西藏浦桑果钴铜铅锌矿床闪锌矿微量元素组成特征与指示意义
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本文为四川省自然科学基金青年基金项目(编号2023NSFSC0783)、四川省省级大学生创新创业训练计划项目(编号X2022049)和成都理工大学自然资源部构造成矿成藏重点实验室开放基金(编号gzck202204)联合资助的成果


Trace element composition characteristics of sphalerite in the Pusangguo Co- Cu- Pb- Zn deposit in Tibet and its indicative significance
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    摘要:

    位于东特提斯成矿域的西藏冈底斯成矿带是我国著名的铜铅锌等有色金属矿产地之一,浦桑果矿床是该成矿带内近年来找矿勘查新发现的大型富钴铜铅锌矿床,矿体主要赋存在岩体与早白垩世塔克那组接触带内,成矿作用复杂。闪锌矿是浦桑果矿床主成矿期(石英- 硫化物阶段)的主要金属硫化物之一,主要发育深棕色~棕褐色的Ⅰ类闪锌矿(SpⅠ)和浅棕色~黄棕色的Ⅱ类闪锌矿(SpⅡ)。本文采用电子探针(EMPA)和激光剥蚀电感耦合等离子质谱(LA- ICP- MS),对矿区不同类型的闪锌矿开展原位微区主、微量元素分析。主、微量元素分析结果表明,闪锌矿中普遍富集Co元素且SpⅠ中Co元素含量明显高于SpⅡ中的Co元素含量,Co元素主要以类质同象形式替代Zn元素(Co2+→Zn2+);SpⅠ和SpⅡ均具有富集Fe、Mn、Cd而贫Ga、Ge、In的成分特征,其中Fe、Mn、Cd等元素主要以类质同象形式产出,而Cu、Ag、Pb、As等元素则主要以矿物包裹体形式赋存于闪锌矿中。根据不同元素间的相关关系,认为浦桑果矿床闪锌矿中可能存在Fe2++Mn2+→2Zn2+、(In3+, Sn3+)+(Cu+, Ag+)→2Zn2+、As3++Ag+→2Zn2+、Pb2++2As3++□→4Zn2+(□为晶格空位)等简单和复杂的元素替代机制。结合闪锌矿中Fe、Mn、Ge元素含量和In/Ga、In/Ge、Zn/Cd元素比值与闪锌矿GGIMFis地质温度计的计算结果,指示浦桑果矿床闪锌矿形成于中高温(237~345℃)、低氧逸度、低硫逸度(lgS2=13. 4~8. 3)的环境。

    Abstract:

    The Gangdese metallogenic belt (GMB) in Tibet, located in the East Tethys metallogenic domain, is one of the famous Pb, Zn and other nonferrous metal areas in China. The Pusangguo is a large newly discovered cobalt- rich Cu- Pb- Zn deposit in recent years. The ore bodies mainly occurred in the contact zone between the magma and the Early Cretaceous Takena Formation strata, with the complex mineralization. Sphalerite is one of the main sulfides in the quartz- sulfides mineralization stage in the Pushangguo deposit. It mainly contains two different types: dark- brown type I sphalerite (SpI) and light- brown type II sphalerite (SpII). In this paper, the electron microprobe analysis (EMPA) and laser ablation inductively coupled plasma mass spectrometer (LA- ICP- MS) were used to analyze the major and trace elements in sphalerites. The results show that the sphalerite is generally rich in Co, and the content of Co in SpI is obviously higher than that in SpII. Co mainly replaces Zn element (Co) in the form of isomorphism Co2+ Zn2+; Both SpI and SpII are characterized by enrichment of Fe, Mn, Cd and depletion of Ga, Ge, In, among which Fe, Mn, Cd and other elements occur mainly in the form of isomorphism, while Cu, Ag, Pb, As and other elements occur mainly in sphalerite in the form of mineral inclusions. According to the correlation between different trace elements, it is considered that there may be Fe2++Mn2+→2Zn2+、(In3+, Sn3+)+(Cu+, Ag+)→2Zn2+、As3++Ag+→2Zn2+、Pb2++2As3++□→4Zn2+ (□is lattice vacancy) and other simple complex element substitution mechanisms. The ratios of Fe, Mn, Ge, In/Ga, In/Ge, Zn/Cd in sphalerite and the calculation results based on the sphalerite GGIMPis geothermometer indicate that sphalerite was formed in the environment of medium- high temperature (237~345℃), low oxygen fugacity and low sulfur fugacity (lgfS2=13. 4~8. 3).

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李壮,郎兴海,刘慧,詹宏宇,谭豪,张鹏.2024.西藏浦桑果钴铜铅锌矿床闪锌矿微量元素组成特征与指示意义[J].地质学报,98(10):3077-3093.
LI Zhuang, LANG Xinghai, LIU Hui, ZHAN Hongyu, TAN Hao, ZHANG Peng.2024. Trace element composition characteristics of sphalerite in the Pusangguo Co- Cu- Pb- Zn deposit in Tibet and its indicative significance[J]. Acta Geologica Sinica,98(10):3077-3093.

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  • 在线发布日期: 2024-10-22
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