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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

Identifieur interne : 008874 ( Main/Exploration ); précédent : 008873; suivant : 008875

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

Auteurs : Stéphan J. Jorry [États-Unis, France] ; André W. Droxler [États-Unis] ; Gianni Mallarino [Pays-Bas] ; Gerald R. Dickens [États-Unis] ; Sam J. Bentley [Canada] ; Luc Beaufort [France] ; Larry C. Peterson [États-Unis] ; Bradley N. Opdyke [Australie]

Source :

RBID : ISTEX:14632C6CA6231269A14C4B1D6503996D63D1F1FC

Descripteurs français

English descriptors

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 1B. 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 modern 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.

Url:
DOI: 10.1029/2006JF000649


Affiliations:


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<term>Atoll chain</term>
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<term>Personal communication</term>
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<term>Quaternary</term>
<term>Radiocarbon</term>
<term>Radiocarbon dates</term>
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<term>Sacculifer</term>
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<term>Sedimentary</term>
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<term>Seismic stratigraphy</term>
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<term>Siliciclastic</term>
<term>Siliciclastic gravity flows</term>
<term>Siliciclastic turbidites</term>
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<term>Timing</term>
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<term>Turbidite</term>
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<term>Papouasie</term>
<term>Planète Terre</term>
<term>Préboréal</term>
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<term>Roche silicoclastique</term>
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<term>Carbonate content</term>
<term>Carbonate platforms</term>
<term>Carbonate sediments</term>
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<term>Coarse fraction</term>
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<term>Modern shelf edge</term>
<term>Muddy turbidites</term>
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<term>Neritic carbonate production</term>
<term>Oldest dryas</term>
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<term>Pandora trough</term>
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<term>Pelagic interval</term>
<term>Pelagic intervals</term>
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<term>Personal communication</term>
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<term>Portlock</term>
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<term>Radiocarbon</term>
<term>Radiocarbon dates</term>
<term>Rice university</term>
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<term>Sacculifer</term>
<term>Second step</term>
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<term>Sedimentary</term>
<term>Seismic</term>
<term>Seismic stratigraphy</term>
<term>Shelf edge</term>
<term>Siliciclastic</term>
<term>Siliciclastic gravity flows</term>
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<term>Tulsa</term>
<term>Turbidite</term>
<term>Turbidite deposition</term>
<term>Turbidites</term>
<term>Unpublished manuscript</term>
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<term>Younger dryas</term>
<term>Younger dryas event</term>
<term>Younger dryas interval</term>
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<front>
<div type="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 1B. 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 modern 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.</div>
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Data generation: Tue Dec 5 10:43:12 2017. Site generation: Tue Mar 5 14:07:20 2024