首页|宝山Cu?Pb?Zn多金属矿床流体演化证据:来自黄铁矿原位硫同位素和微量元素组成的制约

宝山Cu?Pb?Zn多金属矿床流体演化证据:来自黄铁矿原位硫同位素和微量元素组成的制约

Evidence of fluid evolution of Baoshan Cu−Pb−Zn polymetallic deposit: Constraints from in-situ sulfur isotope and trace element compositions of pyrite

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对宝山铜多金属矿床中的黄铁矿进行原位LA-ICP-MS和硫同位素研究,以探讨矿床的成矿过程和元素富集机制.选取矽卡岩型矿石中的3个世代黄铁矿(Py Ⅰ、PyⅡ和PyⅢ)以及中部、西部和北部(C_Py、W_Py和N_Py)矿区赋存在碳酸盐岩中的硫化物矿石里的黄铁矿为研究对象进行比较.与Py Ⅰ和PyⅢ相比,PyⅡ中大多数元素的含量明显较高.C_Py中砷和硒的含量很高且变化范围大,这两种元素在C_Py的生长带中呈解耦趋势.W_Py和N_Py中具有最高的砷、硒和铅含量.这些结果表明,成矿过程中伴随着温度的剧烈变化以及流体混合作用.岩浆热液间歇脉冲、流体混合作用以及水−岩相互作用导致温度和f(O2)波动以及变化.黄铁矿的硫同位素暗示硫主要为岩浆来源.f(O2)条件的变化是导致各类黄铁矿中硫同位素组成轻微差异的主要原因.最后,提出成矿模式以阐明宝山成矿过程.
In-situ LA-ICP-MS and S isotopes of pyrite from the Baoshan Cu polymetallic deposit were conducted to investigate the ore-forming process and the enrichment mechanism of elements. Three generations of pyrite (Py I, Py Ⅱ, and Py Ⅲ) in the skarn-type ores and pyrite in the carbonate-hosted sulfide ores from central, western, and northern (C_Py, W_Py, and N_Py) mining districts are selected for comparison. Compared with Py Ⅰ and Py Ⅲ, the contents of most elements in Py Ⅱ are apparently higher. The As and Se contents are high within a wide range and are decoupled in the growth band of the C_Py. The highest As, Se, and Pb contents were found in W_Py and N_Py. These results indicate the drastic changes in the temperature and fluid mixing during the mineralization. The occurrence of fluctuation and change in temperature and f(O2) was triggered by intermittent pulses of magmatic-hydrothermal fluids, mixing with meteoric water, and water−rock interactions. The sulfur isotopes of all species of pyrite indicated the magmatic source. The change in the f(O2) conditions caused slight differences in the sulfur isotope compositions. Consequently, a metallogenic model was proposed to explain the ore-forming processes.

pyritetrace elementin-situ S isotopehydraulic fracturingfluid mixing

张俊柯、邵拥军、陈可、谭华杰、谭睿昶、张天栋、刘忠法

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中南大学 有色金属成矿预测教育部重点实验室,长沙 410083

中南大学 地球科学与信息物理学院,长沙 410083

黄铁矿 微量元素 原位硫同位素 水压致裂 流体混合

We thank Ms.Xiu WEN and Mr.Yang XIAO (Guangzhou Tuoyan Testing Technology Co.,Ltd.,China)for their assistance and guidance durinWe thank Ms.Xiu WEN and Mr.Yang XIAO (Guangzhou Tuoyan Testing Technology Co.,Ltd.,China)for their assistance and guidance durinWe would like to thank Prof.Yu ZHANGWe would like to thank Prof.Yu ZHANGWe would like to thank Prof.Yu ZHANGThis research was funded by the National Key Research and Development Program of ChinaThis research was funded by the National Key Research and Development Program of China

Beijing Createch Testing Technology Co.Ltd.Chinafor the sulfur isotope analysesCentral South UniversityChangshaChinafor his valuable suggestions for improving this contributioNos.2018YFC06039042018YFC0603901

2021

10.1016/S1003-6326(21)65746-1

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(11)
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