南秦岭钡成矿带重晶石与毒重石成矿特征

现代地质 ›› 2010, Vol. 24 ›› Issue (2): 237-244.

南秦岭钡成矿带重晶石与毒重石成矿特征

吴胜华^{1, 2}, 刘家军^{1, 2}, 张鼐³, 柳振江^{1, 2}

1.中国地质大学,地质过程与矿产资源国家重点实验室, 北京100083; 2.中国地质大学,地球科学与资源学院, 北京100083; 3.中国石油勘探开发研究院，北京100083

出版日期:2010-04-20 发布日期:2010-05-10
通讯作者: 刘家军，男，教授，博士生导师，1963年出生，矿物学、岩石学、矿床学专业，主要从事矿床地球化学方面研究。Email: liujiajun@cugb.edu.cn。
作者简介:吴胜华，男，硕士研究生，1983年出生，矿物学、岩石学、矿床学专业，主要从事矿床地球化学方面研究。 Email: shenghuage@sina.com
基金资助:
国家自然科学基金项目(40573032)；国家重点基础研究发展规划项目(2006CB403500)；高等学校学科创新引智计划项目(B07011)；长江学者和教育部创新团队发展计划。

Metallogenic Characteristics of Barite and Witherite of the Barium Metallogenic Belt in Southern Qinling Mountains

TUN Qing-Hua ^{1, 2}, LIU Jia-Jun^{1, 2} , ZHANG Nai³, LIU Zhen-Jiang^{1, 2}

1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China;
2. School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China;
3. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing100083, China

Online:2010-04-20 Published:2010-05-10

摘要/Abstract

摘要：

在我国扬子地块北缘南秦岭一带的早古生代硅质岩建造中，存在一大批重晶石矿床和毒重石矿床，构成世界上极为罕见的大型钡成矿带。根据流体包裹体显微测温分析，重晶石流体包裹体均一温度峰值低于毒重石流体包裹体峰值。这些矿床中重晶石的δ³⁴S值比同期海水δ³⁴S值高（除去文峪矿区重晶石一个δ³⁴S值与同期海水δ³⁴S值接近），表明当时细菌对硫酸盐的还原作用引起了重S的富集。各钡矿床中的毒重石有各自的δ¹³C和δ¹⁸O值范围，毒重石中的C来自有机质事件反应。根据热力学计算表明，小于162.42 ℃的温度有利于形成重晶石矿石；在温度高于162.42 ℃时，海水中积累充足的CO₃^2- （来自有机事件）有利于形成毒重石矿石。在重晶石矿床形成的晚期，如出现贫Ba²⁺热液，且海水中积累足够的CO₃^2- 和温度高于162.42 ℃，CO₃^2- 可以交代重晶石中的SO₄^2-形成交代成因的毒重石。

关键词: 南秦岭, 重晶石, 毒重石, 流体包裹体, S、C和O稳定同位素

Abstract:

More than 70 witherite and barite deposits (or points) are located in Southern Qinling Mountains, which is a unique large Ba metallogenic belt in the world. By microthermometry analysis, the peak of fluid inclusions homogeneous temperature has a increasing trend from barite to witherite. The δ³⁴S values of barite of the deposits are higher than those of the same period water of ocean basin (except one δ³⁴S value of barite of Wenyu deposit, which is close to those of the same period water of ocean basin),which shows that the ³⁴S enrichment in barite could be due to the reduction from germs to sulfate.Witherite deposits of Southern Qinling exist different ranges of δ¹³C and δ¹⁸O value, and C of witherite comes from reaction of organic matter.According to thermodynamics data, temperatue below 162.42 ℃ is favourable to forming barite ore;when temperature is over 162.42 ℃, and there is enough CO₃^2- (from reaction of organic matter), it is favourable to forming witherite in sea water.In the late period of forming barite deposits,if Ba²⁺ appears deficient in hydrotherm, and CO₃^2- (from reaction of organic matter)is enough and temperature is over 16242 ℃ in sea water,CO₃^2- will metasomate the SO₄^2- of barite to form metasomatic type witherite.

Key words: Southern Qinling, barite, witherite, fluid inclusion, S, C and O stable isotope

中图分类号:

P619.25⁺1

吴胜华, 刘家军, 张鼐, 柳振江. 南秦岭钡成矿带重晶石与毒重石成矿特征[J]. 现代地质, 2010, 24(2): 237-244.

TUN Qing-Hua, LIU Jia-Jun, ZHANG Nai, LIU Zhen-Jiang. Metallogenic Characteristics of Barite and Witherite of the Barium Metallogenic Belt in Southern Qinling Mountains[J]. Geoscience, 2010, 24(2): 237-244.

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