Characteristics of melt inclusions in skarn minerals from Fe, Cu(Au) and Au(Cu) ore deposits in the region from Daye to Jiujiang  

作　　者：赵斌 赵劲松 李兆麟 张重泽 彭卓伦 

机构地区：[1]GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences [2]DepartmentofGeology,ZhongshanUniversity

出　　处：《Science China Earth Sciences》2003年第5期481-497,共17页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 49772115).

摘　　要：A vast amount of the melt inclusions and fluid-melt inclusions have been found in skarn minerals from Fe, Cu(Au) and Au(Cu) ore deposits distributed from Daye to Jiujiang along the Yangtze River besides vapor-liquid inclusions. The melt inclusions are many and varied in shape. They mainly consist of crystallized silicate phases (Csi), iron phases (Fe), amorphous silicate phases (Asi) and vapor (V) with different volume percentages, and some of them contain several crystallized silicate phases. These melt inclusion sizes are commonly (10—46) × (6—15) μm2. A difference between the fluid-melt inclusions and melt inclusions is that the liquid phase appears in the former and their homogenization temperatures are lower than the latter. We measured the homogenization temperatures of the melt inclusions, fluid-melt inclusions and fluid inclusions in ten thin sections from eight ore deposits on Leitz microscope heating stage 1350 which was made in Germany. Forty-eight homogenization temperature values have been obtained. Among them, thirty-nine values are homogenization temperatures of the melt inclusions in garnet and pyroxene from skarns, two values are homogenization temperatures of fluid-melt inclusions, others belong to the fluid inclusions. Melt inclusions in garnet and pyroxene have homogenization temperatures of 890—1115°C. Fluid-melt inclusions have homogenization temperatures of 745—750°C. Homogenization temperatures of fluid inclusions are between 580°C and 675°C. The average of thirtynine homogenization temperatures for the melt inclusions is 1029.9°C. We think studied skarns to be magmatic genesis on the basis of available data relative to the characteristic features of phase states within the melt inclusions and the fluid melt inclusions and their homogenization temperatures.A vast amount of the melt inclusions and fluid-melt inclusions have been found in skarn minerals from Fe, Cu(Au) and Au(Cu) ore deposits distributed from Daye to Jiujiang along the Yangtze River besides vapor-liquid inclusions. The melt inclusions are many and varied in shape. They mainly consist of crystallized silicate phases (CSi), iron phases (Fe), amorphous sili-cate phases (ASi) and vapor (V) with different volume percentages, and some of them contain sev-eral crystallized silicate phases. These melt inclusion sizes are commonly (10—46)×(6—15) mm2. A difference between the fluid-melt inclusions and melt inclusions is that the liquid phase appears in the former and their homogenization temperatures are lower than the latter. We measured the homogenization temperatures of the melt inclusions, fluid-melt inclusions and fluid inclusions in ten thin sections from eight ore deposits on Leitz microscope heating stage 1350 which was made in Germany. Forty-eight homogenization temperature values have been obtained. Among them, thirty-nine values are homogenization temperatures of the melt inclusions in garnet and pyroxene from skarns, two values are homogenization temperatures of fluid-melt inclusions, others belong to the fluid inclusions. Melt inclusions in garnet and pyroxene have homogenization temperatures of 890—1115℃. Fluid-melt inclusions have homogenization temperatures of 745—750℃. Homog-enization temperatures of fluid inclusions are between 580℃ and 675℃. The average of thirty- nine homogenization temperatures for the melt inclusions is 1029.9℃. We think studied skarns to be magmatic genesis on the basis of available data relative to the characteristic features of phase states within the melt inclusions and the fluid melt inclusions and their homogenization tempera-tures.

关 键 词：skarn  MELT inclusion  MAGMATIC origin. 

分 类 号：P595[天文地球—地球化学]