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Radiocarbon Ages of Beach Rocks and Late Holocene Sea-Level Changes in the Southern Part of the Nansei Islands, Southwest of Japan

Published online by Cambridge University Press:  18 July 2016

Kunio Omoto
Kunio Omoto*
Affiliation:
Department of Geography, College of Humanities and Sciences, Nihon University, 25-40, 3 Chome, Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan. Email: omoto@chs.nihon-u.ac.jp
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Abstract

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Beach rock is a good indicator of the past sea levels, as it is considered to have been formed within the range of intertidal zone. Radiocarbon dates of beach rocks collected from Iriomote Island, Ishigaki Island, and Miyako Island, in the southern part of the Nansei Islands, indicate that the beach rocks were formed between around 4000 BP and 400 BP. Late Holocene sea-level changes were revealed based on the elevations and 14C dates of the beach rocks. The results indicate that the sea level was similar to the present one for at least the past 4000 BP. Isotopic fractionations (δ13C) of the beach rocks were between +9.40% and −0.08%, suggesting a different origin for calcium carbonate.

Type
II. Our ‘Wet’ Environment
Information
Radiocarbon , Volume 43 , Issue 2B: Proceedings of the 17th International Radiocarbon Conference (Part 2 of 3), Conference Editors: Israel Carmi, Elisabetta Boaretto , 2001 , pp. 887 - 898
Copyright
Copyright © 2001 by the Arizona Board of Regents on behalf of the University of Arizona 

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