| 章 勇.湘南宝山铅锌银矿床硫同位素的地球化学特征及地质意义[J].地质与勘探,2018,54(1):82-89 |
| 湘南宝山铅锌银矿床硫同位素的地球化学特征及地质意义 |
| Geochemical characteristics and geological significance of sulfur isotopes in the Baoshan Pb-Zn-Ag deposit, southern Hunan Province |
| 投稿时间：2017-06-12 修订日期：2017-10-11 |
| DOI：10.12134/j.dzykt.2018.01.009 |
| 中文关键词: 热液总硫 硫同位素 岩浆硫 分馏平衡 宝山 湖南 |
| 英文关键词: hydrothermal total sulfur, sulfur isotope, magma sulfur, fractionation balance, Baoshan,Hunan Province |
| 基金项目:中国地质调查局湖南坪宝地区铜铅锌多金属矿调查评价项目（编号：1212011121116）资助 |
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| 中文摘要: |
| 成矿热液的总硫同位素组成(ΣS)可以更加准确的反映成矿流体中硫的来源，本文通过对湖南宝山矿床硫同位素以及总硫同位素的研究发现，金属硫化物样品的δ34S值绝大多数为正值，变化区间为6.40‰~6.91‰，一般为-1.00‰~4.57‰，均值为2.22‰ ，其中黄铁矿δ34S 变化范围为-1‰~4.61‰，均值为2.92‰；方铅矿δ34S 变化范围为-0.80‰~1.70‰，均值为0.53‰；闪锌矿δ34S 变化范围为1.80‰~4.31‰ ，均值为2.69‰。具有集中的 δ34S 值分布以及单一的峰值，表明硫的来源比较单一，具有岩浆硫特点，同位素组成具有δ34S黄铁矿>δ34S闪锌矿>δ34S方铅矿特征，证明成矿物质沉淀时基本达到了硫同位素分馏平衡。通过总硫同位素的分析，得出高温与低温两组数据，通过Pinckney图解计算获得中低温阶段的δ34SΣS为1.28‰，高温阶段的δ34SΣS为1.68‰。表明成矿流体的硫同位素组成变化很小，仅有0.4‰,且其总硫同位素组成为1.78‰，均显示矿床成矿流体具有地幔硫的特点，表明矿床中的硫可能来自地幔。 |
| 英文摘要: |
| Total sulfur isotope composition (ΣS) of the metallogenic hydrothermal fluid can reflect the source of sulfur in the ore-forming fluid more accurately. This work studies the sulfur isotopes and the total sulfur isotope in the Baoshan deposit of Hunan Province. The results show that the most δ34S values of the metal sulfide sample are positive, changing in 6.40 ‰ ~ 6.91 ‰, generally -1.00 ‰ ~ 4.57 ‰, with average 2.22 ‰. Of them pyrite δ34S ranges -1 ‰ ~ 4.61 ‰ with 2.92 ‰ on average. The range of the δ34S values of galena is -0.80 ‰ ~ 1.70 ‰, with a mean value 0.53 ‰. The δ34S range of the sphalerite is 1.80 ‰ ~ 4.31 ‰, 2.69 ‰ on average. The δ34S values are concentrated with a single peak, which indicates that the source of sulfur is single, with the characteristic of magma sulfur. The sulfur isotopic compositions of the sulfides show characteristic of δ34S pyrite> δ34S sphalerite> δ34S galena, which proves that sulfur isotopes in ore-forming fluid have reached equilibrium. The analysis of total sulfur isotopes suggests two groups of high temperature and low temperature data. The Pinckney diagram shows that the δ34SΣS is 1.28 ‰ in the middle and low temperature stages and 1.68 ‰, respectively, indicating that the sulfur isotopic composition of the ore-forming fluid has a small change, only 0.4 ‰. And its total sulfur isotopic composition is 1.78 ‰, all of which shows that the ore-forming fluids have mantle sulfur characteristics, indicating that the sulfur in the deposit might come from the mantle. |
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