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Activity of the Funai Fault and Radiocarbon Age Offsets of Shell and Plant Pairs from the Latest Pleistocene to Holocene Sediments Beneath the Oita Plain, Western Japan

Published online by Cambridge University Press:  16 November 2017

Toshimichi Nakanishi ,
Keiji Takemura ,
Hisanori Matsuyama ,
Shoichi Shimoyama ,
Wan Hong  and
Mitsuru Okuno
Toshimichi Nakanishi*
Affiliation:
AIG Collaborative Research Institute for International Study on Eruptive History and Informatics, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Noguchibaru, Beppu, Oita, 874-0903, Japan
Keiji Takemura
Affiliation:
Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Noguchibaru, Beppu, Oita, 874-0903, Japan
Hisanori Matsuyama
Affiliation:
Oyo Corporation, Kanda-Mitoshiro-cho 7-9F, Chiyoda-ku, Tokyo, 101-8486, Japan
Shoichi Shimoyama
Affiliation:
Institute of Lowland and Marine Research, Saga University, Honjyo 1, Saga, 840-8502, Japan
Wan Hong
Affiliation:
Geochemical Analysis Center, Korea Institute of Geoscience & Mineral Resources, 124 Gwahak-ro, Yuseong-gu, Daejeon, 305-350, Republic of Korea
Mitsuru Okuno
Affiliation:
AIG Collaborative Research Institute for International Study on Eruptive History and Informatics, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan Department of Earth System Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
*
*Corresponding author. Email: [email protected].
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Abstract

Beppu Bay is located on east-central Kyushu, southwest Japan, and is characterized by hydrothermal activity, tectonic deformation, and recent volcanism under the influence of convergence of the Philippine Sea plate. This area, occupying the western portion of an arc-bisecting dextral fault system, is a tectonic depression that has existed since ca. 5 Ma. Sedimentary facies, mollusk assemblages, and radiocarbon (14C) ages of 25 terrestrial plant fragments and 16 marine carbonate shells from a 70-m drill core were determined to estimate the activity of the Funai Fault, which consists of normal faults along the southern margin of the tectonic basin. Based on the analysis, six sedimentary facies, namely braided river channel, estuary, prodelta, delta front, delta plain, and artificial soil, were identified. The vertical slip rate was calculated as 2.6–2.7 mm/yr based on displacements of the braided river channel sediments of the last glacial period and the base of Kikai-Akayoya tephra in the Holocene highstand sediments of this area. Reservoir ages during 6180–10,410 cal BP were determined from marine shell and terrestrial plant pairs from the sediments of the estuary, prodelta and delta front facies, and were correlated with values from a northern coast of Kyushu and the Korean Peninsula.

Keywords

marine reservoirnormal faultradiocarbon datingsedimentary facies
Type
Applications
Information
Radiocarbon , Volume 59 , Special Issue 6: 8th International Symposium, Edinburgh, 27 June – 1 July, 2016 Part 2 of 2 , December 2017 , pp. 1737 - 1748
Copyright
© 2017 by the Arizona Board of Regents on behalf of the University of Arizona 

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Footnotes

Selected Papers from the 8th Radiocarbon & Archaeology Symposium, Edinburgh, UK, 27 June–1 July 2016

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