内蒙古白乃庙石英脉群流体包裹体特征及其金的勘查意义

摘要/Abstract

摘要：

研究区位于内蒙古白乃庙—谷那乌素铜金成矿带，地质填图发现：白乃庙铜金矿床西侧徐尼乌苏组中发育一套石英脉群，产状与白乃庙矿区金矿化石英脉相似。其矿物组合可分为黄铁矿-石英早阶段（M1）和石英-方解石晚阶段（M2）。M1阶段捕获的流体包裹体中，含子晶三相包裹体均一温度为256～320 ℃，盐度为31.4%～39.8% NaCl _eqv；两相水溶液包裹体的均一温度为210～260 ℃时，盐度为17.1%～22.8% NaCl _eqv，气相富集CH₄，CO₂次之，含H₂S、H₂O及少量C₆H₆、N₂，温度为170～210 ℃时，气相富集H2O或CO₂，CH₄次之，含N₂，盐度与前者相似，但存在低盐度流体端员；纯气体包裹体成分为纯CH₄或者CO₂和CH₄。 M2阶段捕获两相水溶液包裹体，均一温度为90～160 ℃，盐度为15.82%～21.1% NaCl eqv，并与低盐度流体混合。石英脉群的流体可以看作中低温中低盐度含H₂S、N₂、C₆H₆的CH₄-CO₂-H₂O-NaCl体系。对比金矿床成矿流体、白乃庙铜金矿床流体特征并结合化学分析，表明石英脉群具有金矿化的潜力。

关键词: 流体包裹体；金矿化；石英脉群；白乃庙&mdash, 谷那乌素；内蒙古

Abstract:

The study area is located in a Cu-Au metallization belt in Bainaimiao-Gunawusu, Inner Mongolia. A set of quartz-vein group is found in the Xuniwusu Formation by recent geological mapping, distributing in the Shiertai area, west of Bainaimiao Cu-Au deposit, but exhibiting a large similarity with the gold metallization veins of Bainaimiao Cu-Au deposit. The mineral assemblage of the quartz-vein group can be divided into two stages: the early pyritequartz stage （M1） and the late quartz-calcite stage （M2）. In M1 stage, homogenization temperature of the three phase inclusion bearing daughter crystal is of 256-320 ℃, and salinity of 31.4%-39.8% NaCl_eqv. Homogenization temperature of the two-phase aqueous inclusion is of 210-260 ℃, and salinity of 17.1%-22.8% NaCl_eqv, and CH₄ enriched, less CO₂, H₂O , and small amount of H₂S, C₆H₆, N₂at gas phase composition; whereas by temperature of 170-210 ℃, CO₂ or H₂O enriched, less CH₄, and minor N₂, the salinity is as much as that of the former, but with participation of low salinity end-member. The CH₄ and CO₂ or only CH₄ is shown by the pure gas inclusion. In M2 stage, homogenization temperature of two-phase aqueous inclusions is of 90-160 ℃, salinity of 15.82%-21.1% NaCl eqv, and the two-phase aqueous inclusion has a mixture with low salinity fluid. It is proposed that fluids of quartzvein group should be regarded as aCH₄-CO₂-H₂O-NaClsystem in the low salinity and low temperature with a small amount of H₂S and N₂, C₆H₆. In comparison with gold ore-forming fluid, fluid inclusion of Bainaimiao Cu-Au deposit, and data of chemical analysis of quartz-vein group, we suggest that the quartz-vein group would be a potential exploration target of gold metallization.

Key words: fluid inclusion, gold mineralization, quartz-vein group, Bainaimiao-Gunawusu, Inner Mongolia

中图分类号:

P618.51

王必任,周志广,於炀森,那福超,肖茹鹏. 内蒙古白乃庙石英脉群流体包裹体特征及其金的勘查意义[J]. 现代地质, 2011, 25(2): 243-252.

WANG Bi-Lin,ZHOU Zhi-Guan,YU Yang-Sen,NA Fu-Chao,XIAO Ru-Feng. Fluid Inclusions of Quartz-vein Group in the Bainaimiao Area, Inner Mongolia, and Its Significance in Exploring Gold Mineralization[J]. Geoscience, 2011, 25(2): 243-252.

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