干旱区生态环境知识资源中心(Arid): Petrogenesis of the late Tonian arc-related Um Balad gabbro-diorite complex (Egypt) and insight into its spatially related orogenic gold mineralization

Arid

DOI	10.1080/00206814.2022.2034057
	Petrogenesis of the late Tonian arc-related Um Balad gabbro-diorite complex (Egypt) and insight into its spatially related orogenic gold mineralization
	Abd El-Rahman, Yasser; Seifert, Thomas; Schulz, Bernhard; Hofmann, Mandy; Gaertner, Andreas; Linnemann, Ulf; Said, Amir
通讯作者	Abd El-Rahman, Y (corresponding author)，Cairo Univ, Fac Sci, Geol Dept, Giza 12613, Egypt.
来源期刊	INTERNATIONAL GEOLOGY REVIEW
ISSN	0020-6814
EISSN	1938-2839
出版年	2022-02
英文摘要	The gabbro-diorite complex of the Um Balad prospect hosts lode gold mineralization. The complex is dated at 723 +/- 4 Ma using the LA-ICP-MS U-Pb zircon method and is correlated with the late Tonian-early Cryogenian subduction-related magmatic stage during the evolution of the Arabian-Nubian Shield. The gabbro-diorite complex evolved through the crystallization of a calc-alkaline magma and the subduction signature of this magma is verified by primitive mantle-normalized trace element patterns that show enrichment in large ion lithophile elements, U, and Th relative to high field strength elements as well as negative Nb and Ti anomalies. The high La/Yb-cn (3.1-9.4) and Ta/Yb (0.12-0.41) ratios are consistent with a continental arc rather than an oceanic arc system. Amphibole chemistry indicates that this complex might have crystallized under a moderately oxidizing condition from a hydrous magma (>6 wt% water content) at temperature and pressure estimates of about 800 degrees C and 3 kbar, respectively. Gold mineralization in the Um Balad prospect is confined to structurally controlled massive quartz +/- carbonate veins and surrounding alteration halos. Alteration in the prospect is represented by localized sericitization and carbonation as well as pervasive chlorite-sericite alteration. The alteration halos are characterized by enrichment in K and Rb and depletion in Ca and Sr compared to their host rocks. The veins of the prospect are related to lower order extensional fractures associated with the regional first order transpressional Najd Fault System. The high Fe contents of the gabbro-diorite complex represent a suitable chemical trap for gold through sulfidation of the host rocks. Supergene alteration resulted in the formation of goethite in association with atacamite and chrysocolla. Free mill gold is associated with these supergene phases, which were deposited in near neutral to slightly alkaline conditions.
英文关键词	Arabian-nubian shield continental arc gabbro-diorite complex orogenic lode gold supergene alteration
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000752275100001
WOS关键词	CENTRAL EASTERN DESERT ; ARABIAN-NUBIAN SHIELD ; PRIMARY GEOCHEMICAL DISPERSION ; MASSIVE SULFIDE DEPOSIT ; SHEAR-ZONE ; HYDROTHERMAL ALTERATION ; YILGARN CRATON ; TRACE-ELEMENT ; NEOPROTEROZOIC GRANITOIDS ; ISOTOPIC CONSTRAINTS
WOS类目	Geology
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/2XILL650/377335
作者单位	[Abd El-Rahman, Yasser; Said, Amir] Cairo Univ, Fac Sci, Geol Dept, Giza 12613, Egypt; [Seifert, Thomas; Schulz, Bernhard] Tech Univ Bergakad Freiberg, Inst Mineral, Div Econ Geol & Petrol, Freiberg, Germany; [Hofmann, Mandy; Gaertner, Andreas; Linnemann, Ulf] Senckenberg Nat Hist Sammlungen Dresden, GeoPlasmaLab, Museum Mineral & Geol, Dresden, Germany
推荐引用方式 GB/T 7714	Abd El-Rahman, Yasser,Seifert, Thomas,Schulz, Bernhard,et al. Petrogenesis of the late Tonian arc-related Um Balad gabbro-diorite complex (Egypt) and insight into its spatially related orogenic gold mineralization[J],2022.
APA	Abd El-Rahman, Yasser.,Seifert, Thomas.,Schulz, Bernhard.,Hofmann, Mandy.,Gaertner, Andreas.,...&Said, Amir.(2022).Petrogenesis of the late Tonian arc-related Um Balad gabbro-diorite complex (Egypt) and insight into its spatially related orogenic gold mineralization.INTERNATIONAL GEOLOGY REVIEW.
MLA	Abd El-Rahman, Yasser,et al."Petrogenesis of the late Tonian arc-related Um Balad gabbro-diorite complex (Egypt) and insight into its spatially related orogenic gold mineralization".INTERNATIONAL GEOLOGY REVIEW (2022).