| 袁硕浦.内蒙古白乃庙金矿流体包裹体与C-H-O-S稳定同位素特征及其对矿床成因的启示[J].地质与勘探,2022,58(2):286-298 |
| 内蒙古白乃庙金矿流体包裹体与C-H-O-S稳定同位素特征及其对矿床成因的启示 |
| Characteristics of fluid inclusions and C-H-O-S stable isotopes in the Bainaimiao gold deposit, Inner Mongolia and their implications for the deposit genesis |
| 投稿时间：2021-05-08 修订日期：2021-11-20 |
| DOI：10.12134/j.dzykt.2022.02.004 |
| 中文关键词: 流体包裹体 H-C-O-S同位素 矿床成因 白乃庙金矿 内蒙古 |
| 英文关键词: fluid inclusions, H-C-O-S isotopes, ore genesis, Bainaimiao gold deposit, Inner Mongolia |
| 基金项目:内蒙古自治区地质勘查基金”内蒙古自治区中部满都拉-白乃庙一带铜金多金属矿成矿规律与找矿预测”（编号：2018-01-YS01）资助 |
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| 中文摘要: |
| 白乃庙金矿位于中亚造山带南缘白乃庙岛弧区域，是华北地台北缘中段金成矿远景区的重要组成部分。本文通过白乃庙金矿床流体包裹体和C-H-O-S稳定同位素的系统工作，揭示其成矿物质来源、成矿流体性质以及矿床成因。流体包裹体测试数据均一温度（126.5~283.4℃），盐度（0.88%~7.59% NaCl equiv）显示成矿流体具有中低温低盐度的特征。C-H-O同位素特征（δDSMOW为?129‰~?119.5‰，δ18OH2O为?11.06‰~?7.96‰；δ13CPDB为?5.80‰~?3.20‰，δ18OSMOW为?1.06‰~19.91‰）指示成矿热液主要来源于深部岩浆水和大气降水，且以大气降水为主体。δ13CPDB变化范围很小，而δ18OSMOW变化范围较大，这一特征表明成矿流体与围岩有明显的交换反应。S同位素数据（?1.82‰～?4.24‰）指示成矿物质主要来源于深部岩浆体系。综合矿床地质特征、成矿流体特征以及稳定同位素特征，认为白乃庙金矿为浅成低温热液型金矿床。 |
| 英文摘要: |
| The Bainaimiao gold deposit is located in the Bainaimiao island arc in the southern margin of the Central Asian Orogenic Belt, and is an important part of the gold metallogenic prospective area in the middle section of the northern margin of the North China region. This work measured fluid inclusions and C-H-O-S stable isotopes of the Bainaimiao gold deposit in an attempt to reveal the ore-forming material source, the properties of ore-forming fluids and the deposit genesis. The homogeneous temperature (126.5~283.4℃) and salinity (0.88%~7.59% NaCl equiv) of fluid inclusions indicate that the ore-forming fluids are featured by medium-low temperature and low salinity. The isotopic characteristics of C-H-O (-129‰~?119.5‰ for δDSMOW, ?11.06‰~?7.96‰ for δ18OH2O; ?5.80‰~?3.20‰ for δ13CPDB, ?1.06‰~19.91‰ for δ18OSMOW) reveal the ore-forming hydrothermal fluids were derived from deep magma water and atmospheric precipitation, with the latter as dominated. The small variation range of δ13CPDB and large variation range of δ18OSMOW suggest that the ore-forming fluids have undergone exchange reaction with the surrounding rock. The S isotope data (?1.82‰～?4.24‰) indicate that the metallogenic materials were mainly originated from the deep magmatic system. Based on the geological characteristics of the deposit, the characteristics of ore-forming fluids and the characteristics of stable isotopes, the Bainaimiao gold deposit is considered to be an epithermal gold deposit. |
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