干旱区生态环境知识资源中心(Arid): Metasomatised serpentinite at the contact with anorogenic granite from the Neoproterozoic ophiolites in the Eastern Desert of Egypt

Arid

DOI	10.1127/ejm/2019/0031-2889
	Metasomatised serpentinite at the contact with anorogenic granite from the Neoproterozoic ophiolites in the Eastern Desert of Egypt
	Surour, Adel A.
通讯作者	Surour, AA (corresponding author), Cairo Univ, Fac Sci, Dept Geol, Giza 12613, Egypt.
来源期刊	EUROPEAN JOURNAL OF MINERALOGY
ISSN	0935-1221
EISSN	1617-4011
出版年	2019
卷号	31 期号:5-6 页码:963-972
英文摘要	The ophiolitic serpentinites of Neoproterozoic age in the Eastern Desert of Egypt show different types of contact against the country rocks. At the Fawakhir and Gabal Ghadir localities, the contact with the anorogenic granites is distinctly intrusive, with the formation of a limited-scale thermal aureole (up to similar to 3.15 and similar to 5.30 m at the two localities, respectively). The metasomatic alterations of the serpentinites caused by flow of hot fluids from the granite led to the formation of meta-ultramafic rocks with abundant dolomite, talc and free silica displaying proximal and distal varieties with respect to the intrusive granite. Combined field, petrographic, whole-rock and microanalytical data help to construct phase equilibria and mineral stabilities along the serpentinite-granite interface based on the mu SiO2 and X-CO2 variables. Phase diagrams for the thermal assemblages at the Ghadir and Fawakhir aureoles were constructed assuming a pressure of 1-3 kbar. The replacement of antigorite by talc becomes more independent on temperature at X-CO2 <= 0.2 and the crystallization of dolomite and calcite predominates in the proximal varieties. The upper stability limit of antigorite lies at similar to 425 degrees C and similar to 500 degrees C at 1 and 3 kbar, respectively. Thus, the granites were emplaced into shallow levels so that they were not able to dehydrate the serpentinites at the two studied localities. Accordingly, the formation of forsterite was not possible at the investigated contact aureoles as the condition to form metamorphic olivine (0.05 < X-CO2 < 0.55) was not attained.
英文关键词	serpentinite Eastern Desert Egypt diffusion metasomatism thermal aureole ultramafic phase diagram
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000505169400008
WOS关键词	PAN-AFRICAN SERPENTINITES ; ARABIAN-NUBIAN SHIELD ; ANTIGORITE ; METAMORPHISM ; OLIVINE ; ORIGIN ; GEOCHEMISTRY ; CONSTRAINTS ; EVOLUTION ; MAGNESITE
WOS类目	Mineralogy
WOS研究方向	Mineralogy
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/369630
作者单位	[Surour, Adel A.] Cairo Univ, Fac Sci, Dept Geol, Giza 12613, Egypt
推荐引用方式 GB/T 7714	Surour, Adel A.. Metasomatised serpentinite at the contact with anorogenic granite from the Neoproterozoic ophiolites in the Eastern Desert of Egypt[J],2019,31(5-6):963-972.
APA	Surour, Adel A..(2019).Metasomatised serpentinite at the contact with anorogenic granite from the Neoproterozoic ophiolites in the Eastern Desert of Egypt.EUROPEAN JOURNAL OF MINERALOGY,31(5-6),963-972.
MLA	Surour, Adel A.."Metasomatised serpentinite at the contact with anorogenic granite from the Neoproterozoic ophiolites in the Eastern Desert of Egypt".EUROPEAN JOURNAL OF MINERALOGY 31.5-6(2019):963-972.

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