湘黔汞矿带脉石矿物方解石稀土元素、碳氧同位素特征及其指示意义
Characteristics and Implications of REE, Carbon and Oxygen Isotopes of Hydrothermal Calcite from the M ercury M etallogenic Belt in Hunan and Guizhou Provinces, China
查看参考文献22篇
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文摘
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方解石是湘黔汞矿带的主要脉石矿物. 湘黔汞矿带各矿床方解石的稀土配分模式均为轻稀土富集的右倾型, 中段的大硐啦、茶田方解石和围岩的稀土配分模式比较相似, 只是稀土总量有差别;南段的万山方解石和围岩的稀土配分模式则不一致, 围岩的稀土总量反而要高于方解石. 南段的万山方解石稀土具有弱的负Eu、负Ce异常;而中段的大硐喇、茶田方解石具有负Eu、正Ce异常. 其中, 作为示踪流体过程重要参数的Y/Ho比值在湘黔汞矿带南段与中段的方解石中也有着较大的差别. 方解石的C、O同位素特征揭示南段万山汞矿的形成与古油藏的有机质有关, 而中段大硐喇、茶田汞矿的形成则与有机质无关. 这都说明了南段与中段无论是成矿物理化学环境还是成矿热液流体的性质等都存在着较大差别. |
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其他语种文摘
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Hydrothermal Calcites are of main gangueminerals in themercury metallogenic belt in Hunan and Guizhou Provinces, China.REE geochemical studies on hydrothermal calcites from three mainmercury ore fields (Wanshan, Chatian and Dadongla) showed smi ilarchondrite-normalized REE distribution patterns with LREE-enriched and rightinclined type. However, in comparisonwith host rocks, the total REE patterns are different with each other.In the middle section of mercury metallogenic belt, smi ilar REE distribution patterns were observed between calcites and host rock from Chatian and Dadongla ore fields, although with the slightly difference in the totalREE abundances.In the south section of themetallogenic belt, it showed not only distinct REE patterns between calcites and host rocks from Wanshan ore filed, but also higherREE abundances in host rocks compared with calcites.In addition, In the Wanshan ore field, calcites showedweak negative Eu and Ce anomalies; while in Dadongla and Chatian ore fileds, calcites showed negativeEu anomalies and positiveCe anomalies. TheY/Ho ratio ofcalcites from three ore fields, as the mi portantparameter to trace ore fluid, also presented smi ilar trend. Carbon and Oxygen isotopes of calcites revealed that the mineralization of the Wanshan ore fieldwas closely relatedwith organic matter of the ancientoil reservoirs, while itwas decoupled between Mercury mineralization and organicmatter of Dadongla and Chatian ore fields. Therefore, both physical chemicalenvironmentofmineralization and the nature of the ore-forminghydrothermal fluids are quite different in the whole Mercury ore belt as suggested in this paper. |
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来源
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矿物学报
,2010,30(2):185-193 【核心库】
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关键词
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湘黔汞矿带
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方解石
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稀土元素
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C、O同位素
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流体性质
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地址
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1.
中国科学院研究生院, 矿床地球化学国家重点实验室, 北京, 100049
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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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1000-4734 |
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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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文献收藏号
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CSCD:3914304
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