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周向科,王建国,刘荫椿,李光景,雷恒永,毛冰.哀牢山金矿带冬瓜林金矿床流体包裹体及硫同位素研究[J].岩矿测试,2017,36(4):430-439
ZHOU Xiang-ke,WANG Jian-guo,LIU Yin-chun,LI Guang-jing,LEI Heng-yong,MAO Bing.Fluid Inclusion and Sulfur Isotope Study on the Donggualin Gold Deposit in the Ailaoshan Gold Belt[J].Rock and Mineral Analysis,2017,36(4):430-439.DOI:10.15898/j.cnki.11-2131/td.201701060002
哀牢山金矿带冬瓜林金矿床流体包裹体及硫同位素研究
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Fluid Inclusion and Sulfur Isotope Study on the Donggualin Gold Deposit in the Ailaoshan Gold Belt
投稿时间:2017-01-06  修订日期:2017-06-10
DOI:10.15898/j.cnki.11-2131/td.201701060002
中文关键词: 冬瓜林金矿床  流体包裹体  硫同位素  幔源流体  显微测温法
英文关键词: Donggualin gold deposit  fluid inclusion  sulfur isotope  mantle-derived fluid  microthermometry
基金项目:国土资源部科技专项"地质遗迹标本采集、购置与综合研究"项目(121113000000170404-9)
作者单位E-mail
周向科 中国地质大学(北京) 地球科学与资源学院, 北京 100083
中国地质博物馆, 北京 100034 
 
王建国 中国地质大学(北京) 地球科学与资源学院, 北京 100083 wjg@cugb.edu.cn 
刘荫椿 中国黄金集团公司科技公司, 北京 100176  
李光景 中国黄金集团公司科技公司, 北京 100176  
雷恒永 云南黄金有限责任公司镇沅分公司, 云南 镇沅 666511  
毛冰 中国地质博物馆, 北京 100034  
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中文摘要:
      流体包裹体和硫同位素研究可以揭示成矿流体特征和成矿物质来源,是探讨矿床成因的重要手段。冬瓜林金矿床位于哀牢山金矿带的镇沅金矿田,研究程度较低,矿床成因研究尚未系统开展。本文针对该矿床利用显微测温和硫同位素示踪,分别对两个金成矿阶段脉体中的流体包裹体和矿石中黄铁矿的硫同位素进行了测定,进而探讨其矿床成因。流体包裹体测试结果显示,流体体系为NaCl-H2O体系;包裹体的均一温度主要分布于100~400℃(有160~190℃和280~310℃两个峰值),盐度集中于6%~9%,密度集中于0.7~0.8 g/cm3和0.9~1.0 g/cm3,表明成矿流体为中低温度和低盐度的流体。硫同位素测试结果显示,两个金成矿阶段的δ34S值分别集中于0~1‰和-4.7‰~3‰,整体上与该矿床最主要的矿石——煌斑岩型矿石的δ34S值最为接近,且矿床中煌斑岩和金矿化关系最为密切,因此成矿物质可能主要来自与煌斑岩有关的幔源物质,但受到地壳物质的混染。综合上述结果认为,冬瓜林金矿床的形成可能与幔源含金流体有关,但有大气降水和围岩的加入,这一结论为揭示本矿床及哀牢山金矿带的矿床成因研究提供了重要依据。
英文摘要:
      Fluid inclusions and sulfur isotopes can reveal the characteristics of ore-forming fluid and the origin of ore-forming materials, which are important indicators for ore genesis. The Donggualin gold deposit is located in the Zhenyuan gold orefield of the Ailaoshan gold belt. Only a few studies have been carried out on this deposit and thus the ore genesis remains unsolved. Microthermometry of fluid inclusion in veins from two mineralization stages and sulfur isotope analyses of pyrite from ores has been studied, in order to unravel the ore genesis. Fluid inclusion results show that the ore-forming fluids belong mainly to the NaCl-H2O system and the homogenization temperatures range from 100℃ to 400℃, with two peak values of 160-190℃ and 280-310℃. The salinities peak at 6%-9% NaCleqv. The densities have two peaks of 0.7-0.8 g/cm3 and 0.9-1.0 g/cm3. These results suggest that the gold-forming fluids are characterized by mid-low temperature and low salinity. The δ34S values of pyrite from the two stages are 0-1‰ and -4.7‰-3‰, respectively, which are generally consistent with those of the lamprophyre wallrock (-0.44‰-0.54‰). The lamprophyre is very close to gold mineralization and lamprophyre-hosted ore is the most common. It can be inferred that the ore materials are probably related to the lamprophyre derived from mantle related to minor crustal contamination. In conclusion, the Donggualin deposit was possibly formed by mantle-derived gold-bearing fluids involved in meteoric water and wall rocks. This research provides an important clue for the ore genesis of the Donggualin gold deposit and gold deposits in the Ailaoshan gold belt.
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