地质与资源2012，Vol.21Issue(6)：546-551,6.
陕西青山金矿床金的迁移形式与沉淀机制研究
TRANSPORTING STYLE AND DEPOSITIONAL MECHANISM OF GOLD IN THE QINGSHAN GOLD DEPOSIT, SHAANXI PROVINCE
摘要
Abstract
The small-medium sized Qingshan gold deposit in Shaanxi Province, hosted in the Carboniferous sedimentary rocks, is of micro-fine dissemination type. The fluid inclusion is examined by atomic absorption spectrometry and gas chromatograph. Based on geochemical thermodynamics theory, the physical-chemical conditions of mineralization and the transportation style and deposition mechanism of the deposit are studied. The result shows that the metallogenic fluid is in weakly acid and reduced, belonging to calcium bicarbonate type, generally regarded as CO2-H2O-NaCl system, mainly derived from ancient meteoric water, and mixed with the meteoric water during later period. The gold in the metallogenic fluid transported as Au-Cl complex [Au(HS)2]- in early mineralization stage, while as Au-S complex [Au(HS)2]- in main and late stages. Change of physical-chemical conditions, such as temperature, salinity, pH, Eh and oxygen fugacity, as well as the mixing of meteoric water, water-rock reaction and sulfate reducing bacteria are the main factors causing the precipitation of gold.关键词
成矿流体/金络合物/迁移和沉淀/青山金矿床/陕西省Key words
ore-forming fluid/ gold complex/ transportation and precipitation/ Qingshan gold deposit/ Shaanxi Province分类
天文与地球科学引用本文复制引用
周云,段其发,陈兵,黄惠兰,李芳..陕西青山金矿床金的迁移形式与沉淀机制研究[J].地质与资源,2012,21(6):546-551,6.基金项目
国家973项目(2011CB403103)和中国地质调查局"扬子型铅锌矿成矿规律研究与选区评价"项目(1212011120790)联合资助. （2011CB403103）
