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

本文将报道中国北方主要矽卡岩型矿床矿物熔融包裹体和流体-熔融包裹体的激光拉曼分析结果。研究目的是确认这些矿化矽卡岩矿物是否含熔融包裹体和流体-熔融包裹体,获取有关它们相态特征和相组成以及它们的分布状况(是局部的、偶然性的,还是广泛的)的信息。文章对邯邢铁矿、蒙库铁矿和杨家杖子钼矿等9个矿床12块标本中石榴石、辉石和方解石或白云石中23个包裹体进行了共聚焦激光拉曼光谱仪分析。拉曼分析结果表明,所研究的矽卡岩矿物均含熔融包裹体和/或流体-熔融包裹体,它们是岩浆矽卡岩的直接证据。结合本文激光拉曼分析结果、地质背景和其他地区岩浆矽卡岩矿物包裹体测温学研究,对所研究矽卡岩的形成机制和岩浆矽卡岩对中国北方某些矽卡岩型矿床的制约进行了讨论。认为含有熔融包裹体和/或流体-熔融包裹体的矿化矽卡岩系岩浆成因,其分布范围广泛,规模不小。中国北方某些矽卡岩型矿床的时空分布和规模受控于该地区分布的岩浆矽卡岩。希望本文有助于拓宽矽卡岩型矿床成矿规律研究和深部找矿勘探的思路。

Magma control of magmatic skarn to the formation of some deposits of skarn type: Evidence from Laser Raman analyses of inclusions in minerals

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.