广西大厂矿田亢马锡多金属矿床流体包裹体地球化学
Fluid Inclusion Study on Kangma Tin-Polymetallic Deposit in Dachang Ore Field, Guangxi Province, China
查看参考文献40篇
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文摘
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广西大厂矿田产有世界级的超大型锡多金属矿床。亢马锡多金属矿床位于大厂矿田的东成矿带内,矿体主要呈脉状产出于泥盆系黑色页岩中。本文在扫描电镜-X射线激发荧光(SEM-CL)图像分析的基础上,重点对亢马矿床主成矿期锡石-硫化物和碳酸盐-硫盐阶段流体包裹体岩相学、显微测温学及其气相成分的激光Raman光谱进行了系统研究。结果表明,主成矿期锡石-硫化物阶段石英中主要发育富含CO_2气相包裹体和含子晶流体包裹体组合,其均一温度和盐度分别为304~392 ℃、3%~8%和314~420 ℃、36%~48%。成矿晚期碳酸盐-硫盐阶段方解石中则仅发育气-液两相盐水流体包裹体,具有较低的均一温度(108~197 ℃)和盐度(6%~12%)。主成矿期锡石-硫化物阶段富含CO_2气相与含子晶流体包裹体共存、具相近的均一温度以及不同的盐度,推测锡石-硫化物阶段成矿流体经历了流体不混溶(沸腾)过程,流体相分离导致Sn等成矿元素以氯络合物形式进入高盐度的卤水相,其氧化-还原过程可能是导致锡石和硫化物沉淀富集最重要的成矿机制,而成矿晚期碳酸盐阶段的流体可能主要来源于富含CO_2气相流体的冷凝过程。 |
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其他语种文摘
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Dachang district, Guangxi Province, China, has one of the largest tin-polymetallic ore field in the word. Kangma deposit is located at the eastern part of Dachang ore field and the orebodies mainly occur as veins hosted in Devonian black shale. Petrography, microthermometry, and laser Raman spectroscopy, combined with scanning electron microscope cathodoluminescence (SEM-CL) analyses of fluid inclusions were used to characterize the chemical evolution of ore fluids in Kangma deposit. Results show that quartz associated with the main ore stage of cassiterite-sulfides veins only contains two-phase, CO_2 vapor-rich and daughter-bearing fluid inclusion assemblages. The vapor-rich fluid inclusion assemblage yield homogenization temperatures of 304-392 °C and salinities of 3%-8% NaCl equiv. The daughterbearing inclusion assemblages have similar range of homogenization temperatures of 314-420 °C, but high salinities of 36%-48% NaCl equiv., whereas the fluid inclusions in calcite associated with the late ore stage of carbonate-sulfosalt veins are only two-phase, liquid-rich aqueous fluid inclusions, with low homogenization temperatures of 108-197 °C and medium salinities of 6%-12% NaCl equiv. The coexistence, similar homogenization temperature, contrasting salinity of vapor-rich and daughter-bearing fluid inclusion assemblages in the main ore stage of cassiterite-sulfides indicate that boiling and redox of ore fluids are key process for deposition of cassiterite and sulfides. The late ore fluids may be sourced from cooling and contraction of vapor phase of the main stage to liquid that deposited carbonates and sulfosalts in the late ore stage. |
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来源
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矿物学报
,2017,37(6):746-754 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2017.06.009
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关键词
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流体包裹体
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成矿流体演化
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亢马锡多金属矿床
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广西大厂矿田
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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, 550081
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广西南丹南国矿业有限责任公司, 广西, 南丹, 547200
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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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国家自然科学基金项目
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文献收藏号
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CSCD:6202251
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