Sedimentation rates in Kagoshima Bay, Southwestern Japan, using the210Pb method

H Kofuji,K Yokota,M Inoue,H Maeda

doi:10.1051/epjconf/20122404004

H Kofuji, K Yokota + Show 2 more

Open Access

https://doi.org/10.1051/epjconf/20122404004

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Abstract

To understand the pattern of sedimentation rates as fundamental physical parameter of coastal environment, the 210 Pb dating method was applied to core samples collected from Kagoshima Bay, Southwestern Japan. The sedimentation rate varied at each location within the bay (0.08–0.30 g·cm−2 ·y−1 ), and the rate at the bay-head area was less than that at the centre of the bay. The inventory of ex210 Pb has a lower value in the bay-head area. The low ex210 Pb inventory at Stn.5' is considered to be due to physical, and chemical conditions in the bay-head area.

Highlights

Kagoshima Bay lies on a volcanic front of southwestern Japan, where several calderas form a line from the north to the south
To understand the pattern of sedimentation rates as fundamental physical parameter of coastal environment, the 210Pb dating method was applied to core samples collected from Kagoshima Bay, Southwestern Japan
To understand the pattern of sedimentation rates as fundamental physical parameter of coastal environment, the 210Pb dating method was employed to core samples collected from this bay

Summary

Introduction

Kagoshima Bay lies on a volcanic front of southwestern Japan, where several calderas form a line from the north to the south. The mouth of the bay opens to the East China Sea. Submerged calderas are connected by a narrow and shallow channel, and the bay head area is a semi-closed bay Submerged calderas are connected by a narrow and shallow channel, and the bay head area is a semi-closed bay The 210Pb (T1/2 = 22.3 y) method has routinely been used for dating the upper layers of various lake and/or marine sediments. Measuring the sedimentation rate using the 210Pb method is based on atmospherically derived 210Pb, which is referred to as excess 210Pb (ex210Pb). To understand the pattern of sedimentation rates as fundamental physical parameter of coastal environment, the 210Pb dating method was employed to core samples collected from this bay

Sampling and method

Result and discussion