Interstadial coral reef terraces and relative sea-level changes during marine oxygen isotope stages 3-4, Kikai Island, central Ryukyus, Japan

Keiichi Sasaki, Akio Omura, Kazuo Murakami, Natsume Sagawa, Toru Nakamori

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Coral reef terraces are one of the best recorders of relative sea-level changes during the last glacial cycle. Thus far, knowledge of relative sea-level record based on coral reefs during the marine Oxygen Isotope Stage (OIS) 3 has been limited to studies of the Huon Peninsula, Papua New Guinea. High-precision a α -spectrometric 230Th/234U dating demonstrated an offlapping sequence of five coral reef complexes, ages of which are ∼66, ∼64, ∼62, ∼55 and ∼52 ka, in the northern part of Kikai Island, central Ryukyus of Japan. Interstadial reefs, characterized by deepening-upward sequences of coral assemblages, recorded three hemicycles from transgression to highstand at ∼52, ∼62, and ∼66 ka, during which these reefs were drowned. These highstands in the relative sea-level record can be correlated with the eustatic record reconstructed from the Huon reef terraces and with the interstadials 14, 18, and 19 of the GISP 2 oxygen isotope record. This consistency confirms the Huon sea-level record of OIS 3 and implies that the eustatic sea level responded to the millennial-scale climate changes even during the glacial period of OIS 4.

Original languageEnglish
Pages (from-to)51-64
Number of pages14
JournalQuaternary International
Volume120
Issue number1
DOIs
Publication statusPublished - 2004

ASJC Scopus subject areas

  • Earth-Surface Processes

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