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Kibi Plateau: A stable-coherent tectonic unit in the active Japanese Islands.
Scientific Reports ( IF 3.8 ) Pub Date : 2020-03-02 , DOI: 10.1038/s41598-020-60448-x Takafumi Sonehara 1 , Koshi Yagi 1 , Hiroyuki Takeshita 1 , Kazumasa Aoki 2 , Shogo Aoki 3 , Yo-Ichiro Otofuji 4 , Tetsumaru Itaya 4, 5, 6
Scientific Reports ( IF 3.8 ) Pub Date : 2020-03-02 , DOI: 10.1038/s41598-020-60448-x Takafumi Sonehara 1 , Koshi Yagi 1 , Hiroyuki Takeshita 1 , Kazumasa Aoki 2 , Shogo Aoki 3 , Yo-Ichiro Otofuji 4 , Tetsumaru Itaya 4, 5, 6
Affiliation
The Kibi Plateau in the active Japanese Islands consists of mainly Permian to Cretaceous rocks that have been deeply weathered into a red soil, comprising a peneplain with U-shaped valley. Systematic geological analyses of the Eocene fluvial deposits revealed the paleo-rivers that existed in the eastern Asian continent and streamed out to the paleo-Pacific Ocean. Each paleo-river is traced in a flow line shape without any significant vertical and horizontal displacement. The Eocene shallow marine sediments in a possible coastal region have no relevant inclination. These geological data strongly suggest that the Kibi Plateau has been a stable-coherent tectonic unit since the Eocene through the opening of the Japan Sea and the associated quick rotation of SW Japan in the Middle Miocene. The Kibi Plateau region with a thick crust over 30 km existed as a stable eastern segment of the Asian continent in the Eocene. The Kibi Plateau tectonic unit drifted to the south without any destruction due to the peripheral successive tectonic events such as the Philippine Sea plate subduction and the reactivation of Median Tectonic Line. No subduction related arc volcanism since the Eocene has also influenced to preserve the stable tectonic unit.
中文翻译:
基比高原(Kibi Plateau):活跃的日本群岛中构造稳定的构造单元。
在活跃的日本群岛中的基比高原主要由二叠纪到白垩纪的岩石组成,这些岩石已被深深地风化成红色的土壤,包括带有U形谷的半平原。对始新世河流相沉积物的系统地质分析显示,古河流存在于东亚大陆,并流到古太平洋。每个古河都以流线形状描绘,没有任何明显的垂直和水平位移。可能的沿海地区的始新世浅海沉积物没有相关的倾角。这些地质数据有力地表明,自始新世以来,从日本海的开放以及日本西南部在中新世中期的快速旋转以来,基比高原一直是一个稳定一致的构造单元。在始新世,亚洲大陆一个稳定的东部地区存在着地壳超过30公里的基比高原地区。由于周边连续的构造事件,如菲律宾海板俯冲和中构造线的重新激活,基比高原构造单元向南漂移而没有任何破坏。由于始新世也影响了保持稳定的构造单元,因此没有与俯冲有关的弧形火山作用。
更新日期:2020-03-02
中文翻译:
基比高原(Kibi Plateau):活跃的日本群岛中构造稳定的构造单元。
在活跃的日本群岛中的基比高原主要由二叠纪到白垩纪的岩石组成,这些岩石已被深深地风化成红色的土壤,包括带有U形谷的半平原。对始新世河流相沉积物的系统地质分析显示,古河流存在于东亚大陆,并流到古太平洋。每个古河都以流线形状描绘,没有任何明显的垂直和水平位移。可能的沿海地区的始新世浅海沉积物没有相关的倾角。这些地质数据有力地表明,自始新世以来,从日本海的开放以及日本西南部在中新世中期的快速旋转以来,基比高原一直是一个稳定一致的构造单元。在始新世,亚洲大陆一个稳定的东部地区存在着地壳超过30公里的基比高原地区。由于周边连续的构造事件,如菲律宾海板俯冲和中构造线的重新激活,基比高原构造单元向南漂移而没有任何破坏。由于始新世也影响了保持稳定的构造单元,因此没有与俯冲有关的弧形火山作用。