Permian/Triassic boundary and carbon circulation in pelagic sediments of Southwest Japan(<Special issue>The global carbon cycle)

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  • 西南日本の遠洋性堆積物中のペルム-トリアス紀境界と炭素循環(<特集>地球における炭素の循環)
  • 西南日本の遠洋性堆積物中のペルムートリアス紀境界と炭素循環〔英文〕
  • セイナン ニホン ノ エンヨウセイ タイセキブツチュウ ノ ペルムートリアスキ

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Abstract

The Permian and Triassic boundary was recorded in bedded chert sequence of typical pelagic facies, Southwest Japan. The boundary is marked by sharp drop of radiolarian chert production and appearance of siliceous claystones. The marine deterioration toward the P/T boundary might be caused by waxing of Pangaea and additional isolation of the Paleo-Tethys from the Panthalassa by formation of continental chain which surrounded the eastern margin of the Paleo-Tethys. Organic black mudstones are characteristic above the boundary claystones, and also they show cyclic occurrence in subsequent Lower Triassic siliceous rocks of possible Smithian and Spathian. The organic black mudstones are high content of organic carbon i.e. 2-5%, and organic materials were regarded to have been derived from photosynthetic marine planktons. The P/T boundary organic black mudstones point out that high primary production is caused by nutrient supply, which occuppied oceanic surface after the terminal Permian mass extinction of marine planktons. This is possibly due to the break up of the continental chain and restoration of active oceanic circulation in the Paleo-Tethyan sea. Successive occurrence of organic material beds indicated an appearence of radiolarian blooming in supposed Smithian to Spathian time. Rhythmic occurrence of organic black mudstones and overlying black cherts represents an ordinary cyclic change of oceanic condition due to the high stand in sea level which fertilized marine organisms.

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