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首页> 外文期刊>Journal of Asian earth sciences >Crustal structure and variation in the southwest continental margin of the South China Sea: Evidence from a wide-angle seismic profile
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Crustal structure and variation in the southwest continental margin of the South China Sea: Evidence from a wide-angle seismic profile

机译：南海西南大陆边缘的地壳结构和变化：来自广角地震型材的证据

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摘要

A 680-km long wide-angle seismic profile was acquired in the southwest continental margin (SWCM) of the South China Sea to better understand its crustal variation and continental extension. By using two-dimensional forward ray-tracing, and joint refraction and reflection travel time inversion methods, velocity structures of the SWCM are yielded. The model results show a hyper-stretched continental crust with a thickness of 10-18 km, which is variable under sedimentary basins and reef areas. Compared with beta wc, beta uc, and beta lc derived from the crustal thickness, the degree of the whole crust extension appears to be larger than that of the upper crust but lower than that of the lower crust, except for the model of 560-610 km. Thus, we infer that depth-dependent extension of the crust has occurred in the SWCM. High velocity bodies with velocities larger than 7.0 km/s are sporadically distributed in the lower crust, which might be related to the remnant Mesozoic arc that can be attributed to the subduction of the paleo-Pacific plate. The obvious low velocity anomaly with the maximum thinning crust below the boundaries of the Nansha Trough and Palawan-Borneo thrust wedge (PBTW) is interpreted as the frontal thrust of the PBTW.
机译：在南海的西南大陆边缘（SWCM）中获得了680公里的广角地震型材，以更好地了解其地壳变异和大陆延伸。通过使用二维正向射线跟踪，并屈服SWCM的速度结构。模型结果表明，厚度为10-18公里的超拉伸大陆地壳，在沉积盆地和珊瑚礁区域下变化。与βWC，Beta UC和βLC相比，来自地壳厚度的β液，整个地壳延伸的程度似乎大于上地壳的程度，但低于下层地壳的程度，除了560的模型之外610公里。因此，我们推出在SWCM中发生了地壳的深度依赖性延伸。具有大于7.0 km / s的速度的高速体均在下面地壳中分布，这可能与残余的中生岩弧有关，其可归因于古太平洋板的俯冲。明显的低速异常具有最大稀薄地壳低于南沙槽和Palawan-Bordeo推力楔（PBTW）的界限被解释为PBTW的正压。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第11期|104557.1-104557.10|共10页
  • 作者

    Wei Xiaodong; Ruan Aiguo; Ding Weiwei; Wu Zhaocai; Dong Chongzhi; Zhao Yanghui; Niu Xiongwei; Zhang Jie; Wang Chunyang;

  • 作者单位

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Peoples R China|Shanghai Jiao Tong Univ Sch Oceanog Shanghai Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Peoples R China|Shanghai Jiao Tong Univ Sch Oceanog Shanghai Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Crustal structure; High velocity bodies; Stretching factor; Southwest continental margin;

    机译：地壳结构;高速体;拉伸因子;西南大陆边缘;

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