干旱区生态环境知识资源中心(Arid): Mineralogical and geochemical study of rodingites and associated serpentinized peridotite, Eastern Desert of Egypt, Arabian-Nubian Shield

Arid

DOI	10.1016/j.lithos.2020.105720
	Mineralogical and geochemical study of rodingites and associated serpentinized peridotite, Eastern Desert of Egypt, Arabian-Nubian Shield
	Mubarak, Heba S.; Azer, Mokhles K.; Surour, Adel A.; Moussa, Hilmy E.; Asimow, Paul D.; Kabesh, Mona M. L.
通讯作者	Azer, MK
来源期刊	LITHOS
ISSN	0024-4937
EISSN	1872-6143
出版年	2020
卷号	374
英文摘要	We studied rodingite and rodingite-like rocks within a serpentinized ultramafic sequence and ophiolitic melange at Urn Rashid, in the Eastern Desert of Egypt. The Um Rashid ophiolite is strongly deformed, metamorphosed, and altered by serpentinization, carbonatization, listvenitization, rodingitization and silicification. The textures, whole-rock chemistry, and composition of fresh primary mineral relics show that the serpentinite protoliths were strongly melt-depleted harzburgite and minor dunite, typical of a supra-subduction zone fore-arc setting. The light-colored rocks replacing gabbro are divided on the basis of field relations, mineral assemblages and geochemical characteristics into typical rodingite and rodingite-like rock. Typical rodingite, found as blocks with chlori tile blackwall rims within ophiolitic melange, contains garnet, vesuvianite, diopside and chlorite with minor prehnite and opaque minerals. Rodingite-like rock, found as dykes in serpentinite, consists of hercynite, preiswerkite, margarite, corundum, prehnite, ferropargasite, albite, andesine, clinozoisite and diaspore. Some rodingite-like rock samples preserve relict gabbroic minerals and texture, whereas typical rodingite is fully replaced. Rodingite is highly enriched in CaO, Fe2O3, MgO, and compatible trace elements, whereas rodingite-like rock is strongly enriched in Al2O3 and incompatible trace elements. Based on geochemistry and petrographic evidence, both types of rodingitic rocks likely developed from mafic protoliths in immediate proximity to serpentinite but were affected by interaction with different fluids, most likely at different times. Typical rodingite development likely accompanied serpentinization and shows mineral assemblages characteristic of low-Si, high-Ca fluid infiltration at about 300 degrees C. Rodingite-like rock, on the other hand, likely developed from seawater infiltration. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Arabian-Nubian Shield Rodingitization Carbonatization Garnet Vesuvianite Hercynite Margarite Preiswerkite
类型	Article
语种	英语
开放获取类型	Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000576647400003
WOS关键词	MID-ATLANTIC RIDGE ; FORE-ARC ; ABYSSAL PERIDOTITES ; SPINEL COMPOSITIONS ; ULTRAMAFIC ROCKS ; OPHIOLITE ; EVOLUTION ; PETROLOGY ; BENEATH ; ZONE
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/2XILL650/326707
作者单位	[Mubarak, Heba S.; Azer, Mokhles K.; Moussa, Hilmy E.] Natl Res Ctr, Geol Sci Dept, Cairo 12622, Egypt; [Surour, Adel A.; Kabesh, Mona M. L.] Cairo Univ, Fac Sci, Dept Geol, Giza 12613, Egypt; [Asimow, Paul D.] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
推荐引用方式 GB/T 7714	Mubarak, Heba S.,Azer, Mokhles K.,Surour, Adel A.,et al. Mineralogical and geochemical study of rodingites and associated serpentinized peridotite, Eastern Desert of Egypt, Arabian-Nubian Shield[J],2020,374.
APA	Mubarak, Heba S.,Azer, Mokhles K.,Surour, Adel A.,Moussa, Hilmy E.,Asimow, Paul D.,&Kabesh, Mona M. L..(2020).Mineralogical and geochemical study of rodingites and associated serpentinized peridotite, Eastern Desert of Egypt, Arabian-Nubian Shield.LITHOS,374.
MLA	Mubarak, Heba S.,et al."Mineralogical and geochemical study of rodingites and associated serpentinized peridotite, Eastern Desert of Egypt, Arabian-Nubian Shield".LITHOS 374(2020).