首页> 外文期刊>Journal of Asian earth sciences >Age spectra of detrital zircon of the Jurassic clastic rocks of the Mino-Tanba AC belt in SW Japan: Constraints to the provenance of the mid-Mesozoic trench in East Asia
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Age spectra of detrital zircon of the Jurassic clastic rocks of the Mino-Tanba AC belt in SW Japan: Constraints to the provenance of the mid-Mesozoic trench in East Asia

机译:日本西南部Mino-Tanba AC带侏罗纪碎屑锆石碎屑锆石的年龄谱:对东亚中生代海沟起源的限制

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摘要

U-Pb ages of detrital zircon grains were determined from an upper Middle Jurassic siliceous mudstone and two lower Upper Jurassic sandstones of the Mino-Tanba belt, Southwest Japan, by Laser-ablation ICPMS. The age spectra of detrital zircon grains of the three analyzed samples show multiple age clusters: 175-198 Ma (Early Jurassic), 202-284 Ma (Permian to Triassic), 336-431 Ma (Silurian to Carboniferous), and 1691-2657 Ma (Neoarchean to Paleoproterozoic). As per the Precambrian grains, the prominent peak exists around 1800-2000 Ma in all analyzed samples. The age clusters of 175-198 Ma, 202-284 Ma. and 336-431 Ma suggest that pre-Middle Jurassic Japan has exposed older granitic batholiths. The corresponding batholiths occur in the Cathaysian part of South China block. In contrast, the absence of them in modern Japan suggests that these batholiths were totally consumed by post-Jurassic tectonic erosion. The Neoarchean to Paleoproterozoic detrital zircon grains were derived from South China, North China, or possibly both of them; nonetheless, the circumstantial geologic lines of evidence point to South China, in particular to Cathaysia, rather than North China.
机译:通过激光烧蚀ICPMS从日本西南部美浓-丹巴带的上中侏罗统硅质泥岩和两块下侏罗统砂岩中确定了碎屑锆石的U-Pb年龄。三个分析样品的碎屑锆石颗粒的年龄谱显示出多个年龄群:175-198 Ma(早侏罗世),202-284 Ma(二叠纪至三叠纪),336-431 Ma(Silurian至石炭纪)和1691-2657马(新元古代至古元古代)。根据前寒武纪晶粒,所有分析样品中的突出峰均出现在1800-2000 Ma附近。年龄群为175-198 Ma,202-284 Ma。 Ma和336-431 Ma认为,侏罗纪中期以前的日本已经暴露出较老的花岗岩岩基。相应的岩床发生在华南地块的华夏地区。相反,现代日本没有它们,这表明这些岩基被侏罗纪后的构造侵蚀所完全消耗。新元古代至古元古代碎屑锆石的晶粒来自华南,华北或两者皆有。尽管如此,环境地质学证据指向的是华南,特别是华夏,而不是华北。

著录项

  • 来源
    《Journal of Asian earth sciences》 |2014年第1期|62-73|共12页
  • 作者单位

    Department of Earth and Planetary Science, Tokyo Institute of Technology, O-okayama. Meguro, Tokyo 152-8551, Japan;

    Department of Earth Science and Astronomy, The University of Tokyo, Komaba, Meguro, Tokyo 153-8902, Japan;

    Center for Geo-Environmental Science, Graduate School of Engineering and Resource Science, Akita University, Akita 010-8502, Japan;

    Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan;

    Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan;

    Earth-Life Science Institute, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152-8551, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Jurassic; Accretionary complex; U-Pb age; Detrital zircon; Provenance; Cathaysia;

    机译:侏罗纪增生综合体;U-Pb年龄;碎屑锆石;种源华夏;

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