现代地质2012，Vol.26Issue(2)：277-285,9.
贵州丫他卡林型金矿床流体包裹体特征及其成矿意义
Fluid Inclusion Characteristics of Yata Carlin-type Gold Deposit,Guizhou Province and Its Metallogenic Significance
摘要
Abstract
Yata gold deposit is a typical sediment-hosted disseminated gold deposit in southwestern Guizhou. Based on the data from fluid inclusions, we discuss the temperature and pressure conditions and the fluid evolution in the ore-forming process. Results from petrographic observation and fluid inclusion microthermometry study of gangue minerals in different stages give us the following conclusions: fluid inclusions in the main mineralizing stage can be divided into three categories including H2O, CO2 and CO2-H2O inclusions, which indicates the immiscibility of the ore-forming fluid; while fluid inclusions in the late mineralizing stage are mainly H2O inclusions; homogenization temperatures of H2O inclusions in the main mine-ralizing stage vary from 139 to 268 °C, salinities range from 2. 9% to 7. 4% , while homogenization temperatures of H2O inclusions in the late mineralizing stage vary from 121 to 194 X., and salinities range from 2. 7% to 6. 6%. According to the simultaneous solution of isochoric formulas derived from H2O inclusions and CO2 inclusions, the capture temperatures of inclusions in the main mineralizing stage vary from 260 to 294 °C, while capture pressures range from 59 to 98 Mpa. Based on the comparison of characteristics of CO2 -rich fluids in different types of gold deposits, we conclude that CO2-rich fluid in Carlin-type gold deposits in southwestern Guizhou may play a role in the transportation of gold, and that phase separation between C02 and H2O could be the cause for gold deposition.关键词
流体包裹体/成矿流体/丫他金矿床/卡林型/贵州Key words
fluid inclusion/ ore-forming fluid/ Yata gold deposit/ Carlin-type/ Guizhou分类
天文与地球科学引用本文复制引用
吴程赟,顾雪祥,刘丽,李保华,程文斌,章永梅,彭义伟..贵州丫他卡林型金矿床流体包裹体特征及其成矿意义[J].现代地质,2012,26(2):277-285,9.基金项目
国家自然科学基金重点项目(40930423). （40930423）
