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Sea-level and reef accretion history of Marine Oxygen Isotope Stage 7 and late Stage 5 based on age and facies of submerged late Pleistocene reefs, Oahu, Hawaii

Published online by Cambridge University Press:  20 January 2017

Clark E. Sherman ,
Charles H. Fletcher ,
Ken H. Rubin ,
Kathleen R. Simmons  and
Walter H. Adey
Clark E. Sherman*
Affiliation:
Department of Marine Sciences, University of Puerto Rico-Mayagüez, Mayagüez, PR 00681, USA
Charles H. Fletcher
Affiliation:
Department of Geology and Geophysics, SOEST, University of Hawaii at Manoa, Honolulu, HI 96822, USA
Ken H. Rubin
Affiliation:
Department of Geology and Geophysics, SOEST, University of Hawaii at Manoa, Honolulu, HI 96822, USA
Kathleen R. Simmons
Affiliation:
U.S. Geological Survey, MS980, Federal Center, Denver, CO 80225, USA
Walter H. Adey
Affiliation:
Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
*
*Corresponding author. E-mail address:clark.sherman@upr.edu (C.E. Sherman).
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Abstract

In situ Pleistocene reefs form a gently sloping nearshore terrace around the island of Oahu. TIMS Th–U ages of in situ corals indicate that most of the terrace is composed of reefal limestones correlating to Marine Oxygen Isotope Stage 7 (MIS 7, ~ 190–245 ka). The position of the in situ MIS 7 reef complex indicates that it formed during periods when local sea level was ~ 9 to 20 m below present sea level. Its extensiveness and geomorphic prominence as well as a paucity of emergent in situ MIS 7 reef-framework deposits on Oahu suggest that much of MIS 7 was characterized by regional sea levels below present. Later accretion along the seaward front of the terrace occurred during the latter part of MIS 5 (i.e., MIS 5a–5d, ~ 76–113 ka). The position of the late MIS 5 reefal limestones is consistent with formation during a period when local sea level was below present. The extensiveness of the submerged Pleistocene reefs around Oahu compared to the relative dearth of Holocene accretion is due to the fact that Pleistocene reefs had both more time and more accommodation space available for accretion than their Holocene counterparts.

Keywords

HawaiiPleistocene reefTh–U datingReef faciesPleistocene sea level
Type
Research Article
Information
Quaternary Research , Volume 81 , Issue 1 , January 2014 , pp. 138 - 150
Copyright
University of Washington

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