| 袁鑫.新疆火烧云超大型铅锌矿床闪锌矿微量(稀散)元素组成特征与指示意义[J].地质与勘探,2022,58(3):545-560 |
| 新疆火烧云超大型铅锌矿床闪锌矿微量(稀散)元素组成特征与指示意义 |
| The trace (dispersed) elements in sphalerite from Huoshaoyun giant lead-zinc deposit, Xinjiang and their geological implications |
| 投稿时间：2021-03-15 修订日期：2021-10-20 |
| DOI：10.12134/j.dzykt.2022.03.007 |
| 中文关键词: 闪锌矿 微量元素 稀散元素 LA-ICP-MS Mapping MVT型矿床 火烧云铅锌矿床 新疆 |
| 英文关键词: sphalerite, trace elements, dispersed elements, LA-ICP-MS, Mapping, MVT deposit, Huoshaoyun Pb-Zn deposit, Xinjiang |
| 基金项目:国家重点研发计划项目(编号：2017YFC0602502)、国家自然科学基金项目(编号：41402063、41672093)、湖北省自然科学基金(编号：2019CFB586)和油气资源与勘探技术教育部重点实验室(长江大学)开放基金项目(编号：KY-2018-05) 联合资助 |
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| 中文摘要: |
| 位于青藏高原西北部的新疆和田火烧云超大型铅锌矿床是近年来我国乃至全球最重要的铅锌找矿发现之一。该矿床矿石矿物以铅锌碳酸盐为主（菱锌矿和白铅矿），同时还发育有少量的铅锌硫化物矿体，目前对于火烧云矿床的成因还存在较大分歧。本文以矿床硫化物矿体中闪锌矿为研究对象，通过LA-ICP-MS微量元素测试和Mapping分析，揭示闪锌矿中微量元素（稀散元素）的富集规律和赋存状态，为矿床成因的厘定提供依据。结果表明，火烧云铅锌矿床闪锌矿微量元素分布很不均一，以富集Cd、Tl、Ge等稀散元素为特征；Cd、Tl、Ge、Mn、As和Hg等微量元素以类质同象的形式赋存在闪锌矿之中，且Cu与Ge的含量呈现较好的线性关系，推测在闪锌矿结晶过程中存在3Zn2+?Ge4++2Cu+的替代机制，Cd进入闪锌矿的方式可能为Zn2+?Cd2+，且Cd的异常富集可能与闪锌矿中低的Fe含量有关；闪锌矿中微量元素Ga、Ge、Fe、Mn、In的组成特征指示了硫化物矿体形成于低温环境（65~140℃），与MVT型矿床有一致的温度范围。总体上，该矿床中的闪锌矿以富集Cd、Tl、Ge，贫Fe、Mn、In为特征，这与典型的MVT矿床基本一致，明显区别于SEDEX、VMS与矽卡岩型铅锌矿床。结合矿床地质特征，认为火烧云铅锌矿床中硫化物矿体成因与金顶铅锌矿床类似，属于MVT型矿床。 |
| 英文摘要: |
| The Huoshaoyun giant lead-zinc deposit in Hetian County, Xinjiang, located in the northwest of Qinghai-Tibet Plateau, is one of the most important lead-zinc prospecting discoveries in China and even in the world in recent years. The ore minerals of the deposit are mainly lead-zinc carbonate (smithsonite and cerussite), and few lead-zinc sulfide ore bodies are also developed. There are still great differences in the genesis of the volcanic cloud deposits. In this paper, sphalerite in sulfide ore body of the deposit is taken as the research object. Through LA-ICP-MS trace element test and Mapping analysis, the enrichment law and occurrence state of trace elements (dispersed elements) in sphalerite are revealed, and the basis for determining the genesis of the deposit is provided. The test results show that the distribution of trace elements in sphalerite of Huoshaoyun Pb-Zn deposit is very inhomogeneous, which is characterized by enrichment of rare elements such as Cd, Tl and Ge. The trace elements such as Cd, Tl, Ge, Mn, As and Hg occur in sphalerite in the form of isomorphism, and the content of Cu and Ge shows a good linear relationship. It is speculated that there is a substitution mechanism of 3Zn2+ ? Ge4+ + 2Cu+ in the crystallization process of sphalerite. The way of Cd entering sphalerite may be Zn2+ ? Cd2+, and the abnormal enrichment of Cd may be related to the low Fe content in sphalerite. The composition characteristics of trace elements Ga, Ge, Fe, Mn and In in sphalerite indicate that sulfide ore bodies are formed in low temperature environment (65~140℃), which is consistent with the temperature range of MVT type deposits. In general, the sphalerite in the deposit is characterized by enrichment of Cd, TL, Ge and depletion of Fe, Mn, In, which is basically consistent with the typical MVT deposit, and is obviously different from SEDEX, VMS and skarn type lead-zinc deposits. Combined with the geological characteristics of the deposit, we propose that Huoshaoyun lead-zinc deposit is similar to Jinding lead-zinc deposit and could be classified as MVT deposit. |
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