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    西藏南部米拉山地区早侏罗世花岗岩地球化学特征及其地质意义

    于云鹏 解超明 王明 范建军 董宇超 郝宇杰

    于云鹏, 解超明, 王明, 范建军, 董宇超, 郝宇杰, 2019. 西藏南部米拉山地区早侏罗世花岗岩地球化学特征及其地质意义. 地球科学, 44(7): 2295-2307. doi: 10.3799/dqkx.2019.023
    引用本文: 于云鹏, 解超明, 王明, 范建军, 董宇超, 郝宇杰, 2019. 西藏南部米拉山地区早侏罗世花岗岩地球化学特征及其地质意义. 地球科学, 44(7): 2295-2307. doi: 10.3799/dqkx.2019.023
    Yu Yunpeng, Xie Chaoming, Wang Ming, Fan Jianjun, Dong Yuchao, Hao Yujie, 2019. Geochemical Features and Geological Significance of Early Jurassic Granites in Milashan Area, Southern Tibet. Earth Science, 44(7): 2295-2307. doi: 10.3799/dqkx.2019.023
    Citation: Yu Yunpeng, Xie Chaoming, Wang Ming, Fan Jianjun, Dong Yuchao, Hao Yujie, 2019. Geochemical Features and Geological Significance of Early Jurassic Granites in Milashan Area, Southern Tibet. Earth Science, 44(7): 2295-2307. doi: 10.3799/dqkx.2019.023

    西藏南部米拉山地区早侏罗世花岗岩地球化学特征及其地质意义

    doi: 10.3799/dqkx.2019.023
    基金项目: 

    吉林大学研究生创新基金资助项目 419020201369

    国家自然科学基金项目 41702227

    国家自然科学基金项目 41602230

    中国地质调查局区域地质调查项目 DD20160015

    详细信息
      作者简介:

      于云鹏(1993-), 男, 在读博士, 矿物学、岩石学、矿床学专业

      通讯作者:

      解超明

    • 中图分类号: P534.5

    Geochemical Features and Geological Significance of Early Jurassic Granites in Milashan Area, Southern Tibet

    • 摘要: 中南拉萨地块内部早侏罗世时期岩浆岩的成因差异对新特提斯洋的早期演化具有指示意义,本次工作选取位于洛巴堆-米拉山断裂带两侧的宗沃花岗岩体和仲达花岗岩体作为研究对象,进行详细的岩相学、年代学和全岩地球化学分析.锆石U-Pb定年结果分别为193.8±2.2 Ma和197.5±1.8 Ma,指示了区内的早侏罗世岩浆事件.宗沃花岗岩与仲达花岗岩样品均具有较高的SiO2含量(69.80%~74.64%)与较低的A/CNK值(0.98~1.07),且富集轻稀土元素及Rb、Th、K等大离子亲石元素,亏损Nb、Ta、Ti等高场强元素.全岩地球化学特征指示两处样品均属典型的Ⅰ型火山弧岩浆岩.结合前人的研究成果表明,中南拉萨地块内部的早侏罗世岩浆岩形成于新特提斯洋北向俯冲下的陆内弧环境.本次工作的研究结果结合区域内早侏罗世岩浆岩的全岩地球化学和同位素数据,指示南拉萨地块内早侏罗世岩浆岩主要来源于新生下地壳,而中拉萨地块内早侏罗世岩浆岩的岩浆源区存在着更多古老下地壳成分的加入.

       

    • 图  1  青藏高原构造简图(a);拉萨地块地质简图(b);米拉山地区地质简图(c);宗沃岩体花岗岩(d和e);仲达岩体花岗岩(f和g)

      图a据李才等(2006)修改;图b据Zhu et al.(2011)修改;图c据和钟铧等(2006)修改. JSSZ.金沙江缝合带;LSSZ.龙木错-双湖-澜沧江缝合带;BNSZ.班公湖-怒江缝合带;IYZSZ.印度-雅鲁藏布江缝合带;SNMZ.狮泉河-纳木错蛇绿混杂岩带;LMF.洛巴堆-米拉山断裂带;Pl.斜长石;Kfs.钾长石;Qtz.石英;Bt.黑云母.图b中早侏罗世岩浆岩年龄数据来自于Chu et al.(2006)张宏飞等(2007), 陈炜等(2011)Zhu et al.(2011)董昕和张泽明(2013)Guo et al.(2013)水新芳等(2016)Meng et al.(2016)王旭辉等(2018), 舒楚天等(2018), 邹洁琼等(2018)Xie et al.(2018)

      Fig.  1.  Tectonic framework of Tibetan Plateau (a); geological map of the Lhasa subterrane (b); geological map of Milashan area (c); field photographs and photomicrographs of granites from the Zongwo (d, e) and Zhongda plutons (f, g)

      图  2  宗沃岩体和仲达岩体花岗岩Na2O+K2O-SiO2(a)、K2O-SiO2(b)、A/NK-A/CNK(c)及Zr-10 000×Ga/Al(d)图解

      图a据Middlemost(1994);图b实线据Peccerillo and Taylor(1976),虚线据Middlemost(1986);图c据Maniar and Piccoli(1989);图d据Whalen et al.(1987),其中早侏罗世岩浆岩全岩地球化学数据来源与图 1相同

      Fig.  2.  Na2O+ K2O-SiO2 (a), K2O-SiO2 (b), A/NK-A/CNK (c) and Zr-10 000×Ga/Al (d) diagrams of granites from the Zongwo and Zhongda plutons

      图  3  宗沃岩体和仲达岩体花岗岩球粒陨石标准化稀土元素配分曲线图和原始地幔标准化微量元素蛛网图

      球粒陨石标准化值和原始地幔标准化值据Sun and McDonough(1989);图中早侏罗世岩浆岩全岩地球化学数据来源与图 1相同

      Fig.  3.  Chondrite-normalized REE patterns and primitive mantle normalized muti-element diagrams for the granites from the Zongwo and Zhongda plutons

      图  4  宗沃岩体和仲达岩体花岗岩锆石阴极发光(CL)图像

      Fig.  4.  Cathodoluminescence (CL) images of zircons from the Zongwo and Zhongda plutons

      图  5  宗沃岩体和仲达岩体花岗岩锆石U-Pb谐和图

      Fig.  5.  U-Pb concordia diagrams of zircons from the Zongwo and Zhongda plutons

      图  6  宗沃岩体和仲达岩体花岗岩Rb-Y+Nb(a)、Nb-Y(b)、Y-Zr(c)及Th/Ta-Yb(d)构造判别图解

      图a据Pearce et al.(1984);图b实线据Pearce et al.(1984);图c据Müller and Groves(1994);图d据Whalen et al.(1987),其中早侏罗世岩浆岩全岩地球化学数据来源与图 1相同

      Fig.  6.  Rb-Y+Nb(a), Nb-Y(b), Y-Zr(c) and Th/Ta-Yb(d)tectonic discrimination diagrams of granites from the Zongwo and Zhongda plutons

      图  7  中南拉萨地块内部早侏罗世岩浆岩年龄、主微量元素含量及比值变化图解

      图中早侏罗世岩浆岩全岩地球化学数据来源与图 1相同

      Fig.  7.  Age, major and trace element concentration and ratios diagrams for Early Jurassic magmatic rocks in the central and southern Lhasa subterrane

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    • 收稿日期:  2018-11-30
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