中国地质2012，Vol.39Issue(5)：1345-1358,14.
新疆阿吾拉勒山西段穷布拉克铜矿床流体包裹体和碳氧硫同位素研究
Fluid inclusion and stable isotope studies of the Qiongbulake copper deposit in Western Awulale Mountain,Xinjiang
摘要
Abstract
The Qiongbulake copper deposit is the largest deposit in western Awulale Mountain copper belt of Xinjiang. Three ore types from No.l ore body were selected for fluid inclusion and stable isotope studies. The results reveal that all the fluid inclusions are of L—V type and NaCl—H2O system. Fluid inclusions associated with calcite display moderate—low homogenization temperatures (85℃～343cG),moderate — low salinities (1.57～17.79 wt%NaCl eq.) and low densities (0.7g/cm3～1.05 g/cm3). The petrographic characteristics of the fluid inclusions in the three ore types are similar to each other, whereas some differences do exist for the homogenization temperatures and alkalinities. Carbon isotope determinations of calcite show δ13 CPDB values of —3.2‰—6.5‰, suggesting that the carbon was derived from the mantle. Oxygen isotope determinations of the fluids show δ 18OSmow values of 0.45%o～4.44%o. Sulfur isotope determinations of sulfides show δ 34SvDt values of —10.5%o～ 5.5%o. The No. 1 ore body and other volcanic hydrothermal ore bodies have similar fluid inclusion and stable isotope characteristics. Therefore, the No. 1 ore body is not of sedimentation —transformation genesis but of volcanic hydrothermal genesis. The mixing of volcanic hydrothermal solution and circulated meteoric water was probably responsible for ore genesis. The slow cooling of ore—forming fluid played the most important role in the deposition of minerals. However, the effect of dilution and the increase of pH were not negligible.关键词
流体包裹体/稳定同位素/成矿流体/火山热液/穷布拉克Key words
fluid inclusion/ stable isotope/ ore—forming fluid/ volcanic hydrothermal solution/ Qiongbulake分类
天文与地球科学引用本文复制引用
赵军,张作衡,张贺,刘敏,朱维娜..新疆阿吾拉勒山西段穷布拉克铜矿床流体包裹体和碳氧硫同位素研究[J].中国地质,2012,39(5):1345-1358,14.基金项目
国家重点基础研究发展计划(2012CB416803)、国家科技支撑计划(2011BAB06B02)和中国地质调查局地质矿产调查评价项目(1212011085060)联合资助. （2012CB416803）
