| 滇东南都龙Sn-Zn多金属矿床交生硫化物微区主量元素、硫同位素特征及成因研究 |
| Received:October 27, 2021 Revised:June 09, 2022 点此下载全文 |
| 引用本文：XU SaiHua,REN Tao,BAI Xin,YE QinFu,and Han Bin.2022.In-situ major elements and sulfur isotope analysis of intergrowth sulfide in Dulong Sn-Zn polymetallic deposit, SE Yunnan and study on their genesis[J].Mineral Deposits,41(4):741~750 |
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| Author Name | Affiliation | E-mail | | XU SaiHua | Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China | | | REN Tao | Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China | rentao@kust.edu.cn | | BAI Xin | Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China | | | YE QinFu | Yunnan Hualian Zinc and Indium Stock Co., Ltd., Wenshan 663701, Yunnan, China | | | and Han Bin | Yunnan Hualian Zinc and Indium Stock Co., Ltd., Wenshan 663701, Yunnan, China | |
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| 基金项目:本文得到国家自然科学基金(编号:41663005)和国资青拔人才项目联合资助 |
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| 中文摘要:都龙Sn-Zn多金属矿床位于滇东南老君山锡锌钨多金属成矿区南部，是中国3大锡石硫化物矿床之一。该矿床发育闪锌矿-黄铜矿-磁黄铁矿密切共生结构，即硫化物交生结构。文章利用电子探针和LA-MC-ICP-MS对具有交生结构的闪锌矿-黄铜矿-磁黄铁矿和毒砂进行了微区主量元素和硫同位素测试，以期明确其成因及硫的来源。主量元素测试结果显示，闪锌矿中的w(Zn)为52.23%~57.22%，w(S)为33.06%~36.10%，w(Fe)为9.92%~12.24%，w(Cu)为0.11%~0.30%；黄铜矿中的w(Cu)为33.95%~35.08%，w(S)为33.49%~35.27%，w(Fe)为30.74%~31.41%，w(Zn)为0.04%~1.50%；磁黄铁矿中的w(Fe)为49.30%~51.94%，w(S)为38.36%~39.69%，w(Zn)为9.35%~11.01%，w(Cu)为0.05%~0.15%。磁黄铁矿和黄铜矿包裹体边部和核部成分均一，且投影点全部落在固溶体出溶区域，说明都龙矿床交生闪锌矿-黄铜矿-磁黄铁矿是固溶体分离成因。原位S同位素分析结果显示，闪锌矿的δ34S为0.9‰~3.2‰，磁黄铁矿的δ34S为0.6‰~2.1‰，毒砂的δ34S为2.9‰~4.2‰，黄铜矿的δ34S为0.6‰~2.8‰，均显示为岩浆来源特征。主量元素温度计估算的闪锌矿-黄铜矿的形成温度介于285~394℃，指示该矿床主要硫化物形成于中高温阶段。 |
| 中文关键词:地球化学 交生硫化物 原位硫同位素 温度计 都龙矿床 滇东南 |
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| In-situ major elements and sulfur isotope analysis of intergrowth sulfide in Dulong Sn-Zn polymetallic deposit, SE Yunnan and study on their genesis |
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| Abstract:The Dulong Sn-Zn polymetallic deposit is located in the southern part of the Laojunshan Sn-Zn-W polymetallic ore district in SE Yunnan, which is one of the largest cassiterite-sulfide deposits in China. A large number of intimate intergrowths of chalcopyrite, sphalerite and pyrrhotite are found in the deposit. In this paper, the genesis and source of the sulfide minerals are studied based on the data of the bulk chemical compositions of sphalerite, chalcopyrite and pyrrhotite and in-situ sulfur isotope of sphalerite, arsenopyrite, chalcopyrite and pyrrhotite in the Dulong deposit, which are from a systematic analysis of sulfides by means of electron microprobe and LA-MC-ICP-MS. The results show that the contents of Zn in sphalerite vary from 52.23% to 57.22%, S from 33.06% to 36.10%, Fe from 9.92% to 12.24%, Cu from 0.11% to 0.30%. The contents of Cu, S, Fe and Zn in chalcopyrite vary from 33.95% to 35.08%, 33.49% to 35.27%, 30.74% to 31.41% and 0.04% to 1.50%, respectively. The pyrrhotite has Fe, S, Zn and Cu concentrations of 49.30% to 51.94%, 38.36% to 39.69%, 9.35% to 11.01% and 0.05% to 0.15%, respectively. Chalcopyrite and pyrrhotite inclusions in sphalerite have uniform bulk chemical compositions for both core and margin zones and all data are plotted in solid solution field. Therefore, it is highly likely that the chalcopyrite and pyrrhotite dots were exsolved from sphalerite deposited. In-situ δ34S values of sphalerite, pyrrhotite, chalcopyrite and arsenopyrite are of 0.9‰ to 3.2‰, 0.6‰ to 2.1‰, 0.6‰ to 2.8‰, 2.9‰ to 4.2‰, respectively, suggesting that the sulfur in the Dulong deposit originated from magma. The formation temperatures of sulfides calculated by major element thermometer vary from 285℃ to 394℃, indicating that the sulfides in the Dulong deposit formed in the medium and high temperature stage. |
| keywords:geochemistry intimate intergrowth of sulfide in-situ sulfur isotope geothermometer Dulong deposit SE Yunnan |
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