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现代地质 ›› 2013, Vol. 27 ›› Issue (1): 46-55.

• 矿床学与地球化学 • 上一篇    下一篇

贵州镇宁泥盆系大型重晶石矿床地球化学特征及其成因研究

高军波1，杨瑞东1，陶平2，魏怀瑞1，刘坤1，程伟1   

  1. 1贵州大学 资源与环境工程学院，贵州 贵阳550003； 2贵州省地质调查院，贵州 贵阳550004
  • 收稿日期:2012-02-10 修回日期:2012-11-05 出版日期:2013-01-16 发布日期:2013-01-17
  • 通讯作者: 杨瑞东，男，教授，博士生导师，1963年出生，矿床学专业，主要从事沉积矿床及沉积地球化学的教学和研究工作。
  • 作者简介:高军波，男，博士研究生，1985年出生，矿床学专业，从事沉积型矿床研究工作。Email: gaojunbo1985@126.com。
  • 基金资助:

    教育部博士点基金项目(20105201110002)；贵州省地质矿产勘查开发局2009年度重大科研项目“水城—紫云—南丹晚古生代裂陷作用及其与主要矿产的关系”；贵州省长基金和贵州大学博士点学科建设基金项目。

Geochemical Characteristics and Genesis of Large Devonian Barite Deposits in Zhenning County, Guizhou Province

GAO Jun-bo1，YANG Rui-dong1，TAO Ping2，WEI Huai-rui1，LIU Kun1，CHENG Wei1   

  1. 1College of Resources and Environmental Engineering，Guizhou University，Guiyang, Guizhou550003, China;
    2Guizhou Geological Survey, Guiyang, Guizhou550004, China
  • Received:2012-02-10 Revised:2012-11-05 Online:2013-01-16 Published:2013-01-17

PDF (PC)

3368

被引次数

21

摘要：

水城—紫云—南丹深断裂是跨越黔桂两省较为闻名的断裂带，沿断裂带两侧分布一系列矿床类型，贵州镇宁泥盆系大型重晶石矿床位于北西侧。对镇宁大型重晶石矿床的沉积学、地球化学及成矿背景的研究发现，矿石中发育纹层状构造、条带状构造、角砾状构造、碎屑状构造和厚层块状构造等热水沉积构造，常量元素特征揭示该矿床可能形成于以SiO2及含矿硫酸盐流体的同生混合沉积作用。重晶石矿(岩)石中Sr、Zn和W明显富集，显示热水沉积特征，且该重晶石矿(岩)石在lg U-lg Th和Cr-Zr相关图解上也均显示热水沉积特征。稀土配分模式富集轻稀土，δEu表现正异常，δCe表现负异常，具热水喷流成矿特征。因此，认为镇宁大型重晶石矿属海底热水喷流沉积形成的产物。

关键词: 热水喷流, 地球化学, 重晶石矿床, 泥盆系, 贵州

Abstract:

Shuicheng-Ziyun-Nandan deep fault is a well-known belt expanding across two provinces (Guizhou and Guangxi), along both sides distributing a series of diverse deposit types, and the large Devonian barite deposit is an important ore deposit in Zhenning County, Guizhou. The large barite deposit, located in the northwest margin of Shuicheng-Ziyun-Nandan deep fault was studied on the basis of the sedimentation characteristics, geochemistry and metallogenic background. The results revealed coexistence of a variety of hydrothermal water sedimentary structures characteristics such as laminar structures, barite-banded structure, brecciated structure, barite-fragmental structure, massive structure, and so on. Macroelement study indicated that the  deposit was formed probably by synsedimentation of SiO2 and ore-bearing sulfate fluid. Besides, geochemistry of the large barite deposits of the Devonian shows the enrichment of Sr, Zn and W, strongly suggesting that the barite deposits is hydrothermal sedimentation in origin. The diagrams of lgU-lgTh and Cr-Zr in the barite deposit also present the features of hydrothermal sedimentation. According to the REE distribution pattern, LREE were enriched and Eu was positive while Ce was negative, which also shows a hydrothermal feature. As a result, we believed that the large barite deposits located in Zhenning formed by hydrothermal exhalative mineralization.

Key words: hydrothermal exhalation, geochemistry, barite deposit, Devonian, Guizhou Province

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