| 丁 坤.南秦岭柞水-山阳矿集区龙头沟金矿床硫化物微量元素和硫同位素地球化学特征[J].地质与勘探,2021,57(5):969-980 |
| 南秦岭柞水-山阳矿集区龙头沟金矿床硫化物微量元素和硫同位素地球化学特征 |
| Sulfide trace elements and sulfur isotope geochemistry of the Longtougou gold deposit, Zhashui- Shanyang ore district, South Qinling |
| 投稿时间：2020-05-21 修订日期：2020-08-09 |
| DOI：10.12134/j.dzykt.2021.05.003 |
| 中文关键词: 成矿物质来源 S同位素 微量元素 龙头沟金矿床 柞山矿集区 南秦岭 |
| 英文关键词: metallogenic material source, S isotope, trace element, Longtougou gold deposit, Zhashui-Shanyang ore concentration area |
| 基金项目:国家自然科学基金项目（编号：41603040）、长安大学科技处创新团队培育项目（编号：1212011220869）和中国地质调查局项目（编号：DD2019057009）联合资助 |
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| 中文摘要: |
| 龙头沟矿床是南秦岭柞-山矿集区内新发现的中型金矿床。本文以矿床中的黄铁矿及黄铜矿为研究对象，在详细的室内、外研究的基础上，采用LA-ICPMS和LA-MC-ICPMS测试方法对成矿期不同阶段的硫化物进行微量元素及硫同位素成分研究。结果表明，黄铁矿Co含量为（0.33~183.93）×10-6，Co/Ni比值介于0.035~1.9之间，且Co/Ni 比值多小于1，表明黄铁矿可能形成于中低温环境，多具有沉积成因和沉积改造成因微量元素特征，黄铁矿中Au的富集可能与中低温多期岩浆热液活动有关。第Ⅰ阶段硫化物的δ34S值变化范围为0.1‰~3.74‰，均值为1.71‰，显示出幔源硫特征；而第Ⅱ阶段的δ34S=-13.99‰~13.35‰，均值为2.17‰，介于0±3‰之间，显示该阶段可能是幔源与赋矿围岩发生水岩反应；第Ⅲ阶段δ34S=7.44‰~14.72‰，低于围岩（δ34S=18.14‰~20.54‰），显示该阶段可能有地层硫参与，是上升的成矿流体与赋矿围岩发生水岩反应，硫同位素特征指示硫可能由幔源和赋矿围岩混合而成。 |
| 英文摘要: |
| The Longtougou deposit is a newly discovered medium-sized gold ore occurrence in the Zhashui-Shanyang ore concentration area of South Qinling. This study focuses on pyrite and chalcopyrite in this deposit. Based on detailed indoor and outdoor research, LA-ICPMS and LA-MC-ICPMS are used to analyze the trace elements and sulfur isotope composition of sulfide in different stages of mineralization of this district. The results show that the Co content of pyrite is (0.33~183.93)×10-6, the Co/Ni ratio is between 0.035 and 1.9, and the Co/Ni ratio is mostly less than 1.0, indicating pyrite might formed in a medium-low temperature environment with a characteristic of trace elements associated with sedimentary genesis and sedimentary reformation. The enrichment of Au in pyrite may be related to multi-stage magmatic hydrothermal activities at medium low temperature. The values of δ34S value in the first stage of sulfide are 0.1‰~3.74‰，1.71 on average, showing the characteristics of mantle sulfur; -13.99‰~13.35‰ for the second stage, 2.17‰ on average or between 0 and 3‰, indicating that the water-rock reaction might occur between the mantle source and the host rock; The and 7.44‰~14.72‰ for the third stage, lower than the surrounding rock (δ34S = 18.14‰~20.54‰), implying sulfur of strata might be involved, which is the water rock reaction between the rising ore-forming fluid and the host rock, and the sulfur might be resulted from mixture of the mantle source and host rock. |
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