黑龙江省多宝山地区中奥陶世侵入岩锆石U-Pb年龄及构造环境  

ZIRCON U-Pb AGE AND TECTONIC SETTING OF THE MIDDLE ORDOVICIAN INTRUSIVE ROCKS IN DUOBAOSHAN AREA,HEILONGJIANG PROVINCE

作　　者：于喜洹 石国明 符安宗 李新鹏 孙江军 尹国良 林泽付 YU Xi-huan;SHI Guoming;FU An-zong;LI Xin-peng;SUN Jiang-jun;YIN Guo-liang;LIN Ze-fu(Natural Resources Survey Institute of Heilongjiang Province,Harbin 150036,China)

机构地区：[1]黑龙江省自然资源调查院,黑龙江哈尔滨150036

出　　处：《地质与资源》2022年第5期588-596,共9页Geology and Resources

基　　金：中国地质调查局“大兴安岭成矿带漠河-扎兰屯地区地质矿产调查”项目(DD20160047-07).

摘　　要：多宝山地区位于兴蒙造山带东段扎兰屯-多宝山岛弧构造带,早古生代地质体发育,且与区域成矿作用关系密切. 通过对多宝山地区中奥陶世侵入岩的岩相学、岩石地球化学、同位素年代学特征的研究,对其形成时代、构造环境及成矿作用进行了探讨. 定年结果显示花岗闪长岩LA-MC-ICP-MS 锆石U-Pb年龄为488±3 Ma,形成时代为中奥陶世;岩浆物质来源以幔源为主,同熔了部分壳源物质,伴随强烈的构造热事件和岩浆侵入喷发活动,大量深源流体带来Au、Cu等成矿元素,在有利成矿条件和扩容空间下,形成多宝山铜(钼)矿床. 研究显示,中奥陶世花岗闪长岩形成于与板块俯冲有关的岛弧环境.The Duobaoshan area is located in Zhalantun-Duobaoshan island arc tectonic belt in the eastern section of Xing’an-Mongolian orogenic belt,with the Early Paleozoic geological bodies developed and closely related to regional mineralization.The formation age,tectonic setting and mineralization are discussed based on the study of petrography,lithogeochemistry and isotopic chronology of the Middle Ordovician intrusive rocks in Duobaoshan area.The LA-MC-ICP-MS zircon U-Pb age of granodiorites is 488±3 Ma,indicating that the granodiorites were formed in the Middle Ordovician.The magma source is mainly mantle origin with some crust-derived materials.With intensive tectonic thermal events and magmatic intrusion-eruption activities,a large number of deep fluids bring metallogenic elements such as Au and Cu to form Duobaoshan Cu-Mo deposit under favorable minerogenetic conditions and expanded space.

关 键 词：花岗闪长岩 锆石U-PB年龄 构造环境 中奥陶世 铜(钼)矿床 黑龙江省 

分 类 号：P597.1[天文地球—地球化学]