南秦岭山阳—柞水矿集区夏家店金矿床微量-铂族元素地球化学特征及其对矿床成因的指示

doi:10.13278/j.cnki.jjuese.20200099

Abstract

Abstract: The Xiajiadian gold deposit, located in the South Qinling orogenic belt, is a large-scale gold deposit controlled by structure and strata. The ore is divided into three types: Breccia type, cataclastic type,and quartz vein type. The host rocks are mainly carbonaceous argillaceous slate, carbonaceous siliceous slate, siliceous rock and dolomite of the Cambrian Shuigoukou Formation, followed by breccia of the Devonian Xichahe Formation. In this paper, the content of trace elements and platinum group elements (PGE) of ores (brecciated carbonaceous siliceous slate, cataclastic silicified dolomite, cataclastic carbonaceous argillaceous slate,and quartz vein mineralized siliceous rock) and surrounding rocks (siliceous rock, silicified dolomite, and siliceous slate) in Xiajiadian gold deposit are determined, and then the source of ore-forming materials and the genesis of the deposit are discussed. The results show that: 1) Different types of ores and their surrounding rocks are highly similar, and they are rich in Sr, Ga, Zr and other elements; 2) The total amount of rare earth elements (REE) in different types of ores is higher than that in various types of surrounding rocks, but they have similar REE distribution patterns with light rare earth enrichment, heavy rare earth depletion, and negative δEu anomaly (0.51-0.63); 3) The total amount of PGE in different types of ores (7.71×10^-9-38.30×10^-9, average 23.00×10^-9) is significantly higher than that in various types of surrounding rocks (1.28×10^-9-2.44×10^-9, average 1.86×10^-9). Compared with the upper crust, the ores are obviously rich in Os, Ir, Pt, and Pd, and depleted of Ru and Rh; The surrounding rocks are rich in Os and depleted in Pt, Ru, Rh, and Pd, but PGE distribution curves of the two are highly similar, showing the V-type Ru deficiency, which is the (Os)-Pt-Pd type distribution model of the crust. The above characteristics indicate that different types of ores and surrounding rocks have obvious trace, REE and PGE geochemical inheritance, suggesting that the Lower Cambrian strata in Xiajiadian may be one of the important ore source strata. The Au/Ir ratio (4 821-299 666 and 406-8 050, respectively) and Pd/Ir ratio (16.9-588.0 and 15.2-47.5, respectively) of all ores and surrounding rocks vary widely, the Au/Ir ratios of both ores and surrounding rocks are much higher than those of carbonaceous chondrites and primitive mantle, the Pd/Ir ratios are much higher than those of magmatic ores, and the PGE distribution curves of ores and surrounding rocks of Xiajiadian gold deposit are consistent with those of the typical hydrothermal deposits, which show that Xiajiadian gold deposit has obvious hydrothermal genesis and is the product of tectonic hydrothermal fluid mineralization.

Key words: trace elements, platinum group elements, geochemistry, genesis of the deposit, Xiajiadian gold deposit, Shanyang-Zhashui ore concentration area, Southern Qinling Mountains

CLC Number:

P618.5

Zeng Zhijie, Chen Lei. Geochemistry of Trace and Platinum Group Elements of Xiajiadian Gold Deposit in Shanyang-Zhashui Ore Concentration Area in South Qinling: Implications of Ore Genesis[J].Journal of Jilin University(Earth Science Edition), 2021, 51(3): 704-722.

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Geochemistry of Trace and Platinum Group Elements of Xiajiadian Gold Deposit in Shanyang-Zhashui Ore Concentration Area in South Qinling: Implications of Ore Genesis

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