湖北徐家山锑矿床方解石C、O、Sr同位素地球化学
Carbon, oxygen and strontium isotope geochemistry of calcites from Xujiashan antimony deposit, Hubei Province
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文摘
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湖北通山的徐家山锑矿床产在上震旦统陡山沱组和灯影组的海相碳酸盐岩中.对该矿床中成矿前和成矿期方解石进行了较系统的C、O、Sr同位素地球化学研究,结果表明,成矿前方解石具相对较高的δ~(13)CPDB(-0.7‰～+2.0‰)、δ~(18)OSMOW(+18.6‰～+19.6‰)和Sr含量(2645-8174 μg/g,平均5656μg/g),及较低的~(87)Sr/~(86)Sr比值(0.7096～0.7097);而成矿期方解石具相对较低的δ13CPDB(-3.9‰～-2.1‰)、δ~(18)OSMOW(+11.5‰～+15.3‰)、Sr含量(785～2563μg/g,平均1571μg/g),和较高的~(87)Sr/~(86)Sr比值(O.7109～0.7154,平均0.7141).分析认为,成矿前方解石的C、O和绝大部分Sr来源于赋矿围岩--震旦系海相碳酸盐岩;而成矿流体为富H_2CO_3的溶液,它来自或流经富放射成因87Sr的下伏基底碎屑岩--中元古界冷家溪群浅变质岩;该流体与围岩发生水.岩反应导致成矿期方解石和辉锑矿的沉淀. |
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其他语种文摘
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The Xujiashan antimony deposit is located at Tongshan County, Hubei Province, and its antimony mineralization occurs in the marine carbonates of Upper Sinian Doushantuo Formation and Dengying Formation. The carbon, oxygen and strontium isotopic compositions of calcites developed during both pre- and syn- mineralization at this deposit are determined in this study. The results show that the pre- mineralization calcites display relatively high δ ~(13)CPDB (- 0.7‰ ～ + 2.0‰ ) and δ~( 18)OSMOW values (+ 18.6‰ ～ + 19.6‰ ), and low ~(87)Sr/~(86)Sr ratios (0.7096～ 0.7097) with high Sr concentrations ranging from 2645 to 8174 μ g/g and an average of 5656 μ g/g. Whereas the syn- mineralization calcites have relatively low δ ~(13)CPDB (- 3.9‰ ～ - 2.1‰ ) and δ 18OSMOW values (+ 11.5‰ ～ + 15.3‰ ), but high 87Sr/86Sr ratios (0.7109～ 0.7154, with an average of 0.7141) with low Sr concentrations varying from 785 to 2563 μ g/g and an average of 1571 μ g/g. It was revealed that the carbon, oxygen, and predominant Sr of the pre- mineralization calcites might be directly come from the host rocks, the Sinian marine carbonates. The ore- forming fluid characterized by H_2CO_3- enriched was probably derived from or flowed through the underlying radiogenic Sr- enriched clastic basement, the low- grade metamorphic rocks of Mesoproterozoic Lengjiaxi Group. It is suggested that the precipitation of the syn- mineralization calcite and the intergrown stibnite in the Xujiashan antimony deposit resulted from fluid- rock interaction between host rocks (the Sinian marine carbonates) and fluids from underlying clastic basement (the low- grade metamorphic rocks of Lengjiaxi Group).
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来源
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地球化学
,2007,36(5):479-485 【核心库】
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关键词
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方解石
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C、O、Sr同位素
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成矿流体
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徐家山锑矿床
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湖北省
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地址
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中国科学院,地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
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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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0379-1726 |
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学科
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地质学 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:2932101
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