摘要
对西秦岭中川地区李坝、金山和马泉等大中型金矿床主要成矿阶段石英中流体包裹体的系统研究表明 ,这些金矿床原生流体包裹体主要有CO2 _H2 O、富CO2 和水溶液包裹体 3种类型 ,成矿流体以CO2 _NaCl_H2 O型为主 ,富CO2 、低盐度、高温和不混溶为其主要特点。结合区内已有同位素资料、区域地质背景和成岩成矿特点 ,推断流体成矿作用与区内大量中生代同熔或重熔岩浆作用及其上侵定位有密切关系 ,成矿流体主要来源于岩浆 ,混入有不同程度的变质水和大气降水 ,并且有深部来源物质参与成矿。
Detailed studies were carried out on the fluid inclusions in quartz from Liba, Jinshan and Maquan gold deposits in Zhongchuan area, western Qinling orogenic belt. Three types of inclusions can be recognized in these deposits, i.e., CO-2-H-2O, CO-2-rich and aqueous inclusions. The ore-forming fluids are mainly of CO-2-NaCl-H-2O type characterized by rich CO-2, low salinity, high temperature and immiscibility. In combination with the previous isotopic data, the regional geological setting and the features of diagenesis and metallogeny, it may be concluded that the ore-forming fluids were closely related to the Mesozoic syntexis or re-melted granitic magmas and their intrusions. The ore-forming fluids were derived from the deep magma and mixed with meteoric and metamorphic water. Some materials derived from the deep area might have been involved in the ore-forming system.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2004年第2期147-157,共11页
Acta Petrologica et Mineralogica
基金
国家重点基础研究规划发展资助项目 (G19990 43 2 11)
关键词
流体包裹体
地质意义
金矿床
中川地区
西秦岭
fluid inclusion
geological significance
gold deposit
Zhongchuan area
western Qinling
