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    内蒙古达茂旗胡吉尔特晚泥盆世蛇绿岩的发现及其地质意义

    李尚林 王训练 段俊梅 龙文华 马伯永 杨文瑞

    李尚林, 王训练, 段俊梅, 龙文华, 马伯永, 杨文瑞, 2012. 内蒙古达茂旗胡吉尔特晚泥盆世蛇绿岩的发现及其地质意义. 地球科学, 37(1): 18-24. doi: 10.3799/dqkx.2012.002
    引用本文: 李尚林, 王训练, 段俊梅, 龙文华, 马伯永, 杨文瑞, 2012. 内蒙古达茂旗胡吉尔特晚泥盆世蛇绿岩的发现及其地质意义. 地球科学, 37(1): 18-24. doi: 10.3799/dqkx.2012.002
    LI Shang-lin, WANG Xun-lian, DUAN Jun-mei, LONG Wen-hua, MA Bo-yong, YANG Wen-rui, 2012. Findings and Its Geological Significance of the Upper Devonian Ophiolite in Hujierte Area, Damao County, Inner Mongolia, China. Earth Science, 37(1): 18-24. doi: 10.3799/dqkx.2012.002
    Citation: LI Shang-lin, WANG Xun-lian, DUAN Jun-mei, LONG Wen-hua, MA Bo-yong, YANG Wen-rui, 2012. Findings and Its Geological Significance of the Upper Devonian Ophiolite in Hujierte Area, Damao County, Inner Mongolia, China. Earth Science, 37(1): 18-24. doi: 10.3799/dqkx.2012.002

    内蒙古达茂旗胡吉尔特晚泥盆世蛇绿岩的发现及其地质意义

    doi: 10.3799/dqkx.2012.002
    基金项目: 

    国家自然科学基金项目 40172014

    南亚地区基础地质图件编制与成矿地质背景研究项目 1212011120333

    详细信息
      作者简介:

      李尚林(1961-),男,博士,教授级高级工程师,从事地层学及区域地质研究.E-mail: shanglinli@tom.com

    • 中图分类号: P535

    Findings and Its Geological Significance of the Upper Devonian Ophiolite in Hujierte Area, Damao County, Inner Mongolia, China

    • 摘要: 在内蒙古胡吉尔特一带进行1∶50 000区域地质调查,发现超基性岩、堆积杂岩、辉绿岩墙群及基性枕状熔岩夹大洋放射虫硅泥质岩组合,呈现典型的蛇绿岩特征,其地球化学资料显示为大洋中脊环境.锆石U-Pb年龄为371.0±5.3 Ma,为晚泥盆世.表明这一地区晚古生代有洋壳存在,是古亚洲洋的一部分,可能为西伯利亚板块与中朝板块之间多岛洋古地理格局中洋盆的一支,并非位于中朝板块内部,推测中朝板块的北缘位于胡吉尔特一带之南.

       

    • 图  1  内蒙古及邻区蛇绿岩分布(据唐克东和邵济安,1996修改)

      1.第四系松散沉积物;2.上白垩统二连组;3.中二叠统哲斯组;4.上石炭统本巴图组;5.基性枕状熔岩夹含放射虫硅泥质岩组合;6.堆积杂岩及中酸性侵入岩;7.超基性岩(夸大表示)、辉绿岩墙群(夸大表示);8.中新生代沉积盖层;9.中生代陆屑-碳酸盐沉积;10.晚古生代裂谷堆积;11.晚泥盆-早石炭世盖层沉积;12.志留-泥盆纪火山-沉积杂岩;13.晚志留世磨拉石;14.早古生代弧后沉积;15.新元古代和早古生代陆缘沉积;16.太古宙和元古宙结晶基底;17.花岗岩;18.奥陶纪火山弧;19.蛇绿岩;20.蛇绿混杂岩;21.断层;22.韧性剪切带、平移断层、逆断层及其倾角;23.不整合界线、地质界线;24.晚泥盆世蛇绿岩带;25.前人划分的晚泥盆世蛇绿岩带;26.锆石U-Pb法371.0±5.3 Ma年的采样位置

      Fig.  1.  Distribution map of the ophiolite in Inner Mongolia and its adjacent area

      图  2  玄武岩及细碧岩中的枕状构造

      Fig.  2.  Photograph of pillow structure from basalt and spilite

      图  3  基性火山熔岩图解

      a.K2O-SiO2图解(据Gill,1981);b.硅-碱图解(据Irvine and Baragar, 1971);c.AFM图解(据Irvine and Baragar, 1971);d.FeOt-MgO-Al2O3图解(据Irvine and Baragar, 1971).A.扩张中心;B.岛弧及大陆活动边缘岛屿;C.MORB;D.大洋岛;E.大陆;图例编号与表 1样品序号一致

      Fig.  3.  The diagrams for basic lava

      图  4  稀土元素配分曲线

      a.基性枕状熔岩;b.堆积杂岩及中酸性侵入岩.图 4a中,1~2.硅化角砾状玄武岩;3.蚀变玄武岩;4.杏仁状玄武岩;5.气孔状玄武岩;6.蚀变角斑岩;7.球粒石英角斑岩;8.细碧岩.图 4b中,1~5.中细粒斜长花岗岩;6~7.中细粒石英闪长岩;8~10.细粒闪长岩;11~13.细粒角闪辉长岩;14~17.细粒辉长岩

      Fig.  4.  Chondrite normalized REE distribution

      图  5  堆积杂岩及中酸性侵入岩图解

      a.硅-碱图解(据Irvine and Baragar, 1971);b.AFM图解(据Irvine and Baragar, 1971);c.K2O-SiO2图解(据Maniar and Piccoli, 1989);1~5.中细粒斜长花岗岩,6~8.中细粒石英闪长岩,9~11.细粒闪长岩,12~14.细粒角闪辉长岩,15~18.细粒辉长岩;OP.大洋;IAG.岛弧花岗岩类;CAG.大陆弧花岗岩类;CCG.大陆碰撞花岗岩类;RRG.与列谷的花岗岩类;CEUG.陆内造陆运动降起花岗岩类;POG.造山后花岗岩类

      Fig.  5.  The diagrams for cumulate complexes and intermediate-acidic intrusive rocks

      图  6  堆积杂岩及中酸性侵入岩微量元素构造环境判别图解

      A.板内;B.火山弧;C.洋中脊(据Pearce and Norry, 1979);1~4.中细粒斜长花岗岩,5~6.中细粒石英闪长岩,7~9.细粒闪长岩,10.细粒角闪辉长岩,11~12.细粒辉长岩

      Fig.  6.  The trace elements tectonic discrimination diagram for cumulate complexes and intermediate-acidic intrusive rocks

      表  1  基性枕状熔岩的主量元素分析结果(%)

      Table  1.   Major elements (%) analytic data of basic pillow lava

      序号 样品号 岩石名称 SiO2 Al2O3 Fe2O3 FeO TiO2 CaO MgO K2O Na2O MnO P2O5 灼减 总量
      1 6P1Gs2-1 硅化角砾状玄武岩 55.43 14.94 8.92 2.16 0.55 8.27 2.44 0.18 2.38 0.13 0.08 5.10 100.58
      2 6P1Gs2-2 硅化角砾状玄武岩 49.72 16.94 7.87 5.76 0.58 6.94 4.04 0.18 2.18 0.23 0.41 5.68 100.53
      3 6P2Gs3-2 蚀变玄武岩 54.99 15.80 6.19 3.90 0.33 8.52 3.89 0.38 3.25 0.13 0.38 1.46 99.22
      4 6P2Gs23-2 玄武岩 57.89 15.06 4.74 4.80 0.32 6.66 3.29 0.36 2.99 0.23 0.15 3.71 100.20
      5 6P3Gs7 杏仁状玄武岩 50.35 14.91 3.60 7.79 1.40 6.28 6.59 0.32 4.53 0.24 0.13 4.08 100.22
      6 6P3Gs12-1 气孔状玄武岩 59.55 14.88 6.17 3.83 0.76 2.91 2.50 0.17 5.78 0.12 0.20 2.84 99.71
      7 6Gs0189 蚀变玄武岩 53.65 13.05 6.51 5.95 2.50 5.16 4.45 0.39 4.78 0.21 0.29 3.17 100.11
      8 6Gs1037 杏仁状玄武岩 61.49 14.03 4.60 3.34 1.05 3.10 2.82 0.29 6.21 0.11 0.73 2.30 100.07
      9 6Gs4022-4 蚀变角斑岩 59.28 16.87 2.25 5.86 0.81 5.17 2.19 0.39 4.84 0.11 0.07 1.50 99.34
      10 6P7Gs31-1 球粒石英角斑岩 70.21 13.16 2.82 2.38 0.27 2.80 0.96 0.08 5.43 0.04 0.05 1.11 99.31
      注:内蒙古自治区地质矿产实验研究所完成;采用经典法分析.
      下载: 导出CSV
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