Reef response to sea-level and environmental changes during the last deglaciation; Integrated Ocean Drilling Program Expedition 310, Tahiti Sea Level

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doi: 10.1130/G32057.1
Author(s): Camoin, Gilbert F.; Seard, Claire; Deschamps, Pierre; Webster, Jody M.; Abbey, Elizabeth; Braga, Juan C.; Iryu, Yasufumi; Durand, Nicolas; Bard, Edouard; Hamelin, Bruno; Yokoyama, Yusuke; Thomas, Alexander L.; Henderson, Gideon M.; Dussouillez, Philippe
Author Affiliation(s): Primary:
Université Paul Cézanne-Collège de France, Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, Aix-en-Provence, France
University of Sydney, Australia
Universidad de Granada, Spain
Nagoya University, Japan
University of Tokyo, Japan
University of Oxford, United Kingdom
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 40(7), p.643-646. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. Accessed on July 26, 2012. 24 refs.; illus., incl. sects., sketch map
Summary: The last deglaciation is characterized by a rapid sea-level rise and coeval abrupt environmental changes. The Barbados coral reef record suggests that this period has been punctuated by two brief intervals of accelerated melting (meltwater pulses, MWP), occurring at 14.08-13.61 ka and 11.4-11.1 ka (calendar years before present), that are superimposed on a smooth and continuous rise of sea level. Although their timing, magnitude, and even existence have been debated, those catastrophic sea-level rises are thought to have induced distinct reef drowning events. The reef response to sea-level and environmental changes during the last deglacial sea-level rise at Tahiti is reconstructed based on a chronological, sedimentological, and paleobiological study of cores drilled through the relict reef features on the modern forereef slopes during the Integrated Ocean Drilling Program Expedition 310, complemented by results on previous cores drilled through the Papeete reef. Reefs accreted continuously between 16 and 10 ka, mostly through aggradational processes, at growth rates averaging 10 mm yr-1. No cessation of reef growth, even temporary, has been evidenced during this period at Tahiti. Changes in the composition of coralgal assemblages coincide with abrupt variations in reef growth rates and characterize the response of the upward-growing reef pile to nonmonotonous sea-level rise and coeval environmental changes. The sea-level jump during MWP 1A, 16 ± 2 m of magnitude in ∼350 yr, induced the retrogradation of shallow-water coral assemblages, gradual deepening, and incipient reef drowning. The Tahiti reef record does not support the occurrence of an abrupt reef drowning event coinciding with a sea-level pulse of ∼15 m, and implies an apparent rise of 40 mm yr-1 during the time interval corresponding to MWP 1B at Barbados.
Year of Publication: 2012
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Anthozoa; Assemblages; Cenozoic; Cnidaria; Cores; Deglaciation; East Pacific; Expedition 310; Growth rates; Integrated Ocean Drilling Program; Invertebrata; Marine sediments; Pacific Ocean; Pleistocene; Quaternary; Reconstruction; Reefs; Sea-level changes; Sediments; South Pacific; Southeast Pacific; Tahiti Sea Level Expedition; Upper Pleistocene
Coordinates: S174600 S172900 W1492400 W1493600
Record ID: 2012073121
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