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首页> 外文期刊>Journal of Asian earth sciences >Seismic evidence for the crustal deformation and kinematic evolution of the Nansha Block, South China Sea
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Seismic evidence for the crustal deformation and kinematic evolution of the Nansha Block, South China Sea

机译：南海南沙块的地壳变形和运动进化的地震证据

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摘要

To understand the crustal deformation of the Nansha Block (NB), this study presents an interpretation of a recently acquired multichannel seismic profile that traverses the Southwest Subbasin (SWSB), the NB, and the Nansha Trough (NT). A total of six Cenozoic unconformities and three stratigraphic sequences are identified. On the basis of tectonic, structural and stratigraphic features, the NB is divided from northwest to southeast into two structural domains, namely, the Hyper-stretched and Forebulge Domains. Based on the interpretation of the seismic profile, the fault-derived and whole crustal extension factors (beta(f) and beta(c), respectively) for the NB are calculated. The calculation results show that beta(c) is greater than beta(f) in a limited space of appr. 200 km, where the crust underwent depth-dependent extension. We suggest that the crustal extensional pattern of the NB may be a combination of distal limited depth-dependent extension and proximal uniform extension. The interpretation of the unconformities is also used to calculated the fault-derived crustal extension at various stages. The two main extension stages, the syn-rift and syn-drift, account for appr. 70% and 25% of the total extension, respectively. A comparison with the seismic profiles of the eastern NB shows that the crustal extension along the continental margin of the NB is heterogeneous, with more significant crustal deformation on the west side of the NB. The heterogeneity of the crustal extension along the depth and margin may be related to the thermal condition and rheological structure of the crust or lithosphere.
机译：为了了解南沙块（NB）的地壳变形，本研究提出了一种最近获得的多通道地震曲线的解释，其穿过西南子巴西（SWSB），NB和NANSHA槽（NT）。共鉴定了总共六个新生代无关和三个地层序列。在构造，结构和地层特征的基础上，Nb从西北部分为东南部分为两个结构域，即超长拉伸和前脉冲域。基于地震剖面的解释，计算了Nb的断层衍生和整个地壳延伸因子（分别为Nb的全地壳延伸因子（β（F）和β（c）。计算结果表明，β（c）大于β（f）的β（f）在有限的应用空间中。 200公里，地壳接受了深度依赖的延伸。我们建议，Nb的地壳延伸模式可以是远端有限的深度依赖性延伸和近端均匀延伸的组合。不整合的解释也用于计算各个阶段的故障衍生的地壳扩展。两个主要的延长阶段，同步和同步漂移，占APP的差价。分别为70％和25％的总延期。与东部NB的地震曲线的比较表明，NB的NB欧式裕度的地壳延伸是异构的，在NB的西侧具有更大的地壳变形。沿着深度和边缘的地壳延伸的异质性可能与地壳或岩石圈的热条件和流变结构有关。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第11期|104536.1-104536.13|共13页
  • 作者

    Zhang Jialing; Wu Zhaocai; Shen Zhongyan; Dong Chongzhi; Wang Chunyang; Zhao Yanghui;

  • 作者单位

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou 310012 Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou 310012 Peoples R China|Shandong Univ Sci & Technol Coll Geodesy & Geomat Qingdao 266590 Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou 310012 Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou 310012 Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou 310012 Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou 310012 Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou 310012 Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou 310012 Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou 310012 Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou 310012 Peoples R China;

    Minist Nat Resources Key Lab Submarine Geosci Hangzhou 310012 Peoples R China|Minist Nat Resources Inst Oceanog 2 Hangzhou 310012 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Nansha Block; Seismic stratigraphy; Extension factors; Tectonic deformation;

    机译：南沙块;地震地层;延伸因子;构造变形;

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