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| 云南澜沧老厂大型银多金属矿床碳、氧同位素组成及其意义 | |
| 引用本文： | 龙汉生,罗泰义,黄智龙,周明忠,杨 勇,钱志宽.云南澜沧老厂大型银多金属矿床碳、氧同位素组成及其意义[J].矿床地质,2009,28(5):687-695. |
| 作者姓名： | 龙汉生 罗泰义 黄智龙 周明忠 杨 勇 钱志宽 |
| 作者单位： | 1. 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;中国科学院研究生院,北京,100049 2. 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 3. 贵州师范大学地理与生物科学学院,贵州贵阳,550001 |
| 基金项目： | 国家重点基础研究发展计划资助项目，中国科学院知识创新工程，中国科学院地球化学研究所与云南澜沧铅矿合作项目的联合资助 |
| 摘 要： | 文章系统研究了老厂矿床的碳酸盐围岩和成矿方解石的碳、氧同位素组成.研究表明,相对于区域地层,矿区碳酸盐岩围岩普遍亏损18O;成矿方解石的碳氧同位素总体上具有明显的正相关性,这些特征表明成矿流体与围岩发生了大规模的水岩反应.文章初步建立了水岩反应的理想模式,根据该模式进一步将成矿方解石划分为矿体中心相和边缘相2组.水岩反应理论模拟表明:总体上成矿流体中的可溶性碳以H2CO3为主,中心相成矿流体的δ13C、δ18O值分别为-5.5‰和+4‰,具有典型深部岩浆流体的特征;边缘相成矿流体的δ13C、δ18O值分别为-1.5‰和+4‰,代表了深部岩浆流体与下渗天水共同交代碳酸盐岩围岩后的碳、氧同位素特征. |
| 关 键 词： | 地球化学 碳、氧同位素 成矿流体 水岩反应 银多金属矿床 老厂 云南 |
Carbon and oxygen isotopic geochemistry of Laochang large-sized Ag polymetallic deposit in Lancang, Yunnan Province and its significance |
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| LONG HanSheng,LUO TaiYi,HUANG ZhiLong,ZHOU MingZhong,YANG Yong,QIAN ZhiKuan.Carbon and oxygen isotopic geochemistry of Laochang large-sized Ag polymetallic deposit in Lancang, Yunnan Province and its significance[J].Mineral Deposits,2009,28(5):687-695. | |
| Authors: | LONG HanSheng LUO TaiYi HUANG ZhiLong ZHOU MingZhong YANG Yong QIAN ZhiKuan |
| Abstract: | Carbon and oxygen isotopic compositions of carbonate host rocks and ore-forming calcite in the Laochang Ag polymetallic deposit of Yunnan Province were studied. The restdts suggest that limestone in the ore district is obviously depleted in ~(18)O relative to the cor-responding strata in this area, and that there exists an obvious positive relation between carbon and oxygen isotopes in ore-forming cal-cites. The C and O isotope evolution suggests that drastic water-rock interaction took place at the ore-forming stage. An ideal water-rock interaction model has been proposed for the C and O isotope evolution. Ore-forming calcite is classified into two groups, with one being the mineralization core phase and the other being the mineralization rim phase. Theoretical simulation of C and O isotope of fluid-rock interaction shows that the dominant dissolved carbon species in the ore-forming fluid are H_2CO_3, and that the δ~(13)C and δ~(18)O of ore-forming hydrothermal fluids of the core phase and the rim phase are - 5.5‰, + 4‰, and - 1.5‰, + 4‰, respectively. The ore-forming hydrothermal fluid of the core phase calcite was derived from magmatic water, whereas the ore-forming hydrothermal fluid of the rim phase calcite was produced by the interaction between the magmatic water and meteorite water and the carbonate host rocks. |
| Keywords: | geochemistry oxygen and carbon isotopic composition ore-forming fluid modeling of fluid-rock imeraction Ag polymetallic deposit Laochang Yunnan |
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