| 新疆阿合奇县布隆金矿床成矿流体及成矿作用 |
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| 引用本文： | 杨富全,毛景文,王义天.新疆阿合奇县布隆金矿床成矿流体及成矿作用[J].地学前缘,2004,11(2):501-514. |
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| 作者姓名： | 杨富全 毛景文 王义天 |
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| 作者单位： | 中国地质科学院,矿产资源研究所,北京,100037;中国地质科学院,矿产资源研究所,北京,100037;中国地质科学院,矿产资源研究所,北京,100037 |
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| 基金项目： | 国家重点基础研究发展规划项目 ( 2 0 0 1CB 40 980 7，G19990 43 2 16) |
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| 摘 要： | 新疆阿合奇县布隆石英重晶石脉型金矿床是一个少见的金矿新类型 ,其中流体包裹体类型主要有NaCl H2 O型、CO2 H2 O±CH4型和CO2 H2 O NaCl型。均一温度变化范围大 ,从 1 5 9～ 390℃ ,金主成矿阶段温度集中于 2 0 0～ 340℃ ,流体盐度为 2 .4 2 %～ 1 9.2 9%NaCleq ,但各阶段含石盐子晶多相包裹体的盐度高达 2 9.0 2 %～ 4 6 .2 %NaCleq。成矿流体密度为 0 .731～ 1 .1 32g/cm3 。成矿流体气相成分中以H2 O和CO2 为主 ,含少量N2 ,CH4,C2 H6,H2 S等 ;液相成分以Na+ 、Cl-为主 ,其次是Ca2 + ,K+ ,Mg2 + ,SO2 -4。布隆金矿床石英中流体包裹体的δ1 3 CPDB值为 - 4 .6‰～ - 1 .4‰ ,δ1 8OSMOW 为 1 7.2‰～2 1 .1‰ ,δ1 8O水 值为 6 .7‰～ 1 4 .7‰ ,δD变化于 - 70‰～ - 5 5‰ ,表明成矿流体主要来源于建造水 ,并混合少量岩浆水和大气降水 ,流体中的碳主要来源于海相碳酸盐岩。物理化学条件和流体组成的改变以及流体的不混溶作用在成矿过程中起了重要作用
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| 关 键 词： | 金矿床 成矿流体 碳氢氧同位素 成矿作用 布隆 新疆 |
| 文章编号： | 1005-2321(2004)02-0501-14 |
| 修稿时间： | 2003年3月3日 |
THE ORE-FORMING FLUIDS AND METALLOGENESIS OF THE BULONG GOLD DEPOSIT IN AKQI COUNTY, XINJIANG |
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| YANG Fu-quan,MAO Jing-wen,WANG Yi-tian.THE ORE-FORMING FLUIDS AND METALLOGENESIS OF THE BULONG GOLD DEPOSIT IN AKQI COUNTY, XINJIANG[J].Earth Science Frontiers,2004,11(2):501-514. |
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| Authors: | YANG Fu-quan MAO Jing-wen WANG Yi-tian |
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| Abstract: | The Bulong gold deposit is a quartz-barite vein type gold deposit in Xinjiang. Three types of fluid inclusions, namely NaCl-H_2O inclusions, CO_2-H_2O±CH_4 inclusions and CO_2-H_2O-NaCl inclusions have been found. The temperatures of homogenization of the fluid inclusions vary remarkably from 159 ℃ to 390 ℃, whereas the ore-forming temperatures mostly range from 200 ℃ to 340 ℃ in the main stage of gold mineralization . The salinities of fluids range from 2.42 wt% NaCleq to 19.29 wt% NaCleq, but highly salinities are 29.02 wt% NaCleq to 46.2 wt% NaCleq in NaCl daughter mineral bearing inclusions in various stages. The densities of ore-fluids range from 0.731～1.132 g/cm~3. The gas components of fluid inclusions are mainly H_2O and CO_2, with minor amounts of N_2,CH_4,C_2H_6,H_2S,etc.The liquid components of fluid inclusions are mainly Na~+, Cl~-; the Ca~(2+),K~+,Mg~(2+), and SO~(2-)_4 are less abundant. The δ~(13)C_(PDB) values of fluid inclusions in quartz of the Bulong gold deposit vary in a narrow range of (-4.6‰) to -1.4‰. The (δ~(18)O_(SMOW)) values of quartz range from +17.2‰ to +21.1‰, their corresponding (δ~(18)O_(water)) values are +6.7‰ to +14.7‰, and the δD values of fluid inclusions of the quartz are -70‰ to -55‰. The data imply that the ore-forming fluids of the Bulong gold deposit were mainly derived from the formation water and were mixed with a small amount of the magmatic water and meteoric water. The carbon in ore fluid mainly came from the marine carbonates. The changes of physicochemical conditions, the fluid compositions in the ore-forming fluids and the immiscibility of CO_2-H_2O had main effect in the forming process of the Bulong gold deposit. |
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| Keywords: | gold deposit ore-forming fluid C-H-O isotope metallogenesis Bulong Xinjiang |
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