We present uranium–thorium chronology for a 102 m 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 0.39 m ka− 1, with the most likely rate being close to the existing minimum estimate of 0.25 m ka− 1.
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., Takahashi Y., Thouveny N., Tudhope A.W., Webster J., Westphal H. and Yokoyama Y. (2012) Assessing subsidence rates and paleo water-depths for Tahiti reefs using U–Th chronology of altered corals. 295-298: 86-94. 10.1016/j.margeo.2011.12.006
@article{Thomas2012,
Title = {Assessing subsidence rates and paleo water-depths for Tahiti reefs using U–Th chronology of altered corals},
Author = {Thomas, Alexander L. and Fujita, Kazuhiko and Iryu, Yasufumi and Bard, Edouard and Cabioch, Guy and Camoin, Gilbert and Cole, Julia E. and Deschamps, Pierre and Durand, Nicolas and Hamelin, Bruno and Heindel, Katrin and Henderson, Gideon M. and Mason, Andrew J. and Matsuda, Hiroki and Ménabréaz, Lucie and Omori, Akitoshi and Quinn, Terry and Sakai, Saburo and Sato, Tokiyuki and Sugihara, Kaoru and Takahashi, Yasunari and Thouveny, Nicolas and Tudhope, Alexander W. and Webster, Jody and Westphal, Hildegard and Yokoyama, Yusuke},
Editor = {},
Year = {2012},
Pages = {86-94},
Volume = {295-298},
Doi = {10.1016/j.margeo.2011.12.006},
Abstract = {We present uranium–thorium chronology for a 102 m 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 0.39 m ka− 1, with the most likely rate being close to the existing minimum estimate of 0.25 m ka− 1.},
}
TY - JOUR
AU - Thomas, Alexander L.
AU - Fujita, Kazuhiko
AU - Iryu, Yasufumi
AU - Bard, Edouard
AU - Cabioch, Guy
AU - Camoin, Gilbert
AU - Cole, Julia E.
AU - Deschamps, Pierre
AU - Durand, Nicolas
AU - Hamelin, Bruno
AU - Heindel, Katrin
AU - Henderson, Gideon M.
AU - Mason, Andrew J.
AU - Matsuda, Hiroki
AU - Ménabréaz, Lucie
AU - Omori, Akitoshi
AU - Quinn, Terry
AU - Sakai, Saburo
AU - Sato, Tokiyuki
AU - Sugihara, Kaoru
AU - Takahashi, Yasunari
AU - Thouveny, Nicolas
AU - Tudhope, Alexander W.
AU - Webster, Jody
AU - Westphal, Hildegard
AU - Yokoyama, Yusuke
TI - Assessing subsidence rates and paleo water-depths for Tahiti reefs using U–Th chronology of altered corals
PY - 2012
SP - 86-94
VL - 295-298
DO - 10.1016/j.margeo.2011.12.006
AB - We present uranium–thorium chronology for a 102 m 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 0.39 m ka− 1, with the most likely rate being close to the existing minimum estimate of 0.25 m ka− 1.
ER -
