矽卡岩岩浆对中国北方某些矽卡岩型矿床形成的制约: 来自包裹体激光拉曼分析证据

This paper will report Raman analytical results of twenty-three inclusions in garnets, pyroxenes and dolomite or calcite from 9 deposits including Han-Xing iron deposits, Mengku iron deposit and Yangjiazhangzi molybdenum deposit in North China. The purpose of this study is to confirm whether these mineralized skarn minerals contain melt inclusions and fluid-melt inclusions and to obtain the information about their phase state characteristics and phase compositions as well as their distribution situations (local, accidental) and scales (widespread or common). Laser Raman analysis results showed that the all studied skarns contain melt inclusions and/or fluid-melt inclusions, they are direct evidence of magmatic skarns. Combined geological background, thermometry researches for inclusions in minerals of magma-genetic skarns from other areas of China and Laser Raman analysis results of present paper, the origin and formation mechanism of investigated skarns and magma control of magma-genetic skarns to the formation of some skarn type deposits from North China were discussed. Believes that melt inclusions and fluid-melt inclusions-bearing mineralized skarns must be magmatic origin. Their distribution ranges and scale are widespread and very large. Distribution of some skarn deposits from North China in time and space as well as scale is controlled by magmatic skarns distributed in given regions. We hope this study will help to broaden ideas in the study of metallogenic regularity and deep prospecting and exploration for ore deposits of skarn type.