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[B-1.2 Study on the Formation of Sedimentary Particles from Marine Particulate Matter and the Related Carbon Cycle]

[Contact Person]

Hodaka Kawahata
Senior Researcher
Marine Geology Department, Geological Survey of Japan
Higashi 1-1-3, Tsukuba, Ibaraki, 305, Japan
phone +81-298-54-3765, Fax +81-298-54-3533
E-mail kawahata@gsj.go.jp

[Total Budget for FY1995]

19,271,000 Yen

[Abstract]

　We took surface sediments as well as sinking particulate matter from the Ontong Java Plateau in the equatorial Pacific. The purposes of this study are to clarify the mechanism of the formation of sedimentary particles from sinking particulate matter during early diagenesis and to evaluate the fluxes of organic carbon and carbonate through the water column and in the surface sediments.
　About 98% of organic matter was decomposed between the sediment trap(1.1km deep) and surface sediments. The relative abundance of organic carbon reserved in surface sediments was about 0.08% of primary productivity. It was in the range of 0.10-0.11% obtained from moderate to high productivity area of West Caroline Basin, Hess Rise and Arabia Sea to 0.008% obtained from low productivity area in Northern North Pacific.

[Key Words]

Sedimentary particles, sinking particles, marine particulate matter, organic carbon, carbonate carbon