干旱区生态环境知识资源中心(Arid): Trace elements and isotope data of the Um Garayat gold deposit, Wadi Allaqi district, Egypt

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DOI	10.1007/s00126-018-0807-3
	Trace elements and isotope data of the Um Garayat gold deposit, Wadi Allaqi district, Egypt
	Zoheir, Basem 1,2; Emam, Ashraf 3; Pitcairn, Iain K.4; Boskabadi, Arman 5; Lehaye, Yann 6; Cooper, Matthew J.7
通讯作者	Zoheir, Basem
来源期刊	MINERALIUM DEPOSITA
ISSN	0026-4598
EISSN	1432-1866
出版年	2019
卷号	54 期号:1 页码:101-116
英文摘要	Trace element composition of sulfides and O, C, Sr and S isotopic data are assessed to constrain the evolution and potential fluid and metal sources of the Um Garayat gold deposit. Ore microscopy and BSE investigations of quartz veins show blocky arsenopyrite and pyrite replaced in part by pyrrhotite, chalcopyrite, sphalerite, galena, and gersdorffite. Free-milling gold occurs commonly in close association with the late sulfides, and along fractures in pyrite. On the other hand, recrystallized pyrite is disseminated in host metavolcaniclastic/metasedimentary rocks that commonly contain carbonaceous material. In situ LA-ICP-MS analysis of sulfides shows the recrystallized pyrite enriched in most trace elements, while blocky pyrite contains only some traces of arsenic. Detected concentrations of gold (up to 17ppm) were only reported in arsenopyrite disseminated in quartz veins. The S-34 values of blocky pyrite and pyrrhotite in quartz veins define a narrow range (1.6 to 3.7 parts per thousand), suggesting a homogenous sulfur source which is consistent with the dominantly mafic host rocks. The recrystallized pyrite has a distinctive sulfur isotope composition (S-34 -9.3 to -10.6 parts per thousand), which is rather comparable to diagenetic sulfides. Hydrothermal carbonate in quartz veins and wallrock have nearly constant values of O-18 (10.5 to 11.9 parts per thousand) and C-13 (-4.2 to -5.5 parts per thousand). Based on constraints from mineral assemblages and chlorite thermometry, data of six samples indicate that carbonate precipitation occurred at similar to 280 degrees C from a homogenous hydrothermal fluid with O-18(H2O) 4.4 +/- 0.7 parts per thousand and C-13 =3.7 +/- 0.8 parts per thousand. Strontium isotope values of two samples (Sr-87/Sr-86 = 0.7024 and 0.7025) are similar to the initial Sr-87/Sr-86 ratios of island arc metabasalts (similar to 710Ma) in the South Eastern Desert. The generally homogenous sulfur, C, O, Sr isotope data are suggestive of metamorphogenic fluids, likely produced from dominantly mafic volcanic rocks at the greenschist-amphibolite facies transition.
英文关键词	Um Garayat gold deposit Wadi Allaqi South Eastern Desert of Egypt Isotope C O and Sr data of carbonate EPMA and LA-ICP-MS data of sulfides Ore genesis
类型	Article
语种	英语
国家	Egypt ; Germany ; Sweden ; USA ; Finland ; England
开放获取类型	Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000459434900008
WOS关键词	SOUTH-EASTERN DESERT ; HEIANI-SUTURE ; STRUCTURAL CONTROLS ; SULFIDE MINERALS ; FLUID EVOLUTION ; CARBON-ISOTOPE ; LANDSAT TM ; MINERALIZATION ; BELT ; AREA
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/2XILL650/217617
作者单位	1.Benha Univ, Dept Geol, Fac Sci, Banha 13518, Egypt; 2.Univ Kiel, Inst Geosci, Ludewig Meyn Str 10, D-24118 Kiel, Germany; 3.Aswan Univ, Dept Geol, Fac Sci, Aswan 81528, Egypt; 4.Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden; 5.Univ Texas Dallas, Dept Geol Sci, Dallas, TX USA; 6.Geol Survey Finland, Finland Isotope Geosci Lab, Espoo, Finland; 7.Univ Southampton, Natl Oceanog Ctr Southampton, Southampton, Hants, England
推荐引用方式 GB/T 7714	Zoheir, Basem,Emam, Ashraf,Pitcairn, Iain K.,et al. Trace elements and isotope data of the Um Garayat gold deposit, Wadi Allaqi district, Egypt[J],2019,54(1):101-116.
APA	Zoheir, Basem,Emam, Ashraf,Pitcairn, Iain K.,Boskabadi, Arman,Lehaye, Yann,&Cooper, Matthew J..(2019).Trace elements and isotope data of the Um Garayat gold deposit, Wadi Allaqi district, Egypt.MINERALIUM DEPOSITA,54(1),101-116.
MLA	Zoheir, Basem,et al."Trace elements and isotope data of the Um Garayat gold deposit, Wadi Allaqi district, Egypt".MINERALIUM DEPOSITA 54.1(2019):101-116.