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AMS Radiocarbon Dates of Pyroclastic-Flow Deposits on the Southern Slope of the Kuju Volcanic Group, Kyushu, Japan

Published online by Cambridge University Press:  07 November 2016

Mitsuru Okuno ,
Shinji Nagaoka ,
Yoko Saito-Kokubu ,
Toshio Nakamura  and
Tetsuo Kobayashi
Mitsuru Okuno*
Affiliation:
AIG Collaborative Research Institute for International Study on Eruptive History and Informatics; also Department of Earth System Science, Faculty of Science, Fukuoka University, Fukuoka 814-0180, Japan
Shinji Nagaoka
Affiliation:
Formerly Nagasaki University, Nagasaki 852-8521, Japan (passed away on 10 July 2011)
Yoko Saito-Kokubu
Affiliation:
Tono Geoscience Center, Japan Atomic Energy Agency, 959-31 Jorinji, Toki, Gifu 509-5102, Japan
Toshio Nakamura
Affiliation:
Division for Chronological Research, Institute for Space-Earth Environmental Research, Nagoya University, Nagoya 464-8601, Japan
Tetsuo Kobayashi
Affiliation:
Emeritus Professor, Kagoshima University, Kagoshima 890-0065, Japan
*
*Corresponding author. Email: okuno@fukuoka-u.ac.jp.
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Abstract

The Kuju volcanic group, located in central Kyushu, Japan, consists of small stratovolcanoes and lava domes. To refine the eruptive history of the group, we conducted accelerator mass spectrometry (AMS) radiocarbon dating of charcoal fragments from three pyroclastic-flow (PF) deposits on the southern slope. The obtained 14C dates are consistent with the geomorphology, stratigraphy, and thermoluminescence (TL) ages. The Handa PF deposits, which are products of the largest eruption of the group, were dated to ~53.5 ka BP. The Shirani and Muro PF deposits, which are block-and-ash flows, were dated to 44 to >50 cal ka BP and 35–39 cal ka BP, respectively. These ages can be correlated with TL ages for lava domes. This study demonstrates that the lava domes and associated PF deposits formed after the Handa eruption.

Keywords

Kuju volcanic groupAMS radiocarbon datingpyroclastic-flow depositslava dome
Type
Cosmogenic Isotopes in Studies of Soil Dynamics
Information
Radiocarbon , Volume 59 , Special Issue 2: Proceedings of the 22nd International Radiocarbon Conference (Part 1 of 2) , April 2017 , pp. 483 - 488
Copyright
© 2016 by the Arizona Board of Regents on behalf of the University of Arizona 

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Footnotes

Selected Papers from the 2015 Radiocarbon Conference, Dakar, Senegal, 16–20 November 2015

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