| 西藏扎西康矿集区夏隆岗铅锌矿床地质特征及其成矿物质来源研究:硫化物原位S同位素制约 |
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| 引用本文： | 刘宇奇,张志,李光明,卿成石,张林奎,凌晨,马国桃.西藏扎西康矿集区夏隆岗铅锌矿床地质特征及其成矿物质来源研究:硫化物原位S同位素制约[J].矿物岩石,2021,41(1):93-105. |
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| 作者姓名： | 刘宇奇 张志 李光明 卿成石 张林奎 凌晨 马国桃 |
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| 作者单位： | 成都理工大学地球科学学院,四川成都 610059;中国地质调查局成都地质调查中心,四川成都 610083 |
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| 基金项目： | 国家自然科学重点基金项目(编号:91955208);第二次青藏高原综合科学考察研究(2019QZKK0806);中国地质调查局“西藏山南地区铍锡多金属矿调查评价”(DD20190147)。 |
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| 摘 要： | 夏隆岗铅锌矿床是扎西康矿集区内新近发现的铅锌矿床。矿床已发现的铅锌矿体受控于北东向、近南北向断裂构造。通过系统的钻孔编录,结合脉体穿插关系及矿物共生组合特征,可将矿床热液成矿期分为3个阶段。分别为:铁锰碳酸盐—多金属硫化物阶段(S1);石英—方解石—多金属硫化物阶段(S2);石英—硫盐矿物阶段(S3)。本次研究系统测试了该矿床热液成矿期不同阶段硫化物的原位硫同位素组成,发现了明显的差别。结果表明,S1阶段金属硫化物的δ~(34)SV-CDT值介于-1.92‰~3.77‰之间,平均值为0.86‰,指示热液成矿早期S来源于岩浆。而S2阶段及S3阶段硫化物则具有不同的S同位素值,其中S2阶段金属硫化物的δ~(34)SV-CDT=4.42‰~9.09‰,平均值为7.25‰。S3阶段脆硫锑铅矿δ~(34)SV-CDT=5.27‰~5.54‰,平均值为5.41‰。S2成矿阶段、S3成矿阶段硫化物δ~(34)SV-CDT值与区域上围岩地层S同位素较为相似,表明矿床热液成矿晚期有地层硫的加入。综合研究表明,夏隆岗铅锌矿床为与岩浆热液活动相关的热液脉型矿床。
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| 关 键 词： | 夏隆岗 铅锌多金属 硫同位素 西藏 扎西康 |
GEOLOGICAL CHARACTERISTICS AND SOURCE OF ORE-FORMING MA-TERIALS OF XIALONGGANG LEAD-ZINC DEPOSIT IN ZHAXIKANG ORE CONCENTRATION AREA,TIBET:CONSTRAINT OF IN-SITU S ISOTOPE OF SULFIDE |
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| Liu Yuqi,Zhang Zhi,Li Guangming,Qing Chengshi,Zhang Linkui,Ling Chen,Ma Guotao.GEOLOGICAL CHARACTERISTICS AND SOURCE OF ORE-FORMING MA-TERIALS OF XIALONGGANG LEAD-ZINC DEPOSIT IN ZHAXIKANG ORE CONCENTRATION AREA,TIBET:CONSTRAINT OF IN-SITU S ISOTOPE OF SULFIDE[J].Journal of Mineralogy and Petrology,2021,41(1):93-105. |
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| Authors: | Liu Yuqi Zhang Zhi Li Guangming Qing Chengshi Zhang Linkui Ling Chen Ma Guotao |
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| Institution: | (College of Earth Science,Chengdu University of Technology,Chengdu,Sichan 610059,China;Chengdu Centre of China Geological Survey,Chengdu,Sichan 610083,China) |
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| Abstract: | The ore bodies in the newly discovered Pb-Zn deposit in Zhaxikang ore concentration area are controlled by NE-SW trending and nearly N-S trending faults.Systematic borehole cataloging,combined with the intersecting relationship of veins and the characteristics of mineral symbiotic association in the deposit reveals that the hydrothermal mineralization period of the deposit can be divided into three stages,the Fe-Mn carbonate-polymetallic sulfide stage(S1),Quartz-calcite polymetallic sulfide stage(S2)and Quartz-sulphite mineral stage(S3).The in-situ sulfur isotopic compositions of sulfide in different stages of hydrothermal mineralization of the deposit have been systematically tested and obvious differences among these mineralization stages have been found.The results show that theδ34SV-CDT values of metallic sulfides in S1 stage range from-1.92‰to 3.77‰,with an average value of 0.86‰,indicating that the S element originated from magma in the early stage of hydrothermal mineralization.The S isotope values of sulfides are different in S2 stage and S3 stage,in which theδ34SV-CDT of metal sulfide in S2 stage is 4.42‰-9.09‰,with an average value of 7.25‰and theδ34SV-CDT of S3 stage brittle antimony lead is 5.27‰-5.54‰,with an average value of 5.41‰.It shows that theδ34SV-CDT values of sulfide in the S2 and S3 mineralization stages are similar to the S isotopes of surrounding rock in the region,indicating that formation sulfur was added in the late hydrothermal mineralization stage of the deposit.Through comprehensive study,it is considered that the Xialonggang Pb-Zn deposit is a hydrothermal vein type deposit related to magmatic hydrothermal activity. |
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| Keywords: | Xialonggang Pb-Zn polymetallic ore sulfur isotope Tibet Zaxikang |
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