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Cooling of the lithosphere beneath the Nansha Block, South China Sea

机译：南海南沙区块下的岩石圈冷却

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摘要

Throughout the Late Cretaceous and Cenozoic, the Nansha Block experienced stretching and extension and moved southwards away from the South China continent. As an exotic micro-continent, the Nansha Block has markedly different lithospheric rheological properties from its surrounding regions. The temperature represents one of the key parameters controlling the dynamics and rheological behaviors of the lithosphere and mantle. Therefore, we calculated the 3D temperature field of the crust and upper mantle beneath the Nansha Block using two methods, namely, solving the heat conduction equation and inverting the S-wave velocity structure. The results show that the ratio of the crustal heat flow to the seafloor heat flow is greater than 50% in the central Nansha Block. The crustal temperatures in the Nansha Block are low. The temperature at the Moho discontinuity is approximately equal to the Curie temperature (523 degrees C). The temperatures of the shallow mantle (50 km) beneath the Nansha Block (800 degrees C) are lower than those of the surrounding areas. However, the cool mantle below the Nansha Block gradually transitions into a warm mantle with increasing depth. At a depth of 150 Km, the mantle temperatures beneath the Nansha Block (1600 degrees C) are higher than those of the surrounding areas. The bottom boundary of the "thermal" lithosphere beneath the Nansha Block is at approximately 100 km, which is deeper than that in the surrounding areas. This result is different from the bottom boundary of the "seismic" lithosphere at a depth of 80 km under the Nansha Block, which is similar to that in the surrounding areas. The low lithospheric temperatures beneath the Nansha Block imply that the lithosphere of the Nansha Block experienced a rapid cooling process.
机译：在整个晚白垩世和新生代，南沙地块经历了伸展和伸展，并从华南大陆向南移动。作为一个奇异的微大陆，南沙地块的岩石圈流变性质与其周围地区明显不同。温度是控制岩石圈和地幔动力学和流变行为的关键参数之一。因此，我们采用两种方法，即求解热传导方程和反转S波速度结构，计算了南沙地块下地壳和上地幔的3D温度场。结果表明，南沙中部地壳热流与海底热流之比大于50％。南沙地块的地壳温度低。 Moho不连续处的温度大约等于居里温度（523摄氏度）。南沙地块（800摄氏度）之下的浅地幔（50公里）的温度低于周围地区的温度。然而，随着深度的增加，南沙地块下方的凉爽地幔逐渐转变为温暖的地幔。在150 Km的深度处，南沙地块（1600摄氏度）之下的地幔温度高于周围地区的地幔温度。南沙地块下方的“热”岩石圈的底部边界大约在100 km处，比周围地区更深。该结果与南沙区块下方80 km深度的“地震”岩石圈底部边界不同，这与周围地区相似。南沙区块下方的岩石圈温度较低，这意味着南沙区块的岩石圈经历了快速的冷却过程。

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  • 来源
    《Journal of Asian earth sciences》 |2019年第3期|169-177|共9页
  • 作者

    Dong Miao; Zhang Jian; Wu Shi-Guo; Wang Bei-Yu; Ai Yi-Fei;

  • 作者单位

    Univ Chinese Acad Sci, Beijing 100049, Peoples R China|Chinese Acad Sci, Lab Marine Geophys & Georesources, Inst Deep Sea Sci & Engn, Sanyo 572000, Peoples R China;

    Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Univ Chinese Acad Sci, Beijing 100049, Peoples R China|Chinese Acad Sci, Lab Marine Geophys & Georesources, Inst Deep Sea Sci & Engn, Sanyo 572000, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Qingdao 266237, Peoples R China;

    Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Nansha; Lithosphere; Temperature; Heat flow; Seismic wave velocity;

    机译：南沙;岩石圈;温度;热流;地震波速度;

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