沿岸ー海溝系における物質輸送過程について

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  • Studies on horizontal transport of organic materials in the continental shelf-trench system

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An aim of this work is to make clear the horizontal transport of organic materials in the continental shelf to the trench located in the extremely west margin of the Pacific plate along the Japan Islands. Thus, surface sediments, suspended particles and sinking particles were collected from the mouth of Tokyo Bay, Sagami Bay, Izu-Ogasawara Trench and Northwest basin of the North Pacific. δ^<13>C and Δ^<14>C of the organic matter of these particles were determined by mass spectrometry and accelerated mass spectromery respectively. Following results were obtained. Horizontal fluxes of total mass and organic carbon from Tokyo Bay to the adjacent continental shelf were governed by the rising and ebb tides. Higher horizontal mass flux of 7,235mg dry weight m^<-2> h^<-1> was obserbed in the ebb tide relative to that of the rising tide (2,148mg dry weight m^<-2> h^<-1>) at the mouth of Tokyo Bay. δ^<13>C and Δ^<14>C of organic carbon clearly indicated that the particulate organic materials were derived from the modern phytoplankton living in the surface of the waters. Organic carbon of the surface sediments, suspended particles and sinking particles collected in the Sagami Trough were analyzed for δ^<13>C and Δ^<14>C, of which values tended to decrease from the shallow coastal regions toward the deep trench environment. These data clearly indicated that organic particles once settled in the continental shelf and shelf slope were transported to the deep bottom of the trench with continuous repetition of the resuspension and sedimentation of the particles with decay of their organic matter to a great extent.

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