干旱区生态环境知识资源中心(Arid): Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib-Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry

Arid

DOI	10.3390/app112210524
	Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib-Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry
	Lasheen, El Saeed R.; Saleh, Gehad M.; Khaleal, Farrage M.; Alwetaishi, Mamdooh
通讯作者	Lasheen, ER (corresponding author), Al Azhar Univ, Fac Sci, Geol Dept, POB 11884, Cairo, Egypt.
来源期刊	APPLIED SCIENCES-BASEL
EISSN	2076-3417
出版年	2021
卷号	11 期号:22
英文摘要	This contribution deals with new geology, petrography, and bulk-rock/mineral chemistry of the poorly studied ultramafics of Wadi Ibib-Wadi Shani (WI-WS) district, South Eastern Desert, Egypt. These ultramafics are dismembered ophiolitic rocks that can be subdivided into serpentinites and serpentinized peridotites. Primary minerals such as olivine and pyroxene are absent in serpentinites, but relics of them occur in serpentinized peridotites. Pseudomorph after olivine is indicated by common hourglass textures with less mesh, whilst schistose bastites reflect a pyroxene pseudomorph. Chromite can be subdivided into Cr-spinel and Al-spinel. Cr-spinel ranges from chromite to magnesochromite in composition, whereas Al-spinel belongs to the spinel field. Cr-spinel includes YCr (Cr/(Cr+Al+Fe+3), YAl (Al/(Al+Cr+Fe+3), and YFe+3 (Fe+3/(Fe+3+Al+Cr), similar to forearc peridotite, whilst Al-spinel is more similar to abyssal peridotite, and may be formed during inanition of subduction processes in proto forearc environments. The main secondary minerals are tremolite, talc, and chlorite-which is subdivided into pycnochlorite and diabantite-and their temperature ranges from 174 to 224 & DEG;C. The examined rocks had undergone high partial melting degrees (> 25%), as indicated by the Cr# of their unaltered cores (Cr-spinel, > 0.6), whole rocks (Al2O3, SiO2, CaO, and MgO), trace and REEs, depleted Na2O, Al2O3, and Cr2O3 of clinopyroxene, and high forsterite content ((Fo = 100 Mg/Mg + Fe), av. 95.23 mol%), consistent with forearc settings.
英文关键词	serpentinization element mobility partial melting forearc affinity
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000723383700001
WOS关键词	SPINEL OXYGEN GEOBAROMETER ; CHROMIAN SPINEL ; ORTHO-PYROXENE ; TECTONIC SIGNIFICANCE ; OPHIOLITE COMPLEX ; PROCESSES BENEATH ; NUBIAN SHIELD ; SERPENTINITES ; PERIDOTITES ; GEOCHEMISTRY
WOS类目	Chemistry, Multidisciplinary ; Engineering, Multidisciplinary ; Materials Science, Multidisciplinary ; Physics, Applied
WOS研究方向	Chemistry ; Engineering ; Materials Science ; Physics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/373778
作者单位	[Lasheen, El Saeed R.] Al Azhar Univ, Fac Sci, Geol Dept, POB 11884, Cairo, Egypt; [Saleh, Gehad M.; Khaleal, Farrage M.] Nucl Mat Author, POB 530, Cairo, Egypt; [Alwetaishi, Mamdooh] Taif Univ, Coll Engn, Dept Civil Engn, POB 11099, At Taif 21944, Saudi Arabia
推荐引用方式 GB/T 7714	Lasheen, El Saeed R.,Saleh, Gehad M.,Khaleal, Farrage M.,et al. Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib-Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry[J],2021,11(22).
APA	Lasheen, El Saeed R.,Saleh, Gehad M.,Khaleal, Farrage M.,&Alwetaishi, Mamdooh.(2021).Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib-Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry.APPLIED SCIENCES-BASEL,11(22).
MLA	Lasheen, El Saeed R.,et al."Petrogenesis of Neoproterozoic Ultramafic Rocks, Wadi Ibib-Wadi Shani, South Eastern Desert, Egypt: Constraints from Whole Rock and Mineral Chemistry".APPLIED SCIENCES-BASEL 11.22(2021).