Comparison of 14C and U-Th ages in corals from IODP #310 cores offshore Tahiti

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doi: 10.2458/azu_js_rc.v55i2.16134
Author(s): Durand, Nicolas; Deschamps, Pierre; Bard, Edouard; Hamelin, Bruno; Camoin, Gilbert; Thomas, Alexander L.; Handerson, Gideon M.; Yokoyama, Yusuke; Matsuzaki, Hiroyuki
Author Affiliation(s): Primary:
Aix-Marseille University, Aix-en-Provence, France
Oxford University, United Kingdom
University of Tokyo, Japan
Volume Title: IntCal13
Volume Author(s): Reimer, Paula J., editor
Source: IntCal13, edited by Paula J. Reimer. Radiocarbon, 55(4), p.1947-1974. Publisher: University of Arizona, Tucson, AZ, United States. ISSN: 0033-8222 CODEN: RACAAT
Note: In English. 22 refs.; illus., incl. sketch map
Summary: Shallow-water tropical corals can be us ed to calibrate the radiocarbon timescale. In this paper, we present a new data set based on the comparison between 14 C ages and U-Th ages measured in foss il corals collected offshore the island of Tahiti during the Integrated Oceanic Drilling Program (IODP) Expedition 310. After applying strict mineralogical and geochemical screening criteria, the Tahiti record provides new data for 2 distinct time windows: 7 data for the interval between 29 and 37 cal kyr BP and 58 for the last deglaciation period, notably a higher resolution for the 14-16 cal kyr BP time interval. There are 3 main outcomes of this study. First, it ex tends the previous Tahiti record beyond 13.9 cal kyr BP, the old est U-Th age obtained on cores drilled onshore in the modern Tahiti barrier reef. Second, it strengthens the data set of the 14-15 cal kyr BP period, allowing for better documentation of the 14 C age plateau in this time range. This age plateau corresponds to a drop of the atmospheric 14 C synchronous with an abrupt period of sealevel rise (Melt Water Pulse 1A, MWP-1A). The Tahiti 14 C record documents complex changes in the global carbon cycle due to variations in the exchange rates between its different reservoirs. Third, during the Heinrich event 1, the Tahiti record disagrees with the Cariaco record, but is in broad agreement with other marine and continental data
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 03 Geochronology; Absolute age; Anthozoa; C-14; Carbon; Cenozoic; Cnidaria; Dates; East Pacific; Expedition 310; French Polynesia; Integrated Ocean Drilling Program; Invertebrata; Isotopes; Methods; Oceania; Pacific Ocean; Polynesia; Quaternary; Radioactive isotopes; Society Islands; South Pacific; Southeast Pacific; Tahiti; Tahiti Sea Level Expedition; Th/U
Coordinates: S180000 S170000 W1490000 W1500000
Record ID: 2015070453
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