA ; DISCRIMINATION
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/2XILL650/373990
作者单位	[Asran, Asran M.] Sohag Univ, Fac Sci, Geol Dept, Sohag, Egypt; [Amron, Taha M.; Hassan, Tharwat M.] South Valley Univ, Fac Sci, Geol Dept, Qena, Egypt
推荐引用方式 GB/T 7714	Asran, Asran M.,Amron, Taha M.,Hassan, Tharwat M.. Petrogenesis and tectonic evolution of syn-to late granitoid rocks from Um Taghir NE Egyptian Nubian Shield Desert of Egypt: subduction to post-collision magmatism[J],2021,14(24).
APA	Asran, Asran M.,Amron, Taha M.,&Hassan, Tharwat M..(2021).Petrogenesis and tectonic evolution of syn-to late granitoid rocks from Um Taghir NE Egyptian Nubian Shield Desert of Egypt: subduction to post-collision magmatism.ARABIAN JOURNAL OF GEOSCIENCES,14(24).
MLA	Asran, Asran M.,et al."Petrogenesis and tectonic evolution of syn-to late granitoid rocks from Um Taghir NE Egyptian Nubian Shield Desert of Egypt: subduction to post-collision magmatism".ARABIAN JOURNAL OF GEOSCIENCES 14.24(2021).