Phase separation of ore forming fluid related to gold mineralization in Wynad Gold Field, Southern Granulite Terrain, India: Evidences from fluid inclusion studies

作者：Sahoo Ajit Kumar; Krishnamurthi R; Varghese Saju

来源：Geology of Ore Deposits, 2015, 57(6): 522-535.

DOI：10.1134/S107570151506001X

Fluid inclusion studies were carried out on auriferous quartz veins of Wynad Gold Field, Southern Granulite Terrain of India. Three types of primary fluid inclusions have been observed; Type-I: H2O-CO2 inclusions, Type-II: CO2 inclusions and Type-III: aqueous inclusions. The Type-I and Type-II inclusions are more abundant than Type-III inclusions. The coexistence of Type-I and Type-II inclusions are common within quartz grains in most of the samples studied. Variation in phase ratio and broad range of total homogenization temperature of Type-I and Type-III inclusions (i.e. 194A degrees C to 300A degrees C and 189A degrees C to 282A degrees C, respectively) indicate the entrapment of heterogeneous fluid in inclusions. This heterogeneity could be due to phase separation of original low saline H2O-CO2 ore fluid in response to drop in pressure and temperature. Gold along with other constituents could have precipitated in response to phase separation of the ore fluid.

• 出版日期2015-11