第25卷第2期 2011年4月
现代地质 GEOSCIENCE
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
王必任，周志广，於炀森，那福超，肖茹鹏
（中国地质大学地球科学与资源学院，北京100083）
Vol. 25
Na. 2 Apr.2011
摘要：研究区位于内蒙古白乃庙一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256~320C，盐度为31.4%~39.8%NaCleqV；两相水溶液包裹体的均一温度为210~260℃时，盐度为17.1%~22.8%NaCIeqV，气相富集CH，，CO,次之，含H,S、 H,O及少量C,H、N，温度为170~210℃时，气相富集H,O或CO，CH,次之，含N，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CH,或者CO,和CHa。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%NaCIeqv，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H,S、N，、CH。的 CH-CO,-H,O-NaCI体系。对比全矿床成矿流体、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；白乃庙一谷那乌素；内蒙古
中图分类号：P618.51
文献标志码：A
文章编号：10008527(2011)020243-10
Fluid Inclusions of Quartz-vein Groupin theBainaimiao Area,Inner Mongolia,andIts SignificanceinExploringGoldMineralization
WANG Bi-ren, ZHOU Zhi-guang, YU Yang-sen, NA Fu-chao, XIAO Ru-peng(School of Earth Sciences and Resources, China Unisersity of Geosciences, Bejing100083, Ching)
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 °C , and salinity of 31. 4% -39. 8% NaCl eqv. Homogenization temperature of the two-phase aqueous inclusion is of 210 260 C, and sa-linity of 17. 1% 22. 8% NaCI eqv, and CH,enriched, less COz, H,O , and small amount of H,S, C,Hg, N, at gas phase composition; whereas by temperature of 170 210 °C, CO, or H,O enriched, less CHg, and minor N2, the salinity is as much as that of the former, but with participation of low salinity end-member. The CH, and CO, or only CH, is shown by the pure gas inclusion. In M2 stage, homogenization temperature of two-phase aque-ous inclusions is of 90 160 C , 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 a CH, CO,
收稿日期：2011-01~05；改回日期：2011-03~18；责任编辑：楼亚儿。
基金项目：中国地质调查局地质调查项目"华北地区基础地质调查及数据更新"（121201811001，1212010510506）。作者简介：王必任，男，硕士研究生，1985年出生，构造地质学专业，主要从事区城地质调查工作。
Email: wanghiren888@ q. cor
通信作者：周志广，男，副教投，1967年出生，构造地质学专业，主要从事构造地质学教学和区域地质研究。
Email: zhouzhg@ cugh. edu. cn