ハイドロアイソスタシ-と西九州の水中遺跡 (東アジアと日本の遺跡をめぐる古環境特集号)

概要

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There are a number of underwater Jomon sites along the west coast of Kyushu. Their ages are about 6, 000-5, 000yrs BP, and they are several meters below the present sea-level. The main cause of the sinking of these Jomon sites seems to be hydro-isostatic adjustment after the last deglaciation. The relative sea-levels inferred from these underwater Jomon sites seem to be consistent with crustal tilting related to the postglacial hydro-isostatic adjustment. Thus these observations will place important constraints on our understanding of the rheological structure of the upper mantle in the island-arc areas. The age and the depth of the Takashima underwater Jomon site are respectively about 8, 500yrs BP and -25m, which are consistent with the hydro-isostatic relative sea-level in the late glacial phase, and are useful for evaluating the melting history of both the polar ice caps. It is desirable to conduct more systematic observations in these regions in order to define the mantle rheology and the late Pleistocene and early Holocene melting histories of both polar ice caps.
日本第四紀学会の論文