Isotope analysis, age calculation and calcite concentration from IODP Hole 310-M0005D

  • A. Thomas (Contributor)
  • K. Fujita (Contributor)
  • Yasufumi Iryu (Contributor)
  • Edouard Bard (Contributor)
  • G. Cabioch (Contributor)
  • Gilbert F. Camoin (Contributor)
  • Julia E. Cole (Contributor)
  • P. Deschamps (Contributor)
  • Nicolas Durand (Contributor)
  • Bruno Hamelin (Contributor)
  • Katrin Heindel (Contributor)
  • G. M. Henderson (Contributor)
  • Andrew J. Mason (Contributor)
  • H. Matsuda (Contributor)
  • Lucie Ménabréaz (Contributor)
  • Akitoshi Omori (Contributor)
  • T. M. Quinn (Contributor)
  • Saburo Sakai (Contributor)
  • Tokiyuki Sato (Contributor)
  • K. Sugihara (Contributor)
  • Yasunari Takahashi (Contributor)
  • Nicolas Thouveny (Contributor)
  • Alexander W. Tudhope (Contributor)
  • Jody Webster (Contributor)
  • H. Westphal (Contributor)
  • Y. Yokoyama (Contributor)



We present uranium-thoriumchronology for a 102 mcore 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-thoriumsystem. 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 d18O 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 amaximumconstraint on the subsidence rate of Tahiti to be 0.39 m ka**-1,with the most likely rate being close to the existing minimum estimate of 0.25m ka**-1.
Date made availableJan 25 2024
Geographical coverageLOCATION: Tahiti, offshore Maraa
Geospatial Polygon-17.766520000000003, -149.55079, -17.766520000000003, -149.55079
  • Assessing subsidence rates and paleo water-depths for Tahiti reefs using U-Th chronology of altered corals

    Thomas, A. L., Fujita, K., Iryu, Y., Bard, E., Cabioch, G., Camoin, G., Cole, J. E., Deschamps, P., Durand, N., Hamelin, B., Heindel, K., Henderson, G. M., Mason, A. J., Matsuda, H., Ménabréaz, L., Omori, A., Quinn, T., Sakai, S., Sato, T., Sugihara, K., & 6 othersTakahashi, Y., Thouveny, N., Tudhope, A. W., Webster, J., Westphal, H. & Yokoyama, Y., Feb 15 2012, In: Marine Geology. 295-298, p. 86-94 9 p.

    Research output: Contribution to journalArticlepeer-review

    Open Access
    30 Scopus citations

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