硫同位素在地球化学异常成因研究中的应用  

The Application of Sulfur Isotope in the Cause of Geochemical Abnormality

作　　者：席明杰[1] 马生明[1] 朱立新[2] 弓秋丽[1] 

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,河北廊坊 065000 [2]中国地质科学院,北京 100087

出　　处：《地质学报》2009年第5期705-718,共14页Acta Geologica Sinica

基　　金：国家科技支撑计划项目子专题“内蒙古大兴安岭中北段化探异常评价方法研究”;中国地质科学院基本科研业务费项目(编号Ywf060724);物化探所基本科研业务费(编号AS2007J02)资助的成果。

摘　　要：地球化学异常成因研究是评价其成矿前景、矿化类型的基础。本文借鉴稳定同位素示踪成矿物质来源的原理和方法,将硫同位素引入到地球化学异常成因研究中,通过对乌奴格吐山和垦山试验区Cu矿化体、Cu异常地段硫同位素组成特征的研究,发现在乌奴格吐山试验区Cu矿化及Cu异常地段硫的来源是一致的,表明应用硫同位素组成特征判断地球化学异常成因是可行的;对比发现,垦山试验区Cu异常地段硫同位素值较乌奴格吐山试验区偏高,推断该Cu异常是由后期热液作用形成的,由此认为该异常的地质找矿及工作部署应该围绕热液矿床进行。Geochemical abnormality is the basic means for evaluating mineralization prospect and type. Based on the method and principle of the tracing the source of mineralization material, this study applies sulfur isotope into geochemical abnormity. The research on sulfur isotopic compositions of Cu--mineralized bodies in the Wunugetushan and Kenshan trial areas suggest the same origin of sulfur for both areas, indicating that sulfur isotope can be employed to judge the origin of geochemical abnormity. Comparison study shows that the sulfur isotope compositions in the Kengshan are higher than those in the Wunugetushan, and this implies the Cu abnormity maybe result from hydrothermal effect at the late stage. Our study suggests that geological exploration and arrangement in this area should focus on hydrothermal deposits.

关 键 词：δ34S 硫同位素 地球化学异常 乌奴格吐山铜钼矿床 垦山试验区 

分 类 号：P597[天文地球—地球化学]