地质与勘探2018，Vol.54Issue(1)：82-89,8.
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
摘要
Abstract
Total sulfur isotope composition (ΣS) of metallogenic hydrothermal fluid can reflect the source of sulfur in the ore-forming fluid more ac-curately. This work studies the sulfur isotopes and total sulfur isotope in the Baoshan deposit of Hunan Province. The results show that the most δ34S val-ues of the metal sulfide samples are positive,changing in 6.40 ‰ ~ 6.91 ‰,generally -1.00 ‰ ~ 4.57 ‰,with average 2.22 ‰. Of them pyrite δ34S ranges in -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 δ34SΣSis 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 comes from the mantle.关键词
热液总硫/硫同位素/岩浆硫/分馏平衡/宝山/湖南Key words
hydrothermal total sulfur/sulfur isotope/magma sulfur/fractionation balance/Baoshan/Hunan Province分类
天文与地球科学引用本文复制引用
章勇,罗建镖,孔华,全铁军,奚小双..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):82-89,8.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. （编号:1212011121116）
