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西华山黑钨矿-石英脉绿柱石中熔融包裹体的成分 被引量:29

The composition of melt inclusions in beryl from wolframite-quartz veins in Xihuashan, Jiangxi Province
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摘要 借助高温高压技术与电子探针分析,首次获得黑钨矿-石英脉绿柱石中晶质熔融包裹体的主要成分。熔融包裹体的成分主要是SiO2和Al2O3(分别平均为70.72%和13.94%)及少量K2O(2.0%),其他氧化物含量甚低,并且含有大量的挥发分(主要是H2O,达11.56%)。激光拉曼光谱分析表明,熔融包裹体液相中CO2、H2S等含量不高(分别为7.8%和4.3%),气相部分主要是一些还原性气体。熔融包裹体代表HF-H2O-花岗岩体系结晶分异最后阶段残余熔融体的成分,证实脉钨矿床的成矿流体不是单一的热水溶液,而是硅酸盐熔体与超临界流体共存的岩浆-热液过渡性流体,其成矿作用始于岩浆-热液过渡阶段。 With the high-temperature-pressure technique, the crystalline melt inclusions (MI) in beryl from Xihuashan wolframite-quartz veins were homogenized and quenched into glasses. The glasses were analyzed by electron microprobe for the first time. It is shown that they are composed mainly of SIO2(70.72% ) and Al2O3 ( 13.94 % ), with minor K2O (2.0 % ) and extremely low other oxides. Melt inclusions contain a lot of dissolved volatile components (mainly H2O, up to 11.5 % ). The liquid-and gas phase of fluids in melt inclusions was analyzed by laser Raman microspectrometry, and the results indicate that CO2 and H2S contents are relatively low in liquid phase (CO2-7.8%, H2S-4.3% ), whereas gas phase consists mainly of reduced gas. The analyses of glasses represent the composition of residual melt at the final stage of crystallization differentiation in the granite- H2O-HF system. Melt inclusions coexisting with primary fluid inclusions in beryl from wolframite-quartz veins suggest that the ore-forming fluids were not only hydrothermal solution but also magmatic-hydrothermal transitional fluids composed of coexistent silicate melt and supercritical fluid, and mineralization began at the magmatic-hydrothermal stage.
出处 《岩石矿物学杂志》 CAS CSCD 北大核心 2007年第3期259-268,共10页 Acta Petrologica et Mineralogica
基金 南京大学内生金属矿床成矿机制研究国家重点实验室开放基金(09-03-09) 宜昌地质矿产研究所科研发展基金(K2002303)
关键词 黑钨矿-石英脉 绿柱石 熔融包裹体 成分 高温高压 电子探针 江西西华山 wolframite-quartz vein beryl melt inclusion composition high-temperature- pressure technique electron probe analysis Xihuashan, Jiangxi Province
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