深反射大炮揭示的青藏高原侧向碰撞带地壳骨架结构

酆少英, 李秋生, 邓小娟, 李井元, 熊小松, 卢占武, 李文辉, 王晓冉, 吴庆宇, 石金虎. 2020. 深反射大炮揭示的青藏高原侧向碰撞带地壳骨架结构. 地球物理学报, 63(3): 828-839, doi: 10.6038/cjg2020N0271
引用本文: 酆少英, 李秋生, 邓小娟, 李井元, 熊小松, 卢占武, 李文辉, 王晓冉, 吴庆宇, 石金虎. 2020. 深反射大炮揭示的青藏高原侧向碰撞带地壳骨架结构. 地球物理学报, 63(3): 828-839, doi: 10.6038/cjg2020N0271
FENG ShaoYing, LI QiuSheng, DENG XiaoJuan, LI JingYuan, XIONG XiaoSong, LU ZhanWu, LI WenHui, WANG XiaoRan, WU QingYu, SHI JinHu. 2020. Crustal skeleton structure of the lateral collision zone of the Qinghai-Tibet Plateau revealed by large-shot set of deep-reflecting profiling. Chinese Journal of Geophysics (in Chinese), 63(3): 828-839, doi: 10.6038/cjg2020N0271
Citation: FENG ShaoYing, LI QiuSheng, DENG XiaoJuan, LI JingYuan, XIONG XiaoSong, LU ZhanWu, LI WenHui, WANG XiaoRan, WU QingYu, SHI JinHu. 2020. Crustal skeleton structure of the lateral collision zone of the Qinghai-Tibet Plateau revealed by large-shot set of deep-reflecting profiling. Chinese Journal of Geophysics (in Chinese), 63(3): 828-839, doi: 10.6038/cjg2020N0271

深反射大炮揭示的青藏高原侧向碰撞带地壳骨架结构

  • 基金项目:

    国家深地资源勘查开采重点专项(2016YFC0600302),国家自然科学基金项目(41574092,41674140)和自然资源部深地动力学重点实验室自主研究课题(J1901-3)联合资助

详细信息
    作者简介:

    酆少英, 男, 1967年生, 河南南阳人, 高级工程师, 长期从事地壳深浅结构的反射地震探测与研究.E-mail:fsy.ny@163.com

    通讯作者: 李秋生, 男, 1958年生, 河北邢台人, 研究员, 博导, 长期从事大陆岩石圈结构探测与地球动力学研究.E-mail:lqs1958@163.com
  • 中图分类号: P313;P315

Crustal skeleton structure of the lateral collision zone of the Qinghai-Tibet Plateau revealed by large-shot set of deep-reflecting profiling

More Information
  • 青藏高原东南缘处于印度板块与欧亚板块碰撞的侧翼,揭示该地区的岩石圈结构有助于完整理解青藏高原碰撞造山的动力学过程,对构建大陆碰撞成矿理论框架至为关键.本研究对横过青藏高原侧向碰撞带的一条深反射地震剖面的15个大炮资料,进行了针对性静校正、去噪等处理和单次叠加成像,结果剖面显示了侧向碰撞带岩石圈结构的骨架特征:(1)双程走时(TWT)8~10 s的强反射(Tc)将地壳分为上、下两层;Tc可能是大型滑脱构造的拆离面,其存在使上地壳的变形与下地壳解耦;(2)Moho间断面反射(Tm)为3~4个同相轴的窄带反射波组,横向不连续,与深大断裂交汇处被错断,但断距不大;(3)在兰坪—思茅地块下方TWT21 s和扬子克拉通西缘下方TWT22~24 s存在相向倾斜的反射波组(TL);以Tc、Tm和TL构成的骨架结构,定性地描绘出剖面下方岩石圈地幔以汇聚为主、地壳块体以侧向滑移为主和上地壳为薄皮逆冲或滑脱的分层动力学模式.该岩石圈变形样式明显不同于以正向碰撞挤压、地壳缩短垂向增厚为主的"冈底斯模式".

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  • 图 1 

    青藏高原侧向碰撞带深地震反射测线位置图

    Figure 1. 

    Location map of deep seismic reflection profile in the lateral collision zone of the Qinghai-Tibet Plateau

    图 2 

    大炮原始记录

    Figure 2. 

    The original record of large-shot

    图 3 

    层析静校正前(左)、后(右)原始记录对比

    Figure 3. 

    Comparison of original records before (left) and after (right) tomographic statics

    图 4 

    处理后的单炮记录

    Figure 4. 

    Single shot record after processing

    图 5 

    青藏高原侧向碰撞带单次叠加剖面及地壳骨架结构

    Figure 5. 

    Single stack section of the lateral collision zone on the Qinghai-Tibet Plateau

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出版历程
收稿日期:  2019-09-18
修回日期:  2020-01-17
上线日期:  2020-03-05

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