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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Structures within the oceanic crust of the central South China Sea basin and their implications for oceanic accretionary processes
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Structures within the oceanic crust of the central South China Sea basin and their implications for oceanic accretionary processes

机译：中南海域盆地海洋外壳内的结构及其对海洋增生过程的影响

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摘要

Internal structures in mature oceanic crust can elucidate understanding of the processes and mechanism of crustal accretion. In this study, we present two multi-channel seismic (MCS) transects across the northern flank of the South China Sea basin to reveal the internal structures related to Cenozoic tectono-magmatic processes during seafloor spreading. Bright reflectors within the oceanic crust, including the Moho, upper crustal reflectors, and lower crustal reflectors, are clearly imaged in these two transects. The Moho reflection displays varied character in continuity, shape and amplitude from the continental slope area to the abyssal basin, and becomes absent in the central part of the basin where abundant seamounts and seamount chains formed after the cessation of seafloor spreading. Dipping reflectors are distinct in most parts of the MCS data but generally confined to the lower crust above the Moho reflection. These lower crustal reflectors merge downward into the Moho without offsetting it, probably arising from shear zones between the crust and mantle characterized by interstitial melt, although we cannot exclude other possibilities such as brittle faulting or magmatic layering in the local area. A notable feature of these lower crustal reflector events is their opposite inclinations. We suggest the two groups of conjugate lower crustal reflector events observed between magnetic anomalies C11 and C8 were associated with two unusual accretionary processes arising from plate reorganizations with southward ridge jumps. (C) 2018 The Author(s). Published by Elsevier B.V.
机译：成熟海外地壳中的内部结构可以阐明对地壳增生的过程和机制的认识。在这项研究中，我们在南海盆地北侧侧面展示了两个多通道地震（MCS）横断面，以揭示海底蔓延期间与新生代构造岩岩工艺相关的内部结构。在这两个横断面清楚地成像海底内的亮反射器，包括Moho，上层地壳反射器和下层地壳反射器。 Moho反射在大陆坡面积到深海坡度的连续性，形状和幅度中显示各种特征，并且在盆地的中央部分缺席，在海底蔓延后形成的丰富的海山和海山链。浸渍反射器在MCS数据的大多数部分中是不同的，但通常限制在Moho反射高于下的地壳。这些较低的地壳反射器向下合并到MOHO中而不抵消它，可能从地壳和地幔之间的剪切区域产生，尽管我们不能排除局域在局域中的其他可能性，例如脆性断层或岩浆层。这些较低的地壳反射器事件的一个值得注意的特征是它们的相反倾斜度。我们建议在磁性异常C11和C8之间观察到的两组缀合的较低地壳反射器事件与南脊跳跃的板重组产生的两个不寻常的增生过程相关。 （c）2018年作者。由elsevier b.v出版。

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