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Radiocarbon Ages and Isotope Fractionations of Beachrock Samples Collected from the Nansei Islands, Southwestern 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, 24–40, 3 Chome, Sakurajosui, Setagayaku, Tokyo 156–8550, Japan. Email: omoto@chs.nihon-u.ac.jp
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Abstract

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A total of 294 beachrock samples were collected from 116 sites on 15 islands in the Nansei Islands chain, southwestern Japan, and were radiocarbon dated. The beachrocks began to form at about 6900 BP and some are still under development in the islands. Values of isotope fractionations of different materials making up the beachrocks ranged between +9.4‰ and −5.7‰. Isotope fractionations outside the range of 0 ± 2‰ suggest that these beachrocks were strongly influenced by underground water and running freshwater when they were cemented. The sea level during the late Holocene has remained the same for at least the past 5000 yr, except for several uplifted coasts.

Type
Part II
Information
Radiocarbon , Volume 46 , Issue 2: Proceedings of the 18th International Radiocarbon Conference (Part 2 of 2), Conference Editors: Nancy Beavan Athfield, Rodger J Sparks , 2004 , pp. 539 - 550
Copyright
Copyright © The Arizona Board of Regents on behalf of the University of Arizona 

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