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    南蒙古古生代岛弧地体中酸性岩石锆石年代学、Hf同位素特征及地质意义

    张伟波 王丰翔 刘翼飞 江思宏 何学洲 于瑞 李谦谦

    张伟波, 王丰翔, 刘翼飞, 江思宏, 何学洲, 于瑞, 李谦谦, 2022. 南蒙古古生代岛弧地体中酸性岩石锆石年代学、Hf同位素特征及地质意义. 地球科学, 47(8): 2824-2838. doi: 10.3799/dqkx.2021.197
    引用本文: 张伟波, 王丰翔, 刘翼飞, 江思宏, 何学洲, 于瑞, 李谦谦, 2022. 南蒙古古生代岛弧地体中酸性岩石锆石年代学、Hf同位素特征及地质意义. 地球科学, 47(8): 2824-2838. doi: 10.3799/dqkx.2021.197
    Zhang Weibo, Wang Fengxiang, Liu Yifei, Jiang Sihong, He Xuezhou, Yu Rui, Li Qianqian, 2022. Zircon Geochronology and Hf Isotope of Intermediate Acidity Magmatic Rocks in the Island Arc Terrane of South Mongolia and Their Geological Significance. Earth Science, 47(8): 2824-2838. doi: 10.3799/dqkx.2021.197
    Citation: Zhang Weibo, Wang Fengxiang, Liu Yifei, Jiang Sihong, He Xuezhou, Yu Rui, Li Qianqian, 2022. Zircon Geochronology and Hf Isotope of Intermediate Acidity Magmatic Rocks in the Island Arc Terrane of South Mongolia and Their Geological Significance. Earth Science, 47(8): 2824-2838. doi: 10.3799/dqkx.2021.197

    南蒙古古生代岛弧地体中酸性岩石锆石年代学、Hf同位素特征及地质意义

    doi: 10.3799/dqkx.2021.197
    基金项目: 

    中国地质调查局项目 DD20211404

    中国地质调查局项目 DD20190437

    中国地质调查局项目 DD20190455

    详细信息
      作者简介:

      张伟波(1987-), 男, 博士研究生, 从事境外矿产资源研究.ORCID: 0000-0001-6246-2487.E-mail: zhangwb2007@163.com

      通讯作者:

      江思宏, ORCID: 0000-0002-7969-3860.E-mail: jiangsihong1@163.com

    • 中图分类号: P597

    Zircon Geochronology and Hf Isotope of Intermediate Acidity Magmatic Rocks in the Island Arc Terrane of South Mongolia and Their Geological Significance

    • 摘要: 南蒙古曼达洛沃-古尔班赛汗岛弧地体是中亚造山带的重要组成部分,为了探讨岛弧地体内岩浆活动及地壳演化过程与斑岩型铜多金属矿床成矿作用的成因关系,对产出在该地体内代表性斑岩铜矿床与成矿作用有关的岩石进行了岩相学、锆石年代学及Hf同位素组成分析. 哈马戈泰铜-金矿床出露的与成矿有关的岩石为花岗闪长岩-二长闪长玢岩组合,LA⁃MC⁃ICP⁃MS锆石定年数据显示,成岩年龄为332~324 Ma;查干苏布尔加矿区产出有二长花岗斑岩,为铜-钼矿化的容矿岩体,本次测定的成岩年龄为~372 Ma;青狐狸斑岩型铜多金属矿化与闪长岩具有成因联系,本次测定的成岩年龄为~333 Ma;奥尤特乌兰铜多金属矿区岩浆岩活动强烈,产出有二长岩和安山岩-花岗闪长岩杂岩体,本次测定的成岩年龄分别为~381 Ma和338~332 Ma. 综上所述,曼达洛沃-古尔班赛汗岛弧地体晚古生代岩浆活动主要分为3个阶段:383~369 Ma、367~363 Ma和338~321 Ma. 其中,与斑岩铜多金属矿化有成因联系的岩浆活动主要集中在375~369 Ma和338~328 Ma两个时期,可能为该区域两个最重要的成矿期. 原位锆石εHft)位于球粒陨石演化线之上,介于+7.85~+16.14之间,部分分析点与亏损地幔值相似,显示成岩物质来源可能是亏损地幔部分熔融形成的新生物质在地壳短暂停留后再次部分熔融的产物,同时也受到了一定程度成熟地壳的混染. Hf同位素两阶段模式年龄tDM2为331~717 Ma,表明本区发生重要的地壳增生事件的时间是新元古代至晚古生代.

       

    • 图  1  研究区大地构造位置(a)以及蒙古国主要构造单元(b)

      Fig.  1.  The figure showing the geotectonic location of the study area (a) and Main terranes of Mongolia(b)

      图  2  研究区地质简图及主要斑岩型铜矿床分布

      Fig.  2.  Simplified geological map of study area in South Mongolia, showing major porphyry deposits

      图  3  南蒙古岛弧地体中酸性岩石样品照片和岩相学照片

      Fig.  3.  Specimen photos and photomicrographs of intermediate acidity magmatic rocks in the island arc terrane of South Mongolia

      图  4  南蒙古岛弧地体中酸性岩石样品锆石U⁃Pb谐和图

      Fig.  4.  U⁃Pb concordia diagrams of zircon for intermediate acidity magmatic rocks in the island arc terrane of South Mongolia

      图  5  南蒙古岛弧地体中酸性岩石样品锆石εHf(t)⁃t图解

      Fig.  5.  εHf(t) vs. zircon age plot for intermediate acidity magmatic rocks in the island arc terrane of South Mongolia

      图  6  南蒙古岛弧地体古生代主要岩浆活动

      Fig.  6.  Age of Paleozoic magmatic event in the island arc terrane of South Mongolia

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