14C dating of soil samples from the Unzen volcano scientific drilling boreholes

Soil samples were collected from the upper layers of two Unzen volcano Scientific Drilling Project boreholes and dated by radiocarbon using accelerator mass spectrometry (AMS). The humic soils underlying volcanic related lahar flow deposits at a depth of 56.42 m of the USDP-1 borehole gave a 14C age...

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Bibliographic Details
Published inNuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Vol. 223-224; pp. 560 - 567
Main Authors Xu, Sheng, Hoshizumi, Hideo, Ochiai, Yoji, Aoki, Harumi, Uto, Kozo
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2004
Subjects
AMS 14C dating
Soil carbon fraction
Unzen volcano
AMS 14C dating
Soil carbon fraction
07.75
91.35.Nm
91.40.−k
Unzen volcano
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Summary:Soil samples were collected from the upper layers of two Unzen volcano Scientific Drilling Project boreholes and dated by radiocarbon using accelerator mass spectrometry (AMS). The humic soils underlying volcanic related lahar flow deposits at a depth of 56.42 m of the USDP-1 borehole gave a 14C age of 18.8 kaBP, suggesting that the accumulation of the lahar flow deposits was caused by the Kureishibaru pyroclastic eruption (19 kaBP) dated at the surface. The humic soils underlying a pyroclastic flow deposit at depths of 71.60–71.90 m of the USDP-2 borehole gave 14C ages of 27.5 and 29.3 kaBP at the top and bottom layers, respectively. This reveals that the initial activity of Fugendake volcano occurred around 27 kaBP and the collapse of Myokendake volcano around 29 kaBP.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2004.04.104