A metamorphic devolatilization model for the granitoid-hosted Wulong lode gold deposit, Liaodong Peninsula, Eastern North China Craton: Evidence from geology, fluid inclusions, and O-Sr-Li isotopes

Liu, Shuaijie1,2; Chen, Bin1; Zheng, Jiahao1,3; Bao, Chuang4; Zhao, Guochun2,5

2023-07-01

10.1016/j.oregeorev.2023.105515

ORE GEOLOGY REVIEWS   影响因子和分区

0169-1368

1872-7360

The genesis of the gold deposits in the eastern North China Craton (NCC) has long been disputed. Many would relate the gold mineralization to magmatism. The Wulong in the Liaodong Peninsula is a classic example in the eastern NCC and was considered to be of magmatic hydrothermal origin previously. Nevertheless, we propose a metamorphic devolatilization model to explain its genesis based on geological, fluid inclusion and O-Sr-Li iso-topic study. The geological proliles, temperatures, salinities, and O isotopes of the ore-forming fluids at Wulong show no spatial variations over a 600 m vertical depth interval. These evidence convincingly prove its vertically extensive feature, which is similar to orogenic gold deposits, but different from magmatic hydrothermal systems. The initial Sr isotopes of the ore-forming fluids (0.71435 to 0.71578) fall into the range of metabasalts from the Liaohe Group (the Paleoproterozoic basement), indicating that metabasalts are the probable sources. Lithium and its isotopic modelling further suggest that metamorphic devolatilization of metabasalts (with chain silicates Ch, phyllosilicates Ph, and quartz Qtz as endmembers; Ch, Li es 5 ppm, 87Li es 8%0; Ph, Li es 63 ppm, 87Li es - 1%0; Qtz, Li es 10 ppm, 87Li es 30%0) could account for the Li concentrations (5-41 ppm) and 87Li value of the fluid (21.4%0) of the Wulong gold deposit. Rayleigh fractionation in a closed system led to large Li isotopic variation of the ore-forming fluids (21.4 to 11.0%0). The metamorphic devolatilization model based on the vertically extensive feature, Sr isotopic constraint and Li isotopic modelling is in striking contrast with previous qualitative isotopic studies that support a magmatic hydrothermal origin for the Wulong and other granitoid-hosted gold deposits in the eastern NCC. Integrated with geological characteristics and radiogenic isotopes, this study here shows that Li isotopes can provide new constraints on the genesis of orogenic gold deposits.

Wulong lode gold deposit Vertically extensive Li isotopes Metamorphic devolatilization Eastern North China Craton

SCI ; EI

英语

第一 ; 通讯

National Key Research and Development Program of China[2018YFC0603801]

Geology ; Mineralogy ; Mining & Mineral Processing

Geology ; Mineralogy ; Mining & Mineral Processing

WOS:001011604400001

ELSEVIER

20232614323553

Deposits ; Fluid inclusion ; Geology ; Gold deposits ; Isotopes ; Lithium ; Ores ; Silicates

Geology:481.1 ; Mineralogy:482 ; Heavy Metal Mines:504.3 ; Lithium and Alloys:542.4 ; Precious Metals:547.1 ; Alkali Metals:549.1 ; Fluid Flow:631

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen 518055, Guangdong, Peoples R China
2.Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China
3.Fuzhou Univ, Zijin Sch Geol & Min, Fuzhou 350108, Peoples R China
4.Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang 524088, Peoples R China
5.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China

Liu, Shuaijie,Chen, Bin,Zheng, Jiahao,et al. A metamorphic devolatilization model for the granitoid-hosted Wulong lode gold deposit, Liaodong Peninsula, Eastern North China Craton: Evidence from geology, fluid inclusions, and O-Sr-Li isotopes[J]. ORE GEOLOGY REVIEWS,2023,158.

Liu, Shuaijie,Chen, Bin,Zheng, Jiahao,Bao, Chuang,&Zhao, Guochun.(2023).A metamorphic devolatilization model for the granitoid-hosted Wulong lode gold deposit, Liaodong Peninsula, Eastern North China Craton: Evidence from geology, fluid inclusions, and O-Sr-Li isotopes.ORE GEOLOGY REVIEWS,158.

Liu, Shuaijie,et al."A metamorphic devolatilization model for the granitoid-hosted Wulong lode gold deposit, Liaodong Peninsula, Eastern North China Craton: Evidence from geology, fluid inclusions, and O-Sr-Li isotopes".ORE GEOLOGY REVIEWS 158(2023).