噴火湾コア(ST.30)の堆積年代とその意義

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  • Radiocarbon Ages of shell fragments from marine sediment of Funka Bay, Southern Hokkaido, Japan

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Abstract

A gravity core (246cm) was obtained from the central part of Funka Bay at lat. 42° 16.2' N, log. 140° 36.0' E and water depth of 91m during cruise of the R/V Oshoro-Maru. The core is composed mainly of homogeneous, olive grayish colored silty mud which shows two intercalated ash layers at depths of 0-35cm and 202-227cm. Except for these two ash layers, no turbidity current or slumping related structures were identified based on sedimentological (visual and soft X ray) observation. The core were examined using AMS ^<14>C dating measurement to reconstruct the paleoenvironment in this area. The result of AMS ^<14>C dating for six shell fragments indicates that the average sedimentation rate is approximately >0.9mm/yr.

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