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首页> 外文期刊>Journal of Asian earth sciences >Provenance analysis of the Miocene accretionary prism of the Hengchun Peninsula, southern Taiwan, and regional geological significance
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Provenance analysis of the Miocene accretionary prism of the Hengchun Peninsula, southern Taiwan, and regional geological significance

机译：台湾南部恒春半岛中新世增生棱镜的物源分析及区域地质意义

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摘要

Petrographic analysis, detrital zircon U-Pb geochronology and Neodymium isotope are applied to the Middle-Late Miocene turbidite sequences in the Hengchun accretionary prism, southern Taiwan, to constrain the provenance and nature of sedimentation in the Manila subduction system. Both petrographic study and detrital zircon U-Pb ages show that the Middle-Late Miocene turbidite sequences were primarily derived from Mesozoic granites and volcanic rocks of the Cathaysian Block in SE China, which were transported southeastward via rivers like Minjiang and Jiulongjiang to the Taiwan area. This conclusion is further supported by Nd isotope analyses of shales intercalated within sandstone sequences showing negative εNd values (-13.3 to -10.5) of a continental origin. During the Late Miocene when global sea-level fell significantly, the SE China coastline shifted seaward to the eastern part of the present Taiwan Strait, which would have facilitated these continent-derived sediments being transported southeastward to the shelf-upper slope of the Chinese continental margin. These turbidite sequences were then deformed and accreted into the accretionary prism of the Hengchun Peninsula when the South China Sea oceanic lithosphere subducted eastward beneath the Philippine Sea Plate in the Late Miocene. Our study suggests that sedimentary deposition of the turbidite sequences in the Hengchun Peninsula could be strongly controlled by different river system supply, submarine channeling transport and fluctuations of sea-level.
机译：在台湾南部恒春增生棱镜中，将岩相分析，碎屑锆石U-Pb年代学和钕同位素应用于中新世中新世浊积岩层序，以限制马尼拉俯冲系统中沉积物的来源和性质。岩石学研究和碎屑锆石U-Pb年龄都表明，中晚新世浊积岩层序主要来自中国东南部华夏区块的中生代花岗岩和火山岩，然后通过Min江和九龙江等河流向东南输送到台湾地区。插入砂岩层序的页岩的Nd同位素分析进一步显示了这一结论，该分析表明大陆起源的εNd值为负（-13.3至-10.5）。在中新世晚期，当全球海平面显着下降时，东南中国海岸线向海移动到目前的台湾海峡东部，这将有利于将这些源自大陆的沉积物向东南方输送到中国大陆的陆架上斜坡。余量。然后，当中新世晚期南海大洋岩石圈向菲律宾海板下方向东俯冲时，这些浊质体序列变形并积聚到恒春半岛的增生棱镜中。我们的研究表明，恒春半岛浊积岩层序的沉积沉积可能受不同的河流系统供应，海底通道运输和海平面波动的强烈控制。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第5期|26-39|共14页
  • 作者

    Xinchang Zhang; Yi Yan; Chi-Yue Huang; Duofu Chen; Yehua Shan; Qin Lan; Wenhuang Chen; Mengming Yu;

  • 作者单位

    Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

    Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China,Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan;

    Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan;

    Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

    Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China,University of Chinese Academy of Sciences, Beijing 100049, China;

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  • 正文语种 eng
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  • 关键词

    Provenance; Taiwan; Hengchun accretionary prism; Turbidite sequences;

    机译：种源台湾;恒春增生棱镜;浊度序列;

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