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Radiocarbon Dating of Fugendake Volcano in Unzen, SW Japan

Published online by Cambridge University Press:  09 February 2016

Sheng Xu ,
Hideo Hoshizumi ,
Kozo Uto  and
Stewart P H T Freeman
Sheng Xu*
Affiliation:
Scottish Universities Environmental Research Centre, East Kilbride G75 0QF, United Kingdom JAEA Tono Geoscience Center, Toki, Gifu 509–5102, Japan
Hideo Hoshizumi
Affiliation:
Geological Survey of Japan, Tsukuba, Ibaraki 305-8567, Japan
Kozo Uto
Affiliation:
Geological Survey of Japan, Tsukuba, Ibaraki 305-8567, Japan
Stewart P H T Freeman
Affiliation:
Scottish Universities Environmental Research Centre, East Kilbride G75 0QF, United Kingdom
*
Corresponding author. Email: [email protected].
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Abstract

This article presents new radiocarbon ages for the lavas, pyroclastic flow, and lahar deposits that originated from the Fugendake and Mayuyama volcanoes of the Younger Unzen Volcano, SW Japan. Nine charcoal samples were collected from the lavas and pyroclastic flow deposits, and 17 soil samples from the underlying volcanic-related products. This data set, together with previously published ages (thermoluminescence, K-Ar, fission track, and 14C), yielded new information about the timing of Late Pleistocene eruptions and an improved understanding of the evolution of the Fugendake and Mayuyama volcanoes. Fugendake Volcano started to build within the scar of Myokendake around 29 cal ka BP, and its eruption products spread over the flank of Myokendake. The remarkable eruptions of Fugendake Volcano included the lava and pyroclastic flow deposits around 22, 17, 12, and 4.5 cal ka BP. Subsequent historical eruptions occurred in AD 1663, 1792, and 1991–1995. Developed on the eastern extension of Fugendake Volcano, Mayuyama Volcano was active during the building stage of Fugendake at 4.5 cal ka BP. This study also identified a pumice eruption at ∼10 ka and 2 volcanic-related lahar deposits around 1.6 and 0.7 ka, which need to be addressed in future research.

Type
Unusual Applications of 14C Measurement
Information
Radiocarbon , Volume 55 , Issue 3: Proceedings of the 21st International Radiocarbon Conference (Part 2 of 2) , 2013 , pp. 1850 - 1861
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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