| 滇东北麻栗坪铅锌矿床微量元素分布与赋存状态:LA-ICPMS研究 |
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| 引用本文： | 胡宇思,叶霖,黄智龙,李珍立,韦晨,Danyushevskiy Leonid.滇东北麻栗坪铅锌矿床微量元素分布与赋存状态:LA-ICPMS研究[J].岩石学报,2019,35(11):3477-3492. |
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| 作者姓名： | 胡宇思 叶霖 黄智龙 李珍立 韦晨 Danyushevskiy Leonid |
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| 作者单位： | 中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550081;中国科学院大学, 北京 100049,中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550081,中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550081,中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550081;中国科学院大学, 北京 100049,中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳 550081;中国科学院大学, 北京 100049,CODES, University of Tasmania, Hobart, Tas. 7001 |
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| 基金项目： | 本文受国家重点研发计划（2017YFC0602502）、国家自然科学基金项目（41673056）、贵州省重点基金（黔科合基础[2017]1421）、国家自然科学重点基金项目（41430315）和国家"973"项目（2014CB440900）联合资助. |
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| 摘 要： | 位于扬子板块西南缘的"川滇黔接壤铅锌矿集区"是我国西南大面积低温成矿域的重要组成部分,麻栗坪铅锌矿床位于该矿集区昭通-曲靖成矿带中段,是近年来滇东北地区新发现的铅锌矿床。本文以麻栗坪铅锌矿不同硫化物为研究对象,通过LA-ICPMS原位点测试和元素Mapping分析,尝试揭示该矿床中Ge、Cd和In等微量元素在不同硫化物中分布规律与赋存状态。本次研究发现,麻栗坪矿床不同硫化物中富集的微量元素明显不同,闪锌矿主要富集Mn、Cu、Sn、Cd、In和Ge,而方铅矿主要富集Ag、Sb和Se,黄铁矿则富集As、Co和Ni。闪锌矿是分散元素Ge、In和Cd的主要载体矿物,且Cd、Ge、In、Mn、As、Sb和Ag以类质同象形式赋存于闪锌矿中;而Cu则主要以类质同象形式存在,部分Cu以黄铜矿的显微包裹体形式赋存于闪锌矿中,其中以类质同象赋存于闪锌矿中Cu和Ge呈现明显的相关性,可能暗示其与Zn的置换方式为:3Zn2+Ge4++2Cu+。总体上,该矿床闪锌矿以富集Cd、Ge,贫Fe、Mn、Co、Sn为特征,这些微量元素组成与典型MVT型矿床基本一致,明显有别于喷流沉积和岩浆热液型矿床,而与中低温条件下形成的闪锌矿微量元素组成相似。结合该矿床后生成矿特征明显等地质地球化学研究成果,我们认为该矿床应属于MVT型铅锌矿床。值得注意的是,该矿床闪锌矿相对富集In,可能暗示其形成具有特殊性,这可能与其成矿流体在长距离运移过程中所流经地层有关,该类流体活化萃取了基底地层的中-酸性岩浆岩或火山碎屑岩中的In,致使矿床中闪锌矿相对富集In。
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| 关 键 词： | 麻栗坪铅锌矿床 微量元素 分散元素 LA-ICMPS MVT铅锌矿床 |
| 收稿时间： | 2018/11/8 0:00:00 |
| 修稿时间： | 2019/2/15 0:00:00 |
Distribution and existing forms of trace elements from Maliping Pb-Zn deposit in northeastern Yunnan, China: A LA-ICPMS study |
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| HU YuSi,YE Lin,HUANG ZhiLong,LI ZhenLi,WEI Chen and DANYUSHEVSKIY Leonid.Distribution and existing forms of trace elements from Maliping Pb-Zn deposit in northeastern Yunnan, China: A LA-ICPMS study[J].Acta Petrologica Sinica,2019,35(11):3477-3492. |
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| Authors: | HU YuSi YE Lin HUANG ZhiLong LI ZhenLi WEI Chen and DANYUSHEVSKIY Leonid |
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| Institution: | State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;University of Chinese Academy of Sciences, Beijing 100049, China,State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China,State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China,State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;University of Chinese Academy of Sciences, Beijing 100049, China,State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;University of Chinese Academy of Sciences, Beijing 100049, China and CODES, University of Tasmania, Hobart, Tas. 7001, Australia |
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| Abstract: | The Sichuan-Yunnan-Guizhou (SYG) Pb-Zn metallogenic province, located in southwestern margin of the Yangtze Block, is an important part of the large-scale low-temperature metallogenic domain in southwestern China. The Maliping Pb-Zn deposit, situated in the central part of Zhaotong-Qujing metallogenic belt, was found in northeastern Yunnan Province recently. The orebody is hosted in Late Cambrian Yuhucun Formation, occurring as stratabound, lense and venis. The mineral assemblage of the Maliping deposit is relatively simple. The main sulfide minerals are sphalerite and galena with minor pyrite. Gangue minerals include mainly dolomite, calcite, quartz and barite. LA-ICPMS spots and mapping analysis for the different sulfides from Maliping Pb-Zn deposit, and the distribution and existing forms of germanium, cadmium, indium and other trace elements were investigated. The results show that different sulfides are characterized by different contents of trace elements. Mn, Cu, Sn, Cd, In and Ge are mainly enriched in sphalerite, while galena from this deposit is enrichment of Ag, Sb and Se, and pyrite is characterized by enrichment of As, Co and Ni. Comparing with the content of dispersed elements in different sulfides, the results indicate that sphalerite is the primary carrier mineral of Ge, In and Cd. Cd, Ge, In, Mn, As, Sb and Ag occur as isomorphous substitution in the sphalerite, and Cu mostly exists in sphalerite as isomorphism but part of Cu occurs as micro-inclusions (chalcopyrite) in sphalerite. Considered the distinct positive relationship between Cu and Ge, the results imply that the substitution mechanism of Ge and Cu is possibly 3Zn2+↔Ge4++2Cu+. Additionally, sphalerite from Maliping Pb-Zn deposit is characterized by enrichment of Cd, Ge and depleted in Mn, Fe, Co and Sn which coincides with the feature of MVT Pb-Zn deposit and differs from the sedimentary-exhalative deposit and magmatic-hydrothermal deposit. On account of the geological features, other geochemical researches and its ore-forming temperature belonging to low temperature, it is suggested that the Maliping deposit belongs to an MVT Pb-Zn deposit. Notably, we imply that ore-forming fluid extracted indium of magmatic and volcaniclastic rocks from the metamorphic basement, resulting in the enrichment of indium in sphalerite from the deposit. |
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| Keywords: | Maliping Pb-Zn deposit Trace elements Dispersed elements LA-ICPMS MVT Pb-Zn ore deposit |
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