Bundled turbidite deposition in the central Pandora Trough (Gulf of Papua) since Last Glacial Maximum: Linking sediment nature and accumulation to sea level fluctuations at millennial timescale

Stéphan J. Jorry, André W. Droxler, Gianni Mallarino, Gerald R. Dickens, Sam J. Bentley, Luc Beaufort, Larry C Peterson, Bradley N. Opdyke

Research output: Contribution to journalArticle

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Abstract

Since Last Glacial Maximum (23-19 ka), Earth climate warming and deglaciation occurred in two major steps (Bølling-Allerød and Preboreal), interrupted by a short cooling interval referred to as the Younger Dryas (12.5-11.5 ka B.P.). In this study, three cores (MV-33, MV-66, and MD-40) collected in the central part of Pandora Trough (Gulf of Papua) have been analyzed, and they reveal a detailed sedimentary pattern at millennial timescale. Siliciclastic turbidites disappeared during the Bølling-Allerød and Preboreal intervals to systematically reoccur during the Younger Dryas interval. Subsequent to the final disappearance of the siliciclastic turbidites a calciturbidite occurred during meltwater pulse IB. The Holocene interval was characterized by a lack of siliciclastic turbidites, relatively high carbonate content, and fine bank-derived aragonitic sediment. The observed millennial timescale sedimentary variability can be explained by sea level fluctuations. During the Last Glacial Maximum, siliciclastic turbidites were numerous when the lowstand coastal system was located along the modem shelf edge. Although they did not occur during the intervals of maximum flooding of the shelf (during meltwater pulses 1A and 1B), siliciclastic turbidites reappear briefly during the Younger Dryas, an interval when sea level rise slowed, stopped, or perhaps even fell. The timing of the calciturbidite coincides with the first reflooding of Eastern Fields Reef, an atoll that remained exposed for most of the glacial stages.

Original languageEnglish (US)
Article numberF01S19
JournalJournal of Geophysical Research C: Oceans
Volume113
Issue number1
DOIs
StatePublished - Mar 24 2008

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Pandora
gulfs
Sea level
Younger Dryas
turbidite
sea level
troughs
Last Glacial Maximum
Preboreal
Sediments
sediments
trough
timescale
intervals
meltwater
Reefs
Carbonates
Modems
sediment
atoll

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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Bundled turbidite deposition in the central Pandora Trough (Gulf of Papua) since Last Glacial Maximum : Linking sediment nature and accumulation to sea level fluctuations at millennial timescale. / Jorry, Stéphan J.; Droxler, André W.; Mallarino, Gianni; Dickens, Gerald R.; Bentley, Sam J.; Beaufort, Luc; Peterson, Larry C; Opdyke, Bradley N.

In: Journal of Geophysical Research C: Oceans, Vol. 113, No. 1, F01S19, 24.03.2008.

Research output: Contribution to journalArticle

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