大河边－新晃超大型重晶石矿床地球化学特征及形成的地质背景
Geochemical characteristics of Dahebian-Gongxi superlarge barite deposits and analysis on its background of tectonic geology, China
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文摘
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本文从矿物岩石学、地球化学和沉积盆地分析角度，研究贵州天柱大河边－湖南贡溪两个超大型重晶石矿床中重晶石（矿）岩及其共生岩石的地球化学特征及构造地质背景。天柱－新晃－玉屏寒武纪热水沉积成矿盆地是发育在大陆斜坡上的断陷型热水沉积成矿盆地，由于同生断层作用将盆地切割成一系列次级盆地，大河边－碧林及龙背－铜盆盖三级热水沉积成矿盆地是大型重晶石矿床的构造定位空间。重晶石矿层主要赋存于下寒武统牛蹄塘组第一岩性段的黑色岩系中。 重晶石矿层是由海底低温热水同生沉积作用形成（105－192℃），古热水场的地球化学类型为硫酸盐型热水。硫酸盐型热水发生大规模同生沉积成岩成矿作用形成超大型重晶石矿床，重晶石矿层之上的黑色碳质粘土岩可能形成于封闭、还原、滞流的深水沉积环境，黑色碳质粘土岩构成矿层的封闭保存条件。 |
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其他语种文摘
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The Dahebian-Gongxi superlarge barite deposits located in the southern margin of the Yangtze massif are the first world-class barite deposits. China is the largest producer of barite and has the largest barite ore reserves. The potential reserves of barite ores (470 * 10~6 tons) in the Dahebian-Gongxi barite ore field is more than total barite ore reserves of other countries (326 * 10~6 tons) in the world. Why did this non-conventional superlarge barite deposit occur in this area? This scientific question is worthwhile to be probed into. From the view of mineral-petrology, geochemistry and analysis of hydrothermal basin, geological and geochemical characteristics and environments of hydrothermal deposition for barite ores and related rocks have been discussed in this paper. Firstly, the third-order, fault-controlled basin may probably provide enough ore-hosted space for the superlarge barite deposits. The Tianzhu-Xinhuang-Yuping Cambrian sedimentary basins with hydrothermal deposition at large-scale occurred on the continental slope were probably the kind of fault-controlled sedimentary basin with hydrothermal deposition. Due to snysedimentary faulting, the Tianzhu-Xinhuang-Yuping Cambrian sedimentary basins were most likely cut into a series of sub-basins. The Dahebian-Bilin and Longbei-Tongpengai third-order basins were the tectonically located space coupled with ore-hosted space produced by the syn-faulting at the same time for the superlarge barite deposits. Secondly, a relatively stable sedimentary environment was likely answered for hydrothermal deposition at large-scale. The deposits hosted in the black shales, which are attached to the first rock unit of the Lower Cambrian Niutitang Group, were possibly formed in a deep-sea, euxinic environment. The ore-layers of barite in the study area were reasonably formed by syn-deposition of low-temperature (150 - 190 ℃) hydrothermal waters at large-scale on sea floor. Geochemical type of paleo-hydrothermal waters may attach to sulfosalt-type hydrothermal waters. Finally, the black shales overlying the barite layer that was formed in a high salinity, limited, reduced, stagnant deep-water basin were a better preservation for the deposits. |
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来源
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岩石学报
,2002,18(2):247-256 【核心库】
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关键词
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重晶石矿床
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地球化学特征
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地质背景
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热水沉积成矿盆地
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地球化学
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中国
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成矿作用
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地址
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1.
有色金属矿产地质调查中心, 北京, 100814
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有色金属矿物地质调查中心, 北京, 100814
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0569 |
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学科
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地质学 |
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基金
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国家973计划
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国家自然科学基金国家杰出青年科学基金
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中国科学院重大项目（KZ-951-B1-411）及95-预-25联合资助
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文献收藏号
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CSCD:1077794
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