干旱区生态环境知识资源中心(Arid): Mineralogical and geochemical characteristics of gold-hosted alteration zones in the Neoproterozoic arc metavolcanics at the Jabal Umm Watirah area, southwestern Saudi Arabia

Arid

DOI	10.1007/s12517-021-07050-1
	Mineralogical and geochemical characteristics of gold-hosted alteration zones in the Neoproterozoic arc metavolcanics at the Jabal Umm Watirah area, southwestern Saudi Arabia
	Surour, Adel A.; Harbi, Hesham M.; Al-Sulbi, Ismail
通讯作者	Surour, AA (corresponding author), Galala Univ, Fac Sci, Petr & Min Geol Program, New Galala City 43511, Egypt. ; Surour, AA (corresponding author), Cairo Univ, Fac Sci, Dept Geol, Giza 12613, Egypt.
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2021
卷号	14 期号:8
英文摘要	The paper presents new insights to gold mineralization at the Jabal Umm Watirah (JUW) area in western Saudi Arabia using surface and sub-surface information from field, mineralogical, and geochemical studies. Host rocks are Neoproterozoic serpentinites and arcmeta-andesite. Gold in serpentinites is enriched in listwaenite that results from silica and CO2 metasomatism. In the meta-andesite, prominent NW-SE alteration zones follow the Najd fault system (NFS) along the Ruwah fault zone (RFZ). These alterations are sulfide-rich and show sericitization, chloritization, silicification, and hematitization. The auriferous pyrite-rich listwaenite contains relict of Cr-spinel of the ophiolitic serpentinite precursor. Anomalous gold up to 10 g/t in listwaenite is encountered in one borehole whereas the rest assay up to 0.27 g/t with the exception of silicified serpentinite and quartz-carbonate rocks with up to 0.59 and 0.57 g/t gold, respectively. Hydrothermally altered arc meta-andesite contains up to similar to 25% sulfides (mostly pyrite, arsenopyrite, and chalcopyrite) with up to 1.62 wt% As2O5 and up to similar to 21 g/t gold. The results indicate that arsenic is a pathfinder for the studied gold mineralization. On the other hand, fresh meta-andesite is very poor in gold, up to 0.05 g/t only. Remobilized visible gold ore can be seen in some quartz veins and stringers with 150-170 mu m wide gold along fractures. Gold enrichment is confirmed in the meta-andesite from boreholes up to similar to 250 m deep that are dug beneath ancient workings and dumps at the two sectors in the JUW prospect. Gold mineralization in the JUW prospect is structurally controlled orogenic gold mineralization because of the following reasons: (1) proximity to the major first order structure, (2) host rocks are metamorphosed in the greenschist facies conditions, and (3) listwaenitization by carbonic and silicic metasomatism of the ophiolitic serpentinite.
英文关键词	Listwaenitized ophiolitic serpentinite Arc metavolcanics Alteration zones Gold enrichment Structural controls Orogenic style
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000641458500005
WOS关键词	CENTRAL EASTERN DESERT ; NUGRUS SHEAR ZONE ; NAJD FAULT SYSTEM ; OROGENIC GOLD ; CORE COMPLEX ; CHEMICAL CLASSIFICATION ; PAN-AFRICAN ; EGYPT ; SHIELD ; TRANSPRESSION
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/2XILL650/349566
作者单位	[Surour, Adel A.] Galala Univ, Fac Sci, Petr & Min Geol Program, New Galala City 43511, Egypt; [Surour, Adel A.] Cairo Univ, Fac Sci, Dept Geol, Giza 12613, Egypt; [Harbi, Hesham M.] King Abdnla7i7 Univ, Fac Earth Sci, Dept Mineral Resources & Rocks, BO Box 80206, Jeddah 21589, Saudi Arabia; [Al-Sulbi, Ismail] Saudi Arabian Min Co Maaden, Jeddah, Saudi Arabia
推荐引用方式 GB/T 7714	Surour, Adel A.,Harbi, Hesham M.,Al-Sulbi, Ismail. Mineralogical and geochemical characteristics of gold-hosted alteration zones in the Neoproterozoic arc metavolcanics at the Jabal Umm Watirah area, southwestern Saudi Arabia[J],2021,14(8).
APA	Surour, Adel A.,Harbi, Hesham M.,&Al-Sulbi, Ismail.(2021).Mineralogical and geochemical characteristics of gold-hosted alteration zones in the Neoproterozoic arc metavolcanics at the Jabal Umm Watirah area, southwestern Saudi Arabia.ARABIAN JOURNAL OF GEOSCIENCES,14(8).
MLA	Surour, Adel A.,et al."Mineralogical and geochemical characteristics of gold-hosted alteration zones in the Neoproterozoic arc metavolcanics at the Jabal Umm Watirah area, southwestern Saudi Arabia".ARABIAN JOURNAL OF GEOSCIENCES 14.8(2021).