云南会泽超大型铅锌矿床C、O同位素地球化学
CARBON AND OXYGEN ISOTOPE GEOCHEMISTRY OF THE HUIZE SUPERLARGE Pb-Zn ORE DEPOSITS IN YUNNAN PROVINCE
查看参考文献22篇
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文摘
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云南会泽超大型铅锌矿床规模大、品位富、伴生有用元素多,预示其成矿环境较为特殊.本文分析该矿床矿石中脉石矿物方解石和赋矿碳酸盐地层的C、O同位素组成,结果表明矿石中脉石矿物方解石的C、O同位素组成相对均一,不同矿体(不同标高)、不同产状以及相同矿体不同产状方解石的C、O同位素组成不具明显差别,其δ13CDB值和δ18OSMOW值分别为-2.1‰～-3.5‰(均值-2.8‰)和16.7‰～18.6‰(均值17.7‰),在δ13CPDB-δ18OSMOW图上集中于岩浆碳酸岩与海相碳酸盐岩之间的狭小范围内.多方面的证据表明:矿床成矿流体为壳-幔混合流体,其中壳源组分可能主要由矿区(或区域)碳酸盐地层提供,而幔源组分则可能与区域大面积峨眉山玄武岩岩浆活动过程中的去气作用有关. |
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其他语种文摘
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The Huize superlarge Pb-Zn ore deposit is characterized by its big scale, high contents of Pb + Zn and multiple concomitant elements, which shows that its ore-forming condition is relatively special. This paper analyzes the carbon and oxygen isotopic compositions of calcites occurring as gangue mineral in ores and in carbonate strata that host the ores. The results show that the carbon and oxygen isotopic compositions of the calcites are relatively homogeneous, and the carbon and oxygen isotopic compositions of the calcites that appear in different ore bodies, have different occurrences and the same ore body with varied occurrences are not obviously different from one an-other. The values of S13Cpdb and S1sOsmow of calcite range respectively from -2. \%o ~ -3. 5%o (the average value is - 2. 8%o) and 16. l%c ~ 18. 6%e (the average value is 17. l%c). In the 813Cpdb vs &18Osmow diagram, the samples are plotted in a small field between carbonatite and marine carbonate. A variety of evidences demonstrate that the ore-forming fluids are of the crustal-mantle mixing type, with the crustal compositions being mainly originated from the carbonate strata in the orefield, and the mantle compositions being related to the degassing process of the E-meishan basalt magmatism. |
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来源
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大地构造与成矿学
,2004,28(1):53-59 【核心库】
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关键词
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C、O同位素地球化学
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成矿流体
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云南会泽超大型铅锌矿床
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地址
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中科院贵阳地球化学所, 矿床地球化学开放实验室, 贵州, 贵阳, 550002
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云南会泽铅锌矿, 云南, 会泽, 654211
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中科院贵阳地球化学所, 中科院边缘海地质重点实验室, 贵州, 贵阳, 550002
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昆明理工大学国土资源工程学院, 云南, 昆明, 650093
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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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1001-1552 |
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学科
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地质学 |
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基金
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国家自然科学基金项目
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云南省科技厅省院省校科技合作项目
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文献收藏号
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CSCD:1655857
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