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    蒙古国东部矽卡岩型铁多金属矿床成矿岩体年代学及地球化学

    张莉莉 江思宏 王怀坤 孟祥熙 张帅 武昱东

    张莉莉, 江思宏, 王怀坤, 孟祥熙, 张帅, 武昱东, 2022. 蒙古国东部矽卡岩型铁多金属矿床成矿岩体年代学及地球化学. 地球科学, 47(8): 2856-2870. doi: 10.3799/dqkx.2021.136
    引用本文: 张莉莉, 江思宏, 王怀坤, 孟祥熙, 张帅, 武昱东, 2022. 蒙古国东部矽卡岩型铁多金属矿床成矿岩体年代学及地球化学. 地球科学, 47(8): 2856-2870. doi: 10.3799/dqkx.2021.136
    Zhang Lili, Jiang Sihong, Wang Huaikun, Meng Xiangxi, Zhang Shuai, Wu Yudong, 2022. Geochronology and Geochemical Features of the Ore-Related Granite in the Skarn Type Fe Polymetallic Deposits in Eastern Mongolia. Earth Science, 47(8): 2856-2870. doi: 10.3799/dqkx.2021.136
    Citation: Zhang Lili, Jiang Sihong, Wang Huaikun, Meng Xiangxi, Zhang Shuai, Wu Yudong, 2022. Geochronology and Geochemical Features of the Ore-Related Granite in the Skarn Type Fe Polymetallic Deposits in Eastern Mongolia. Earth Science, 47(8): 2856-2870. doi: 10.3799/dqkx.2021.136

    蒙古国东部矽卡岩型铁多金属矿床成矿岩体年代学及地球化学

    doi: 10.3799/dqkx.2021.136
    基金项目: 

    《国家重点研发计划》项目 2017YFC0601303

    中国地质调查局项目《全球矿产资源储量动态评估》 DD20211410

    详细信息
      作者简介:

      张莉莉(1987-), 女, 博士, 主要从事金属矿床成矿规律研究.ORCID: 0000-0001-6406-1994.E-mail: zhanglili331@163.com

      通讯作者:

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

    • 中图分类号: P595;P597;P612

    Geochronology and Geochemical Features of the Ore-Related Granite in the Skarn Type Fe Polymetallic Deposits in Eastern Mongolia

    • 摘要: 为探讨蒙古-鄂霍茨克洋演化有关的金属成矿问题,对蒙古国东部哈拉特乌拉Fe⁃Zn矿床花岗闪长斑岩和查希尔Fe⁃Mo矿床黑云母二长花岗岩开展了锆石U⁃Pb年代学、岩石地球化学和Hf同位素组成研究.成矿岩体的年龄分别为278 Ma和258 Ma,均富钾、碱,富集轻稀土元素和大离子亲石元素(K、Rb),亏损高场强元素(Nb、Ta、Ti),属高钾钙碱性I型花岗岩. 锆石εHft)值分别为6.6~9.8和6.9~11.1,Hf两阶段模式年龄分别为672~877 Ma和568~855 Ma,表明岩体母岩浆源于新元古代亏损地幔形成的新生地壳的部分熔融. 哈拉特乌拉和查希尔矽卡岩型铁多金属矿床成矿岩体应是蒙古-鄂霍茨克洋板块南东向俯冲的产物,间接证明了蒙古-鄂霍茨克洋板块开始向南东俯冲的时间应早于278 Ma.

       

    • 图  1  蒙古国主要金属矿床分布

      底图据Badarch et al.(2002)Tang et al.(2016)

      Fig.  1.  Location of main ore deposits in Mongolia

      图  2  哈拉特乌拉Fe⁃Zn矿区地质

      1. 第四系;2. 下二叠统安山岩、英安岩、流纹岩、凝灰岩、角砾岩;3. 中元古界大理岩、大理岩化灰岩、片岩;4. 花岗岩;5. 花岗闪长斑岩;6. 矽卡岩;7. 矿体及编号;8. 隐伏矿体及编号;9. 勘探线;10. 断层

      Fig.  2.  Geological map of the Haraat Uul Fe⁃Zn ore district

      图  3  哈拉特乌拉Fe⁃Zn矿床A0号勘探线剖面

      1. 第四系;2. 灰岩、大理岩化灰岩;3. 花岗闪长斑岩;4. 矽卡岩;5. 锌矿体及编号;6. 磁铁矿体及编号;7. 钻孔编号及位置;8. 钻孔深度

      Fig.  3.  Geological section along No.A0 exploration line of the Haraat Uul Fe⁃Zn ore district

      图  4  查希尔Fe⁃Mo矿区地质

      1. 新生界;2. 下泥盆统希尔嘎乌拉组:泥质、砂质灰岩和安山质凝灰岩;3. 黑云母二长花岗岩;4. 辉绿岩;5. 磁铁矿体;6. 矽卡岩;7. 钻孔及编号;8. 勘探线

      Fig.  4.  Geological map of the Tsahir Fe⁃Mo ore district

      图  5  查希尔Fe⁃Mo矿床Ⅱ号矿体100线剖面

      Fig.  5.  Geological section along No.100 exploration line of the Tsahir Fe⁃Mo ore district

      图  6  哈拉特乌拉花岗闪长斑岩(样品号: HL⁃8)和查希尔黑云母二长花岗岩(样品号: CXE⁃2)岩相学特征

      a. 采坑内的花岗闪长斑岩;b. 花岗闪长斑岩主要矿物组成(正交光);c. 花岗闪长斑岩中的角闪石和斜长石(正交光);d. 花岗闪长斑岩中的磁铁矿(反射光);e. 岩心中的黑云母二长花岗岩;f. 黑云母二长花岗岩主要矿物组成(正交光);g. 黑云母二长花岗岩中的副矿物(正交光);h. 黑云母二长花岗岩中的黄铁矿(反射光);Qtz. 石英;Kfs. 钾长石;Pl. 斜长石;Bi. 黑云母;Mt. 磁铁矿;Py. 黄铁矿;Zr. 锆石;Ap. 磷灰石;Amp. 角闪石

      Fig.  6.  Petrographic characteristic of the granodiorite porphyry (Sample No. HL⁃8)in the Haraat Uul deposit and the biotite monzogranite (Sample No. CXE⁃2) in the Tsahir deposit

      图  7  哈拉特乌拉矿区花岗闪长斑岩锆石CL图像(a)和U⁃Pb谐和图(b);查希尔矿区黑云母二长花岗岩锆石CL图像(c)U⁃Pb谐和图(d)

      Fig.  7.  Zircon CL images (a) and U⁃Pb concordia diagrams(b) for the granodiorite porphyry in Haraat Uul Fe⁃Zn deposit; zircon CL images (c) and U⁃Pb concordia diagrams(d) for thebiotite monzogranite in Tsahir Fe⁃Mo deposit

      图  8  哈拉特乌拉矿区花岗闪长斑岩和查希尔矿区黑云母二长花岗岩SiO2 vs. K2O图解(底图据Rickwood, 1989)(a); A/CNK vs. A/NK图解(底图据Irvine and Baragar, 1971)(b); 球粒陨石标准化稀土元素配分曲线(c); 原始地幔标准化微量元素蛛网图(d)

      标准化数据据Sun and Mcdonough(1989)

      Fig.  8.  Diagrams for the granodiorite porphyry in Haraat Uul Fe-Zn depositand biotite monzogranite in Tsahir Fe-Mo deposit showing: (a) SiO2 vs. K2O (modified after Rickwood, 1989); (b) A/CNK vs. A/NK (modified after Irvine and Baragar, 1971); (c) Chondrite-normalised REE patterns; and (d) primitive mantle normalised element spider patterns

      图  9  哈拉特乌拉矿区花岗闪长斑岩和查希尔矿区黑云母二长花岗岩10 000×Ga/Al vs. FeOT/MgO图解(a); SiO2 vs. FeOT/(FeOT+MgO)图解(b)

      底图依次据Whalen et al.(1987)Frost et al.(2001)

      Fig.  9.  Diagrams for the granodiorite porphyryte porphyry in Haraat Uul Fe⁃Zn deposit and biotite monzogranite in Tsahir Fe⁃Mo deposit showing: (a) 10 000×Ga/Al vs. FeOT/MgO; (b) SiO2 vs. FeOT/(FeOT+MgO)

      图  10  哈拉特乌拉矿区花岗闪长斑岩和查希尔矿区黑云母二长花岗岩Rb⁃(Y+Nb)图

      底图据Pearce et al.(1984);Syn⁃COLG. 同碰撞花岗岩;VAG. 火山弧花岗岩;WPG. 板内花岗岩;ORG.大洋中脊花岗岩

      Fig.  10.  Diagram of Rb versus (Y+Nb) for granodiorite porphyry in Haraat Uul Fe⁃Zn deposit and biotite monzogranite in Tsahir Fe⁃Mo deposit

      图  11  研究区构造-岩浆-成矿演化模式图

      Fig.  11.  Cartoon showing the proposed geodynamics⁃petrogenetic⁃metallogenic model for the study area

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    出版历程
    • 收稿日期:  2021-05-13
    • 刊出日期:  2022-09-25

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