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Coral Reef Evolution at the Leeward Side of Ishigaki Island, Southwest Japan

Published online by Cambridge University Press:  18 July 2016

Hiroya Yamano
Affiliation:
Social and Environmental Systems Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-0053, Japan. Email: [email protected].
Osamu Abe
Affiliation:
Graduate School of Environmental Studies, Nagoya University, Furo, Chikusa, Nagoya 464-8601, Japan
Hiroyuki Kitagawa
Affiliation:
Graduate School of Environmental Studies, Nagoya University, Furo, Chikusa, Nagoya 464-8601, Japan
Etsuko Niu
Affiliation:
Nagoya University Center for Chronological Research, Furo, Chikusa, Nagoya 464-8602, Japan
Toshio Nakamura
Affiliation:
Nagoya University Center for Chronological Research, Furo, Chikusa, Nagoya 464-8602, Japan
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Abstract

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In comparison with windward coral reefs, the facies and evolution of leeward coral reefs has been discussed to a lesser extent. By accelerator mass spectrometry (AMS) carbon-14 dating of coral specimens collected from the trench excavated across a modern coral reef during a fishery port repair, we revealed the internal facies and Holocene evolution of a leeward reef in Ishigaki Island, Ryukyu Islands, southwest Japan. The reef facies can be split into three facies: the tabular Acropora framework facies, the tabular Acropora reworked facies, and the unconsolidated bioclast facies. The tabular Acropora reworked facies first formed a ridge by 3500 BR Then, the tabular Acropora framework facies grew both upward and seaward. The accumulation rates of the tabular Acropora framework facies ranged from 2.2 to 8.3 m/ka. Thus, the reef framework facies and accumulation rates of this leeward reef is similar to those of windward reefs, although the age of the reef top is younger than that of windward reefs.

Type
II. Our ‘Wet’ Environment
Copyright
Copyright © 2001 by the Arizona Board of Regents on behalf of the University of Arizona 

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