Geological Characteristics and Genesis of the Wangjiaping Gold Deposit in Zhashui-Shanyang Ore Concentration area of South Qinling
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摘要: 王家坪矿床位于南秦岭柞水-山阳矿集区东部,金矿体主要产于上泥盆统星红铺组沉积地层中;金属矿物以黄铁矿为主,与金成矿关系密切的矿物为黄铁矿和雌黄。笔者利用LA-ICPMS和LA-MC-ICPMS对成矿期不同阶段硫化物进行微量元素及硫同位素研究,结果表明,该矿床成矿中阶段黄铁矿Co/Ni值为0.003~1.1,均小于1,暗示黄铁矿不可能为火山成因;成矿晚阶段黄铁矿Co/Ni值介于0.02~5.87,表明该阶段黄铁矿与岩浆作用和沉积作用有关。硫同位素测试结果显示,成矿早阶段硫化物δ34S为-28.5‰~20.33‰,成矿中阶段硫化物的δ34S为-28.5‰~-19.95‰,成矿晚阶段硫化物的δ34S为11.91‰~20.33‰,暗示硫同位素组成变化很大,具有明显的多源性特征,成矿过程中硫可能由岩浆S和赋矿围岩S混合而成。王家坪矿床为卡林型金矿床,该矿床的发现对在柞水-山阳矿集区寻找卡林型金矿床具有重要借鉴意义。Abstract: The Wangjiaping gold deposit is located in the east of Zhashui-Shanyang ore concentration area in South Qinling.The gold ore body mainly lies in the sedimentary strata of the upper Devonian Xinghongpu Formation, with pyrite being the main metal mineral. Gold mineralization are closely related to pyrite and orpiment. In this paper, LA-ICPMS and LA-MC-ICPMS were used to study the trace elements and sulfur isotopes of sulfide in different stages of mineralization.The results show that the Co/Ni ratios of pyrite in the middle stage of mineralization range from 0.003 to 1.1, most of which are less than 1, excluding volcanic origin. In addition, The Co/Ni ratios of pyrite in the late stage of mineralization range from 0.02 to 5.87, suggesting that pyrite in this stage is related to magmatism and sedimentation process. The S isotope results show that the δ34S value of early sulfide ranges from -28.5‰ to 20.33‰. The sulfide from intermediate stage ranges from -28.5‰ to -19.95‰,whereas the late sulfide ranges from 11.91‰ to 20.33‰,suggesting an inhomogeneous sulfur isotopic composition and an obvious multi-source characteristics. Hence, it is inferred that the sulfur may be derived from the mixture of sulfur and host rock sulfur. Therefore, the Wangjiaping deposit is a Carlin-type gold deposit.It has great significance for the future prospecting of Carlin-type gold deposit in Zhashui-Shanyang ore concentration area.
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