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    北秦岭高压-超高压岩石的时空分布、P-T-t演化及其形成机制

    陈丹玲 刘良 廖小莹 任云飞 宫相宽

    陈丹玲, 刘良, 廖小莹, 任云飞, 宫相宽, 2019. 北秦岭高压-超高压岩石的时空分布、P-T-t演化及其形成机制. 地球科学, 44(12): 4017-4027. doi: 10.3799/dqkx.2019.256
    引用本文: 陈丹玲, 刘良, 廖小莹, 任云飞, 宫相宽, 2019. 北秦岭高压-超高压岩石的时空分布、P-T-t演化及其形成机制. 地球科学, 44(12): 4017-4027. doi: 10.3799/dqkx.2019.256
    Chen Danling, Liu Liang, Liao Xiaoying, Ren Yunfei, Gong Xiangkuan, 2019. The Distribution, P-T-t Evolution and Formation Mechanism of HP-UHP Metamorphic Rocks in the North Qinling Orogenic Belt. Earth Science, 44(12): 4017-4027. doi: 10.3799/dqkx.2019.256
    Citation: Chen Danling, Liu Liang, Liao Xiaoying, Ren Yunfei, Gong Xiangkuan, 2019. The Distribution, P-T-t Evolution and Formation Mechanism of HP-UHP Metamorphic Rocks in the North Qinling Orogenic Belt. Earth Science, 44(12): 4017-4027. doi: 10.3799/dqkx.2019.256

    北秦岭高压-超高压岩石的时空分布、P-T-t演化及其形成机制

    doi: 10.3799/dqkx.2019.256
    基金项目: 

    国家重点基础研究发展计划项目 2015CB856103

    国家自然科学基金项目 41472053

    国家自然科学基金项目 41430209

    详细信息
      作者简介:

      陈丹玲(1967-), 女, 教授, 从事岩石大地构造研究

    • 中图分类号: P581

    The Distribution, P-T-t Evolution and Formation Mechanism of HP-UHP Metamorphic Rocks in the North Qinling Orogenic Belt

    • 摘要: 北秦岭构造带早古生代的构造格局和演化过程一直是地学界比较关注也是存在较大争议的问题之一.在已有研究基础上,系统总结了本课题组近年来在北秦岭早古生代高压-超高压变质作用研究方面的进展,从变质作用角度对北秦岭早古生代的构造演化提供重要限定.丹凤斜长角闪岩中柯石英的发现为区内超高压变质作用的存在提供了最直接的矿物学证据;东秦岭秦岭杂岩中的斜长角闪岩普遍经历了高压-超高压榴辉岩相变质,具面状分布的特征,是陆壳俯冲/深俯冲作用的产物;高压-超高压榴辉岩和围岩片麻岩都记录了顺时针的P-T-t轨迹,峰期变质时代为500~490 Ma,之后主体又经历约470~450 Ma和约420~400 Ma两期抬升退变质叠加和部分熔融作用;高压-超高压岩石两期退变质和部分熔融发生的时代与北秦岭460~440Ma和~420Ma的两期岩浆事件的时代一致,说明北秦岭早古生代岩浆作用是深俯冲陆壳板片断离和碰撞造山结束后地壳伸展作用的岩浆响应;高压-超高压榴辉岩原岩形成时代约800 Ma,具有与南秦岭新元古代中晚期岩浆岩一致的地球化学特征,北秦岭超高压岩石的形成可能是商丹洋关闭后洋壳拖曳着南秦岭陆壳物质向北发生大陆深俯冲的结果,商丹洋在500 Ma主体应该已经关闭;秦岭岩群是部分而不是整体经历了大陆的深俯冲,现今的秦岭岩群是一个俯冲碰撞杂岩带而不是一个岩石地层单元或微陆块;北秦岭早古生代造山作用在中泥盆世已经结束,整体处于构造隆升后的剥蚀阶段,是南秦岭刘岭群碎屑岩的主要蚀源区,刘岭群沉积盆地形成于碰撞造山后的伸展构造背景而非弧前环境.

       

    • 图  1  区域地质简图

      a.中国中西部构造地质简图;b.北秦岭构造带构造地质简图(据Wang et al., 2013)

      Fig.  1.  Sketch geological map

      图  2  丹凤斜长角闪岩锆石中的包裹体及其激光拉曼谱图

      Coe.柯石英;Omp.绿辉石;Grt.石榴子石;Rt.金红石;Zrn.锆石.据宫相宽等(2016)

      Fig.  2.  Representative photographs and Raman spectra of mineral inclusions in zircons from Danfeng amphibolite

      图  3  松树沟退变榴辉岩石榴石和锆石中绿辉石包裹体及基质中残留的绿辉石

      Amp.角闪石;Zrn.锆石;Pl.斜长石;Ttn.榍石;Ilm.钛铁矿;Ep.绿帘石;Cpx.单斜辉石;Omp.绿辉石;Ap.磷灰石.据陈丹玲等(2015)

      Fig.  3.  The omphacite inclusions in garnet and zircon and relic omphacite in matrix of Songshugou retrograde eclogite

      图  4  北秦岭高压-超高压变质榴辉岩及围岩片麻岩的年龄统计结果

      数据引自Liu et al.(2016)宫相宽(2017)廖小莹(2018)及其参考文献

      Fig.  4.  Summary of ages for HP-UHP eclogites and host gneisses in the NQOB

      图  5  北秦岭高压-超高压岩石的P-T-t轨迹

      廖小莹(2018)

      Fig.  5.  The P-T-t paths of HP-UHP rocks in the NQOB

      图  6  北秦岭高压-超高压榴辉岩的地球化学特征

      Fig.  6.  The geochemical characteristics of HP-UHP eclogites in the NQOB

      图  7  北秦岭古生代高压-超高压变质岩(a)、花岗岩(b)和刘岭群碎屑锆石(c)的年龄统计结果

      花岗岩数据张成立等(2013);变质岩和碎屑岩数据来自Liao et al.(2017)宫相宽(2017)廖小莹(2018)

      Fig.  7.  Summary of ages for HP-UHP rocks (a) and Paleozoic granitoids (b) in the NQOB, detrital zircons in the Liuling Group (c)

      图  8  北秦岭早古生代构造演化简图

      Liu et al. (2016)修改

      Fig.  8.  Schematic cartoons showing the Early Paleozoic tectonic evolution of the North Qinling orogenic belt

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    • 收稿日期:  2019-09-10
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