Assessing subsidence rates and paleo water-depths for Tahiti reefs using U-Th chronology of altered corals

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doi: 10.1016/j.margeo.2011.12.006
Author(s): Thomas, Alexander L.; Fujita, Kazuhiko; Iryu, Yasufumi; Bard, Edouard; Cabioch, Guy; Camoin, Gilbert; Cole, Julia E.; Deschamps, Pierre; Durand, Nicolas; Hamelin, Bruno; Heindel, Katrin; Henderson, Gideon M.; Mason, Andew J.; Matsuda, Hiroki; Ménabréaz, Lucie; Omori, Akitoshi; Quinn, Terry; Sakai, Saburo; Sato, Tokiyuki; Sugihara, Kaoru; Takahashi, Yasunari; Thouveny, Nicolas; Tudhope, Alexander W.; Webster, Jody; Westphal, Hildegard; Yokoyama, Yusuke
Author Affiliation(s): Primary:
Oxford University, Department of Earth Sciences, Oxford, United Kingdom
Other:
University of the Ryukyus, Japan
Tohoku University, Japan
Aix-Marseille Unmiversité, France
Institut de Recherche pour le Développement, New Caledonia
University of Arizona, United States
University of Bremen, Germany
Kumamoto University, Japan
Shizuoka University, Japan
University of South Florida, United States
Japan Agency for Marine-Earth Science and Technology, Japan
Akita University, Japan
Fukuoka University, Japan
University of Edinburgh, United Kingdom
James Cook University of North Queensland, Australia
Volume Title: Marine Geology
Source: Marine Geology, Vol.295-298, p.86-94. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. 63 refs.; illus., incl. 2 tables
Summary: We present uranium-thorium chronology for a 102m core through a Pleistocene reef at Tahiti (French Polynesia) sampled during IODP Expedition 310 "Tahiti Sea Level". We employ total and partial dissolution procedures on the older coral samples to investigate the diagenetic overprint of the uranium-thorium system. Although alteration of the U-Th system cannot be robustly corrected, diagenetic trends in the U-Th data, combined with sea level and subsidence constraints for the growth of the corals enables the age of critical samples to be constrained to marine isotope stage 9. We use the ages of the corals, together with δ18O based sea-level histories, to provide maximum constraints on possible paleo water-depths. These depth constraints are then compared to independent depth estimates based on algal and foraminiferal assemblages, microbioerosion patterns, and sedimentary facies, confirming the accuracy of these paleo water-depth estimates. We also use the fact that corals could not have grown above sea level to place a maximum constraint on the subsidence rate of Tahiti to be 0.39mka-1, with the most likely rate being close to the existing minimum estimate of 0.25mka-1. Abstract Copyright (2012) Elsevier, B.V.
Year of Publication: 2012
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 03 Geochronology; 24 Surficial Geology, Quaternary Geology; Absolute age; Carbonate rocks; Cenozoic; Cores; Dates; East Pacific; Expedition 310; French Polynesia; IODP Site M0005; Integrated Ocean Drilling Program; Oceania; Pacific Ocean; Paleobathymetry; Pleistocene; Polynesia; Quaternary; Rates; Reconstruction; Reefs; Sedimentary rocks; Society Islands; South Pacific; Southeast Pacific; Subsidence; Tahiti; Tahiti Sea Level Expedition; Th/U
Coordinates: S174600 S174600 W1493300 W1493300
Record ID: 2012045491
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands