投稿时间：2013-04-23
修订日期：2013-12-24
网络发布日期：2014-04-26
中文摘要:新疆索尔巴斯陶金矿床位于博格达晚古生代弧后盆地与哈尔里克古生代复合岛弧的结合部位，矿体呈脉状产于下石炭统塔克尔巴斯陶组内。流体包裹体研究表明，该矿区石英内的流体包裹体以发育NaCl-H2O型气液两相包裹体为特征。测温结果显示，流体包裹体完全均一温度范围为129~236℃，平均163℃；流体盐度w（NaCleq）为0.35%~9.86%，平均值为3.01%；计算得到的流体密度为0.86~0.98 g/cm3，平均为0.93 g/cm3。这些都表明索尔巴斯陶金矿床的成矿流体具有低温度、低盐度、低密度的特征。对成矿压力和深度的估算表明，其成矿压力为3.6~32.5 MPa，成矿深度小于1200 m，显示其具有浅成热液矿床的特征。同时，其氢、氧同位素测试表明成矿流体以大气降水为主，硫同位素测试表明其成矿物质主要来自赋矿围岩火山岩。结合矿床地质特征，索尔巴斯陶金矿床应属低硫型浅成低温热液型金矿床。
Abstract:The Suoerbasitao gold deposit is located in the juncture between Bogda late Paleozoic back-arc basin and Harlik Paleozoic composite island arc in Xinjiang, and its orebodies lie in the Lower Carboniferous Takebasitao (C1tk) Formation as veins. The study of fluid inclusions indicates that the fluid inclusions in quartz veins exhibit the characteristics of NaCl-H2O gas-liquid two-phase inclusions in this deposit. In addition, the temperature testing results show that the homogenization temperature varies from 129 to 236℃, with an average of 163℃, that the fluid salinity w(NaCleq) value ranges between 0.35% and 9.86%, with an average of 3.01%, and that the fluid density ranges from 0.86 to 0.98 g/cm3, with an average of 0.93 g/cm3. Consequently, all the evidence above suggests that the ore-forming fluid of the Suoerbasitao gold deposit has the characteristics of low temperature, low salinity, and low density. On the other hand, an estimation of the mineralization pressure which ranges from 3.6 to 32.5 MPa, together with an evaluation of the capture depth of less than 1200 m, demonstrates that the deposit has some characteristics of epithermal deposit, and the hydrogen and oxygen isotopes data indicate that the ore-forming fluids consist mostly of meteoric water. Besides, sulfur isotope evidence implies that the ore-forming materials mainly came from the surrounding ore-bearing volcanic rocks. Therefore, on the basis of all these data and the geological characteristics of the deposit, the Suoerbasitao gold deposit should belong to low-sulfidation epithermal gold deposit.
keywords:geology geochemistry fluid inclusions deposit genesis epithermal Suoerbasitao Balikun Xinjiang
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中图分类号：P618.51
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基金项目:本文得到“十二五”科技支撑计划重点项目“博格达-哈尔里克成矿带铜-金成矿条件研究及靶区评价”（编号：2011BAB06B04-2）和新疆中亚造山带大陆动力学与成矿预测实验室开放课题（编号：XJDX1102-2011-04）的共同资助
引用文本：
李平,朱志新,陈川,赵同阳,徐仕琪,刘鑫,陈邦学,靳刘圆.2014.新疆巴里坤索尔巴斯陶金矿床成矿流体特征及矿床成因[J].矿床地质,33(2):339~349LI Ping,ZHU ZhiXin,CHEN Chuan,ZHAO TongYang,XU ShiQi,LIU Xin,CHEN BangXue,JIN LiuYuan.2014.Ore-forming fluids and genesis of Suoerbasitao gold deposit in Balikun, Xinjiang[J].Mineral Deposits33(2):339~349
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