摘要
在简述西秦岭地区成矿环境的基础上 ,对该区金矿床的包裹体及氢氧同位素特征进行了研究 ,结果表明 :本区金矿床多赋存于泥盆系浅变质碎屑岩及不纯碳酸盐岩中 ,成矿具多期多阶段的特点 .成矿流体多为富 CO2 的 Na+- Ca2 + - Cl- - SO2 - 4 型低盐度热卤水 ,矿液来源较为复杂 ,以大气降水为主 ,并不同程度地受岩浆作用及赋矿围岩的影响 .成矿是在中低温、弱还原、弱酸性的条件下进行的 .
On the basis of introducing metallogenic setting of the western Qinling area,the features of inclusion and H and O isotopes of the gold deposits in this area are studied.The results show that the gold deposits in this area, occurred mainly in epimetamorphosed clastic rocks and impure carbonate of Devonian,are characterized by multi stage mineralization.Metallogenic fluids mostly belong to Na +-Ca 2+ -Cl --SO 2- 4 type thermal bittern with rich CO 2 and low salinity.They mainly originated from atmosphere precipitation and were influenced by magamatism and wall rocks of ore deposits.Mineralization was carried out under condition of middle low temperature,weak reduction,and weak acid.
基金
国家西部科技攻关项目!96- 91 4 - 0 1 - 0 4专题
有色地勘总局重点项目!98- D- 1资助
关键词
金矿床
包裹体
氧同位素
氢同位素
地质意义
gold deposit
inclusion
hydrogen and oxygen isotopes
western Qinling
