Geological and geochemical constraints on the genesis of the Huachanggou gold deposit, western Qinling region, Central China

Liu, Chonghao, Liu, Jiajun, Carranza, Emmanuel John M., Yang, Longbo, Wang, Jiangping, Zhai, Degao, Wang, Yinhong, Wu, Jie, and Dai, Hongzhang (2016) Geological and geochemical constraints on the genesis of the Huachanggou gold deposit, western Qinling region, Central China. Ore Geology Reviews, 73 (2). pp. 354-373.

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Abstract

The Huachanggou gold deposit is located in Lueyang County, Shaanxi Province, central China; it is situated in the Mian–Lue sutural zone in the western Qinling Orogen and controlled by a WNW-striking ductile shear zone. The ore deposit is developed in spilite, limestone and phyllite in the Middle–Lower Devonian Sanhekou Group, and the wall rocks show evidence of deformation. Pyrite is the main gold-bearing mineral, and the native gold is either visible or microscopic.

The Huachanggou gold deposit is considered to be an orogenic gold deposit controlled by a ductile shear zone related to the Indosinian Qinling orogenic event. The ores show a strong enrichment in Au, Ag and As but exhibit a simple assemblage of Au and Ag that are strongly correlated together. Gold was deposited from a moderate to low salinity, salt solution–CO2 hydrothermal fluid at medium temperature. Variations in S, Pb, C, and O isotopic composition indicate that the sulfur was derived from the reduction of seawater sulfate in the wall rocks; the lead was derived mainly from the wall rocks; the carbon was derived from the dissolution of marine carbonate. The variations in H and O isotopic composition indicate that the ore-forming fluids were derived originally from metamorphic fluid with meteoric water mixing in later stages. Au migrated mainly in the form of Au(HS)2− to form the deposit. Boiling of the fluid triggered the precipitation of the metal sulfides that contain the gold.

Item ID: 41371
Item Type: Article (Research - C1)
ISSN: 1872-7360
Keywords: Huachanggou gold deposit; Qinling orogen; geology; geochemistry; ore genesis
Funders: National Natural Science Foundation of China (NNSFC), Major Basic Research Program of People's Republic of China, Specialized Research Fund for the Doctoral Program of Higher Education, China, China Geological Survey (CGS), Ministry of Education and the State Administration of Foreign Experts Affairs, China
Projects and Grants: NNSFC Grant No. 41030423, Major Basic Research Program of People's Republic of China Grant No. 2014CB440903, Specialized Research Fund for the Doctoral Program of Higher Education Grant No. 20130022110001, NNSFC Grant No. 41173062, NNSFC Grant No. 40972071, CGS Grant No. 1212011220924, CGS Grant No. 1212011120354, 111 Project No. B07011
Date Deposited: 10 Dec 2015 05:13
FoR Codes: 04 EARTH SCIENCES > 0402 Geochemistry > 040202 Inorganic Geochemistry @ 30%
04 EARTH SCIENCES > 0402 Geochemistry > 040203 Isotope Geochemistry @ 35%
04 EARTH SCIENCES > 0403 Geology > 040303 Geochronology @ 35%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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