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[B-10.3 Evaluation of The Holocene Sea-Level Changes and Climatic Changes around The Japan Sea(Final Report)]

[Contact Person]

Yoshiki Saito
Senior Research Scientist
Marine Geology Department, Geological Survey of Japan
Higashi 1-1-3, Tsukuba, Ibaraki 305, Japan
Phone +81-298-54-3772, Fax. +81-298-54-3533
E-mail yoshi@gsj.go.jp

[Total Budget for FY1993-1995]

27,654,000 Yen (FY 1995;9,176,OOO Yen)

[Abstract]

　The relationship between paleo-coastal environment and sea-level changes has been studied using eight borehole samples taken from Mine Bay and Nita Bay of Tsushima Island, Lake Kushu-ko in Rebun Island, Lake Otadomari-numa in Rishiri Island, and Lake Kamo-ko in Sado Island in the Japan Sea. The sedimentary facies and distribution of accumulation rates in Nita Bay and Mine Bay show that intertidal to subtidal zone is a major depositional center during the rise of sea level and this sediment consists of coarser materials with abundant plant fragments. Bay-mouth barriers formed by abundant sediment supply due to coastal erosion and coastal lagoons are characteristics during the rise of sea level in Lake Kushu-ko, Lake Otadomari-numa and Lake Kamo-ko during the sea-level rise. The coastal sedimentary environment of these areas is greatly influenced by the Holocene sea-level changes.

[Key Words]

Sea-level change, Sea-level rise, Holocene, PAGES, Japan Sea, Tsushima Warm Current