| 董海雨,汪劲草,汤静如,余何,李细光.广西北山铅锌矿S、Pb同位素特征及地质意义[J].矿产勘查,2019,(3):554-565 |
| 广西北山铅锌矿S、Pb同位素特征及地质意义 |
| The characteristics and geological significance of S and Pb isotopes in the Beishan Pb-Zn deposit, Guangxi |
| 投稿时间：2018-07-12 |
| DOI： |
| 中文关键词: 构造 S、Pb同位素 矿床成因 北山铅锌矿床 |
| 英文关键词: ore body morphology,karstification,S,Pb isotopes,genesis of ore deposits,Beishan Pb-Zn deposit |
| 基金项目:广西自然科学基金项目(2016GXNSFAA380129)；有色及贵金属隐伏矿床勘查教育部工程研究中心项目(2018GCZX002)广西科技计划项目(桂科AB17195022)联合资助。 |
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| 中文摘要: |
| 基于矿体分析,北山矿床存在两种矿体类型:岩溶型矿体和断裂型矿体。其中Ⅰ、Ⅱ号矿体是岩溶型矿体、Ⅲ号矿体是断裂构造型矿体。矿体形态以似层状、管状、囊状、脉状为主。矿石矿物简单,主要金属矿物是闪锌矿和方铅矿,围岩蚀变较弱。同位素研究表明,该矿床硫化物δ34S值变化范围为-3.84‰～+4.56‰,平均值-1.30‰,集中于零值附近,变化大,暗示矿区硫可能主要来自于沉积地层的贡献。铅的同位素206Pb/204Pb=18.006～18.084,均值18.043, 207Pb/204Pb =15.651～15.731,均值15.688, 208Pb/204Pb= 38.258～38.525,均值38.437。通过Pb同位素对比,点均落在上地壳平均Pb演化曲线附近,显示成矿金属具有壳源特征,可能来自于基底。综合矿床学、岩石学、矿体形貌学、S和Pb同位素数据,认为北山铅锌矿属于密西西比河谷型( MVT) 矿床。 |
| 英文摘要: |
| Based on the ore body analysis, there are two types of ore bodies in the Beishan deposit:karst-type ore bodies and fault-type ore bodies. The ore bodies No. I and No. II are karst type ore bodies; No. III ore body is a fractured ore body. The ore body morphology is mainly stratified, cystic, and veinlike. Ore minerals are simple, sphalerite and galena are the main metal minerals, and the wall rock alterations are weak.This study shows that the sulfide δ34S values of the deposit vary from -3.84‰ to +4.56‰, with an average of -1.2‰, which are mostly concentrated in the range of Sedimentary formation sulfur. The 206Pb/204Pb ratios range from 18.006 to 18.084 ( average 18.043),207Pb/204Pb from 15.651 to 15.731(average 15.688) and 208Pb/204Pb from38.258 to 38.525(average 38.437). By comparison with the Plumobtectonic mode of lead isotopes (Zartmanand Doe, 1981), all data fall near the growth curve of the mean upper crust lead, indicating that the Pb might have been sourced from crust sources, basement rocks was likely the most sources. It is considered that the Beishan lead-zinc deposit belongs to a MVT deposit through this study. |
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