柴北缘丁叉叉山地区金红石矿床地质特征及矿床成因  

Geological characteristics and genesis of rutile deposits in Dingchacha Mountain area on the northern margin of Qaidam Basin

作　　者：罗长海 云启成 马德庆 莫延强 谈艳 Luo Changhai;Yun Qicheng;Ma Deqing;Mo Yanqiang;Tan Yan(Qinghai Geological Survey)

机构地区：[1]青海省地质调查局

出　　处：《黄金》2018年第4期22-26,共5页Gold

基　　金：青海省地质勘查基金项目(2017042001ky001)

摘　　要：丁叉叉山地区金红石矿床位于柴北缘超高压变质带东段都兰北带野马滩地区,该地区地质环境复杂,成矿条件优越。目前该地区圈出金红石型钛矿体24条,赋存于金水口岩群榴辉岩中,呈条带状、透镜状产出,近东西向展布,矿床规模已达大型。对研究区地质特征及矿床地质特征的分析表明,丁叉叉山地区榴辉岩型金红石矿床是在高温、超高压环境下变质作用形成的,成矿作用发生在柴达木板块碰撞祁连板块的俯冲过程中,成矿时期为加里东期,成矿温度介于631℃~687℃,成矿物质来源为具有大洋玄武岩特征的富钛铁镁质岩,属超高压变质(变成)成因的典型榴辉岩型金红石矿床。The rutile deposits in Dingchacha Mountain area are located in the Yematan area of northern Dulan belt at the eastern section of northern Qaidam ultra high pressure(UHP)metamorphic belt.The geological settings in the area are complicated and ore-forming conditions are favorable.For now,there are 24 rutile titanium ore bodies delineated in the area,hosted in eclogite of Jinshuikou rock group,occurring in stripes and lens and distributed in EW.The deposit is qualified as a large-scale one.The regional geological characteristics and deposit geological characteristics analysis shows that the eclogite type rutile deposit formed from metamorphism under the environment of high temperature and ultra high pressure.Mineralization occurred when the Qaidam plate and Qilian plate collided and the former subducted.The ore-forming period is Caledonian.Mineralization temperature is between 631℃and 687℃.The source of ore-forming materials is titanium,iron and magnesium rich rocks that have the characteristics of oceanic basalts.The deposit is a typical eclogite rutile deposit from UHP metamorphism.

关 键 词：地质特征 矿床成因 钛矿物 榴辉岩 金红石矿床 丁叉叉山地区 柴北缘 

分 类 号：TD15[矿业工程—矿山地质测量] P624.6[天文地球—地质矿产勘探]