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    IBM型洋内弧的形成机制:以祁秦增生杂岩带为例

    宋述光 杨立明

    宋述光, 杨立明, 2019. IBM型洋内弧的形成机制:以祁秦增生杂岩带为例. 地球科学, 44(12): 4167-4172. doi: 10.3799/dqkx.2019.276
    引用本文: 宋述光, 杨立明, 2019. IBM型洋内弧的形成机制:以祁秦增生杂岩带为例. 地球科学, 44(12): 4167-4172. doi: 10.3799/dqkx.2019.276
    Song Shuguang, Yang Liming, 2019. Formation of the IBM-Type Intra-Oceanic Arc: An Example from the Qi-Qin Accretionary Belt, China. Earth Science, 44(12): 4167-4172. doi: 10.3799/dqkx.2019.276
    Citation: Song Shuguang, Yang Liming, 2019. Formation of the IBM-Type Intra-Oceanic Arc: An Example from the Qi-Qin Accretionary Belt, China. Earth Science, 44(12): 4167-4172. doi: 10.3799/dqkx.2019.276

    IBM型洋内弧的形成机制:以祁秦增生杂岩带为例

    doi: 10.3799/dqkx.2019.276
    基金项目: 

    国家重点基础研究发展计划项目 2015CB856105

    国家自然科学基金项目 91955202

    国家自然科学基金项目 41572040

    中国地质调查局项目 DD20190370

    详细信息
      作者简介:

      宋述光(1963—), 男, 教授, 岩石学专业

    • 中图分类号: P581

    Formation of the IBM-Type Intra-Oceanic Arc: An Example from the Qi-Qin Accretionary Belt, China

    • 摘要: 岛弧的形成和演化对于理解板块构造和大陆生长有重要意义.祁连山-西秦岭一带发育两条不同类型的弧岩浆岩带,其北侧为北祁连增生杂岩带,由蛇绿岩、高压变质岩和大陆型弧岩浆岩带组成,形成时代为520~440 Ma.岩浆岩以中酸性火山岩-侵入岩为主,部分地区发育典型双峰式火山岩.南侧为祁秦增生杂岩带,由寒武纪蛇绿岩(525~490 Ma)和奥陶纪IBM型洋内弧岩浆岩(470~440 Ma)组成,蛇绿岩以拉脊山-永靖洋底高原型蛇绿岩为代表,蛇绿岩的上部熔岩部分由夏威夷型苦橄岩、板内碱性玄武岩和板内拉斑玄武岩组成,为大洋板块内部地幔柱活动产物.洋内弧岩浆岩以高镁玄武岩、玄武安山岩、高铝安山岩、玻安岩为主,局部发育赞岐岩.祁秦增生杂岩带的蛇绿岩和弧火山岩组合很好地说明洋底高原与海沟碰撞和俯冲带阻塞是造成俯冲带起始和新的洋内弧形成和发展主要因素.

       

    • 图  1  祁连-秦岭地质简图及祁秦增生杂岩带的分布

      Song et al.(2017)

      Fig.  1.  Skeleton geological map of the Qilian-Qinling orogens and distribution of the Qi-Qin accretionary complex belt

      图  2  祁-秦俯冲增生杂岩带及特提斯洋(包括昆仑洋)构造-岩浆演化模式

      Yang et al.(2018)

      Fig.  2.  Schematic model for the tectonic-magmatic evolution of the Qi-Qin accretionary complex belt and the Proto-Tethys ocean (including Kunlun ocean)

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    • 收稿日期:  2019-09-23
    • 刊出日期:  2019-12-15

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