| 四川会东小街金矿床成矿机理分析 |
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| 引用本文： | 王小春,郑明华.四川会东小街金矿床成矿机理分析[J].黄金地质,2000,6(2):9-16. |
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| 作者姓名： | 王小春 郑明华 |
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| 作者单位： | [1]中国科学院地球化学研究所,贵州贵阳 [2]西南冶金矿产勘查开发院,四川成都 |
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| 基金项目： | 国家攀登预选项目 !( 95-预 - 2 5)资助 |
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| 摘 要： | 四川会东小街金矿床为川西产于元古宙绿片岩地层中的菱铁矿型金矿床的典型代表。金矿体呈脉状产于中元古界会理群青龙山组碳质板岩、流纹质凝灰岩、变粗面炭和花岗斑岩的内外接触带中，受ＥＷ向基底断裂的次级断裂和层间破碎带的严格控制。矿石矿物组合为黄铁矿、毒砂、黄铜矿、黔铜矿族、Ａｕ－Ａｇ系列矿物，石英和菱铁矿。其成矿元素组成为Ａｕ－Ｃｕ－Ａｇ－Ｐｂ－Ｓｂ－Ａｓ－Ｆｅ。围岩蚀变以硅化、粘土化和碳酸盐化（菱铁矿化
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| 关 键 词： | 金矿床 成矿机理 四川 |
Ore forming mechanism analysis on Xiaojie gold deposit in Huidong, Sichuan |
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| WANG Xiao chun ,ZHENG Ming hua ,ZHANG Zhe ru.Ore forming mechanism analysis on Xiaojie gold deposit in Huidong, Sichuan[J].Gold Geology,2000,6(2):9-16. |
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| Authors: | WANG Xiao chun ZHENG Ming hua ZHANG Zhe ru |
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| Institution: | WANG Xiao chun 1,2,ZHENG Ming hua 3,ZHANG Zhe ru 1 |
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| Abstract: | Xiaojie gold deposit in Huidong, Sichuan is a typical Proterozoic greenschist hosted Au siderite one. Gold ore bodies occur as vein in inner and outer contact zones among granite porphyrite and carbonaceous slate, rhyolitic tuff, and meta trychyte in Qinglongshan Formation of Middle Proterozoic Huili Group, which are strictly controlled by subsidiary faults and interstratified fractured belts of EW trending regional basement fault. Gold ores have a mineral association of pyrite, arsenopyrite, chalcopyrite, tetrahedrite, Au Ag series minerals, quartz and siderite, and element association of Au, Cu, Ag, Pb, Sb, As and Fe. Wallrock alterations are mainly silicification, argillization, and carbonatization (sideritization, calcitization). It can be inferred from the REE, isotope, and fluid inclusion studies that ore forming materials are mainly derived from the slate and phyllite in Qinglongshan Formation, the mineralized fluid may be chiefly magmatic water. The gold bearing quartz veins were probably formed during Chengjiang period. The deposit was formed by the low density, intermediate salinity, alkalescent or less alkalescent fluid in reductive epithermal environment. It belongs to magmatic hydrothermal reworked gold deposit, which experienced volcanic exhalation sedimentary and regional matamorphic preenrichment. |
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| Keywords: | gold deposit ore forming mechanism west of Sichuan |
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