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HOLOCENE OVERWASH OCCURRENCE AGE IN THE ISUMI RIVER LOWLAND, EASTERN BOSO PENINSULA, JAPAN

Published online by Cambridge University Press:  06 December 2023

Soichiro Oda Open the ORCID record for Soichiro Oda [Opens in a new window] ,
Stephen P Obrochta Open the ORCID record for Stephen P Obrochta [Opens in a new window] ,
Osamu Fujiwara ,
Yusuke Yokoyama Open the ORCID record for Yusuke Yokoyama [Opens in a new window] ,
Yosuke Miyairi  and
Yoshiya Hatakeyama
Soichiro Oda
Affiliation:
Graduate School of International Resource Science, Akita University, 1-1 Tegata Gakuen-machi, Akita 010-8502, Japan
Stephen P Obrochta*
Affiliation:
Graduate School of International Resource Science, Akita University, 1-1 Tegata Gakuen-machi, Akita 010-8502, Japan
Osamu Fujiwara
Affiliation:
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, AIST Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
Yusuke Yokoyama
Affiliation:
Atmosphere and Ocean Research Institute, Tokyo University, 5-1-5, Kashiwanoha, Kashiwa-shi, Chiba 277-8564, Japan
Yosuke Miyairi
Affiliation:
Atmosphere and Ocean Research Institute, Tokyo University, 5-1-5, Kashiwanoha, Kashiwa-shi, Chiba 277-8564, Japan
Yoshiya Hatakeyama
Affiliation:
Graduate School of International Resource Science, Akita University, 1-1 Tegata Gakuen-machi, Akita 010-8502, Japan
*
*Corresponding author. Email: obrochta@gipc.akita-u.ac.jp
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Abstract

Analysis of the chronological data and observation of a lagoonal sediment core reveal sand washover events between around 2.4 to 2.5 cal. ky BP in the Isumi River lowland. We conducted radiocarbon dating with AMS and constructed an age-depth model using the latest calibration curve and appropriate model routine. In the middle to lower part of the core, dark-gray sand layers are repeatedly deposited. Sand layers may exhibit an erosional surface at the base with fining upward grading. The overwash layers are composed of well-rounded sand with occasional gravel, indicative of transportation. overwash sediment characteristics are consistent with proximal marine deposits, suggesting an ocean origin (though riverine sediment is also similar in character). The age-depth model indicates very high sediment accumulation rates associated with overwash deposits. Based on the amount of accumulated sediment, relatively large-scale redeposition events occurred during this period but more information is needed to constrain the mechanism(s) causing the events. We also present a local reservoir age correction compatible with the Marine20 calibration curve.

Keywords

age depth modeloverwashradiocarbon AMS dating
Type
Conference Paper
Information
Radiocarbon , First View , pp. 1 - 11
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of University of Arizona

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Footnotes

Selected Papers from the 24th Radiocarbon and 10th Radiocarbon & Archaeology International Conferences, Zurich, Switzerland, 11–16 Sept. 2022

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