江苏省东海县青龙山矿区榴辉岩型石榴子石矿成矿特征  

Metallogenic Characteristics of Eclogite Type Garnet Ore in Qinglongshan Mining Area,Donghai County,Jiangsu Province

作　　者：刘跃青 赵盛博 LIU Yue-qing;ZHAO Sheng-bo(The Sixth Geological Team of Jiangsu Geology and Mining Bureau,Lianyungang,Jiangsu 222023)

机构地区：[1]江苏省地质矿产局第六地质大队,江苏连云港222023

出　　处：《四川地质学报》2022年第3期393-396,共4页Acta Geologica Sichuan

基　　金：江苏省东海县青龙山矿区石榴子石矿普查项目(苏地矿发[2011]65号)。

摘　　要：榴辉岩型石榴子石矿与高级区域变质岩-榴辉岩密切相关,本区榴辉岩的形成经历了四个变质阶段:绿帘角闪岩相进变质阶段、柯石英榴辉岩相峰期进变质阶段、石英榴辉岩岩相阶段、角闪岩相退变质阶段。榴辉岩体呈长条状、透镜状产出,接触面产状以及岩体延伸方向均与围岩片麻岩一致。本区榴辉岩根据结构构造不同可分为两种类型:块状榴辉岩和面理化榴辉岩,矿石中石榴子石含量15%~70%,平均35.69%,其赋存状态主要呈它形粒状集合体,与绿辉石镶嵌在一起。本区榴辉岩矿石中富含金红石、绿辉石等,综合利用价值高,有较好的开发利用前景。Eclogite type garnet ore are closely related to the high grade regional metamorphic rocks and eclogite.The eclogite in this area underwent four metamorphic stages:the epidote-amphibolite facies prograde metamorphic stage,the coesite-eclogite faciesprograde metamorphism stage,the quartz eclogite facies stage,and the hornblende facies retrograde metamorphic stage.The eclogite bodies are elongated and lenticular in shape,the contact surface occurrence and the extensional direction of the bodies are consistent with the surrounding gneisses.The eclogite in this area can be divided into two types:massive eclogites and faceted eclogites,with garnet content in the ore ranging from 15% to 70%,averaging 35.69%.Its occurrence state is mainly anhedral granular aggregate,inlaid with omphacite.The eclogite ores in this area are rich in rutile,omphacite,etc.,with high comprehensive utilization value and good prospects for development and utilization.

关 键 词：石榴子石 榴辉岩 成矿特征 东海县 超高压变质带 

分 类 号：P619.24[天文地球—矿床学]