敦煌地块南缘构造岩浆热事件与成矿研究新进展  

RESEARCH PROGRESS OF THE TECTONIC-MAGMATIC THERMAL EVENTS AND MINERALIZATION IN THE SOUTHERN MARGIN OF DUNHUANG BLOCK,WESTERN CHINA

作　　者：王玉玺[1] 李通国[1] 马国杰[1] 张渊[1] 王怀涛[1] 朱永新[1] 路鹏飞 WANG Yu-xi;LI Tong-guo;MA Guo-jie;ZHANG Yuan;WANG Huai-tao;ZHU Yong-xin;LU Peng-fei(Geological Survey of Gansu Province,Lanzhou 7300001 China)

机构地区：[1]甘肃省地质调查院,甘肃兰州730000

出　　处：《甘肃地质》2019年第3期11-17,共7页Gansu Geology

基　　金：甘肃省省级基础地质调查项目“甘肃省多坝沟地区1∶5万矿产远景调查(20151616)”;中国地质调查局地质调查项目“中国矿产地质与成矿规律综合集成和服务(矿产地质志)(项目编号:DD20190379)”,“甘肃矿产资源国情调查前期准备(KD-[2019]-XZ-126)”;甘肃省地质勘查基金项目“甘肃省阿克塞县多坝沟金多金属矿普查(2017D18)”。

摘　　要："甘肃省多坝沟地区1∶5万矿产远景调查"项目较系统的调查研究了敦煌地块南缘构造岩浆演化,划分出4个主要构造岩浆活动期,包括古元古代Columbia超大陆汇聚碰撞和大规模裂解期,早古生代洋盆俯冲闭合碰撞期,晚古生代古亚洲洋闭合相关造山活动期和碰撞造山晚期向板内伸展环境的快速转变期。新发现了金、铁、稀有金属多处矿点,主要有多坝沟金矿、延龙山钪矿、玉玺山铁矿、玉玺山砂矿型磁铁矿(钛铁矿)、八龙沟铌钽矿、高家山铌钽矿等。明确了敦煌地块南缘与岩浆活动相关的3个主要成矿期,有古元古代晚期稀有金属矿成矿期,早古生代金铜铁多金属成矿期和晚古生代—早中生代稀有金属成矿期。研究表明敦煌地块南缘具有铁、金、稀有金属矿成矿潜力。Tectonic-magmatic evolution in the southern margin of Dunhuang block has been systematically studied,which from the project of"1∶50000 mineral prospecting survey in Duobagou area,Gansu Province".The main magma activities divided into 4 stages,including the Paleoproterozoic Columbia supercontinent gathering collision and large-scale cracking stage,early Paleozoic ocean basin closure,plate subduction and collision stage,late Paleozoic the process of dilation-dive-collision of the micro-oceanic basin in the southern part of the Paleo-Asian Ocean and the stage of rapid transition from the late period of collision to intraplate extension environment.There have been newly discovered many deposits,which include Duobagou gold ore,Yanlongshan scandium ore,Yuxishan iron ore,Yuxishan placer-type magnetite(ilmenite)ore,Balonggou niobium-tantalum ore and Gaojiashan niobium-tantalum ore,etc.The three mainly mineralization stages related to the magmatic activities have been definite in the southern margin of Dunhuang block,which include the rare metal metallogenic period in late Paleoproterozoic,the gold-copper-iron polymetallic metallogenic period in early Paleozoic and the rare metal metallogenic period in late Paleozoic to early Mesozoic.Studies have shown that there were preferable mineralization potential for iron,gold,rare metal in the southern margin of Dunhuang block.

关 键 词：构造岩浆 成矿作用 敦煌地块 古生代 金矿 稀有金属矿 

分 类 号：P542[天文地球—构造地质学] P622[天文地球—地质学]