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AMS Radiocarbon Dating of Holocene Tephra Layers on Ulleung Island, South Korea

Published online by Cambridge University Press:  18 July 2016

Mitsuru Okuno ,
Miki Shiihara ,
Masayuki Torii ,
Toshio Nakamura ,
Kyu Han Kim ,
Hanako Domitsu ,
Hiroshi Moriwaki  and
Motoyoshi Oda
Mitsuru Okuno*
Affiliation:
Dept. of Earth System Science, Faculty of Science, Fukuoka University, Fukuoka 814-0180, Japan
Miki Shiihara
Affiliation:
West Japan Engineering Consultants, Inc., Fukuoka 810-0004, Japan
Masayuki Torii
Affiliation:
Kumamoto Gakuen University, Kumamoto 862-8680, Japan
Toshio Nakamura
Affiliation:
Center for Chronological Research, Nagoya University, Nagoya 464-8602, Japan
Kyu Han Kim
Affiliation:
Dept. of Science Education, Ewha Womans University, Seoul 120-750, South Korea
Hanako Domitsu
Affiliation:
Dept. of Ecosystem Studies, School of Environmental Science, The University of Shiga Prefecture, Hikone 522-8533, Japan
Hiroshi Moriwaki
Affiliation:
Faculty of Law, Economics and Humanities, Kagoshima University, Kagoshima 890-0065, Japan
Motoyoshi Oda
Affiliation:
Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
*
Corresponding author. Email: okuno@fukuoka-u.ac.jp
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Abstract

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Ulleung Island, a large stratovolcano, is located in the western part of the Japan Sea (East Sea), 130 km off the eastern coast of the Korean Peninsula. The Ulleung-Oki (U-Oki) is a widely distributed tephra in and around the Japan Sea, and has an age of 10.7 cal ka BP obtained from the Lake Suigetsu data set (central Japan). Of the 7 tephra layers (U-7 to -1) on the island, the pumiceous U-4, U-3, and U-2 tephra layers are petrochemically and petrographically similar to the U-Oki tephra. To determine the eruption ages of 3 tephra layers on Ulleung Island, we conducted radiocarbon dating for 5 soil and 2 charcoal samples. Although the soil samples have the C/N ratios from 5 to 10, the obtained 14C dates are still consistent with the tephra stratigraphy of the island. The calibrated 14C dates for the U-4, U-3, and U-2 tephras are 11 cal ka BP, 8.3 or 9 cal ka BP, and 5.6 cal ka BP, respectively, indicating that the explosive eruptions occurred in the island with a time interval of 2000 to 3000 yr during the period of the early to middle Holocene. Based on our chronology, the U-4 tephra is most likely correlated with the U-Oki tephra.

Type
Soils and Sediments
Information
Radiocarbon , Volume 52 , Issue 3: 20th Int. Radiocarbon Conference Proceedings , 2010 , pp. 1465 - 1470
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

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