青海谢坑铜金矿床石榴石矽卡岩成因研究  

Genesis of Garnet Skarn of the Xiekeng Cu-Au Deposit in Qinghai Province

作　　者：王星 肖荣阁[2] 杨立朋[2] 王斌[2] 

机构地区：[1]青海省有色地质七队,青海平安810600 [2]中国地质大学地球科学与资源学院,北京100083

出　　处：《现代地质》2008年第5期733-742,共10页Geoscience

基　　金：河南省国土资源厅科研项目(2008-4);中国地质大学(北京)地质过程与矿产资源国家重点实验室科学基金项目(GPMR200646)

摘　　要：传统矿床学研究认为,只能是中酸性岩浆接触交代碳酸盐岩形成矽卡岩,但是近年来在一系列矽卡岩矿床的研究中发现,矽卡岩原岩并非纯的碳酸盐岩,一些矽卡岩原岩成分接近矽卡岩的成分,因此传统的矽卡岩型矿床成因也值得重新认识。青海省循化县谢坑铜金矿床是20世纪90年代以来发现的石榴石矽卡岩和石榴石透辉石型矽卡岩矿床。通过系统研究该矿床矽卡岩的地球化学特征,发现矿化矽卡岩岩石化学特征及稀土元素、微量元素地球化学特征与泥灰岩和辉石闪长岩类岩浆岩的极其一致,因此该矽卡岩并非传统意义上的矽卡岩,而是热液作用下的岩浆岩及泥灰岩的自变质成因矽卡岩。According to the traditional mineral deposit geological data, skarn is only formed from intermediateacid magma contacting and replacing carbonate, but skarn original rocks are not pure carbonates and their compositions of some skarn original rocks are close to those of skarn in recent studies, so the traditional genesis of skarn deposit would be further investigated. Xiekeng Cn-Au deposit, Xnnhna County, Qinghai Province, which was found in 1990＇s, is a garnet-skarn-type and garnet-diopside-skarn-type deposit. Petrochemical characteristics and geochemical characteristics of rare earth elements and trace elements of the mineralized skarn are rather similar to those of the marlitic-sedimentary and pyroxene-diorite-type magmatic rocks, therefore, this kind of skarn is not the traditional skarn but the skarn which is formed by auto-metamorphism of magmatic rock and marlitic-sedimentary in the hydrothermal process by systematically studying on the geochemical characteristics of the skarn.

关 键 词：矽卡岩成因 岩石地球化学 自变质成因 谢坑铜金矿 青海 

分 类 号：P618.7[天文地球—矿床学]