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 : 000392 ( Istex/Curation ); précédent : 000391; suivant : 000393Bundled 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 :
- Journal of Geophysical Research: Earth Surface [ 0148-0227 ] ; 2008-03.
English descriptors
- KwdEn :
- Ashmore, Ashmore trough, Assoc, Atmospheric science, Atoll, Atoll chain, Bank tops, Beaufort, Calciturbidite, Carbonate, Carbonate content, Carbonate platforms, Carbonate sediments, Central pandora trough, Central part, Coarse fraction, Deglaciation, Deposition, Droxler, Dryas, Earth planet, Eastern fields, Eastern fields atoll, Fairbanks, Fine aragonite, First step, Flat floor, Fluctuation, Foraminifer, Geol, Glacial, Globigerinoides, Globigerinoides sacculifer, Holocene, Isotope, Jorry, Last deglaciation, Last transition, Late holocene, Late quaternary, Level change, Level fall, Level fluctuations, Level rise, Lightness, Marion dufresne, Meltwater, Meltwater pulse, Meltwater pulses, Millennial, Millennial timescale, Modern atolls, Modern shelf edge, Muddy turbidites, Neritic, Neritic carbonate production, Oldest dryas, Opdyke, Pandora, Pandora trough, Pandora troughs, Papua, Pecten cruise, Pelagic, Pelagic carbonates, Pelagic interval, Pelagic intervals, Pelagic sediment, Personal communication, Planktic, Planktic foraminifers, Portlock, Quaternary, Radiocarbon, Radiocarbon dates, Rice university, Ruber, Sacculifer, Second step, Sediment, Sedimentary, Seismic, Seismic stratigraphy, Shelf edge, Siliciclastic, Siliciclastic gravity flows, Siliciclastic turbidites, Stratigraphy, Timescale, Trough, Tulsa, Turbidite, Turbidite deposition, Turbidites, Unpublished manuscript, Upper part, Younger dryas, Younger dryas event, Younger dryas interval.
- Teeft :
- Ashmore, Ashmore trough, Assoc, Atmospheric science, Atoll, Atoll chain, Bank tops, Beaufort, Calciturbidite, Carbonate, Carbonate content, Carbonate platforms, Carbonate sediments, Central pandora trough, Central part, Coarse fraction, Deglaciation, Deposition, Droxler, Dryas, Earth planet, Eastern fields, Eastern fields atoll, Fairbanks, Fine aragonite, First step, Flat floor, Fluctuation, Foraminifer, Geol, Glacial, Globigerinoides, Globigerinoides sacculifer, Holocene, Isotope, Jorry, Last deglaciation, Last transition, Late holocene, Late quaternary, Level change, Level fall, Level fluctuations, Level rise, Lightness, Marion dufresne, Meltwater, Meltwater pulse, Meltwater pulses, Millennial, Millennial timescale, Modern atolls, Modern shelf edge, Muddy turbidites, Neritic, Neritic carbonate production, Oldest dryas, Opdyke, Pandora, Pandora trough, Pandora troughs, Papua, Pecten cruise, Pelagic, Pelagic carbonates, Pelagic interval, Pelagic intervals, Pelagic sediment, Personal communication, Planktic, Planktic foraminifers, Portlock, Quaternary, Radiocarbon, Radiocarbon dates, Rice university, Ruber, Sacculifer, Second step, Sediment, Sedimentary, Seismic, Seismic stratigraphy, Shelf edge, Siliciclastic, Siliciclastic gravity flows, Siliciclastic turbidites, Stratigraphy, Timescale, Trough, Tulsa, Turbidite, Turbidite deposition, Turbidites, Unpublished manuscript, Upper part, Younger dryas, Younger dryas event, Younger dryas interval.
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
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ashmore</term>
<term>Ashmore trough</term>
<term>Assoc</term>
<term>Atmospheric science</term>
<term>Atoll</term>
<term>Atoll chain</term>
<term>Bank tops</term>
<term>Beaufort</term>
<term>Calciturbidite</term>
<term>Carbonate</term>
<term>Carbonate content</term>
<term>Carbonate platforms</term>
<term>Carbonate sediments</term>
<term>Central pandora trough</term>
<term>Central part</term>
<term>Coarse fraction</term>
<term>Deglaciation</term>
<term>Deposition</term>
<term>Droxler</term>
<term>Dryas</term>
<term>Earth planet</term>
<term>Eastern fields</term>
<term>Eastern fields atoll</term>
<term>Fairbanks</term>
<term>Fine aragonite</term>
<term>First step</term>
<term>Flat floor</term>
<term>Fluctuation</term>
<term>Foraminifer</term>
<term>Geol</term>
<term>Glacial</term>
<term>Globigerinoides</term>
<term>Globigerinoides sacculifer</term>
<term>Holocene</term>
<term>Isotope</term>
<term>Jorry</term>
<term>Last deglaciation</term>
<term>Last transition</term>
<term>Late holocene</term>
<term>Late quaternary</term>
<term>Level change</term>
<term>Level fall</term>
<term>Level fluctuations</term>
<term>Level rise</term>
<term>Lightness</term>
<term>Marion dufresne</term>
<term>Meltwater</term>
<term>Meltwater pulse</term>
<term>Meltwater pulses</term>
<term>Millennial</term>
<term>Millennial timescale</term>
<term>Modern atolls</term>
<term>Modern shelf edge</term>
<term>Muddy turbidites</term>
<term>Neritic</term>
<term>Neritic carbonate production</term>
<term>Oldest dryas</term>
<term>Opdyke</term>
<term>Pandora</term>
<term>Pandora trough</term>
<term>Pandora troughs</term>
<term>Papua</term>
<term>Pecten cruise</term>
<term>Pelagic</term>
<term>Pelagic carbonates</term>
<term>Pelagic interval</term>
<term>Pelagic intervals</term>
<term>Pelagic sediment</term>
<term>Personal communication</term>
<term>Planktic</term>
<term>Planktic foraminifers</term>
<term>Portlock</term>
<term>Quaternary</term>
<term>Radiocarbon</term>
<term>Radiocarbon dates</term>
<term>Rice university</term>
<term>Ruber</term>
<term>Sacculifer</term>
<term>Second step</term>
<term>Sediment</term>
<term>Sedimentary</term>
<term>Seismic</term>
<term>Seismic stratigraphy</term>
<term>Shelf edge</term>
<term>Siliciclastic</term>
<term>Siliciclastic gravity flows</term>
<term>Siliciclastic turbidites</term>
<term>Stratigraphy</term>
<term>Timescale</term>
<term>Trough</term>
<term>Tulsa</term>
<term>Turbidite</term>
<term>Turbidite deposition</term>
<term>Turbidites</term>
<term>Unpublished manuscript</term>
<term>Upper part</term>
<term>Younger dryas</term>
<term>Younger dryas event</term>
<term>Younger dryas interval</term>
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<keywords scheme="Teeft" xml:lang="en"><term>Ashmore</term>
<term>Ashmore trough</term>
<term>Assoc</term>
<term>Atmospheric science</term>
<term>Atoll</term>
<term>Atoll chain</term>
<term>Bank tops</term>
<term>Beaufort</term>
<term>Calciturbidite</term>
<term>Carbonate</term>
<term>Carbonate content</term>
<term>Carbonate platforms</term>
<term>Carbonate sediments</term>
<term>Central pandora trough</term>
<term>Central part</term>
<term>Coarse fraction</term>
<term>Deglaciation</term>
<term>Deposition</term>
<term>Droxler</term>
<term>Dryas</term>
<term>Earth planet</term>
<term>Eastern fields</term>
<term>Eastern fields atoll</term>
<term>Fairbanks</term>
<term>Fine aragonite</term>
<term>First step</term>
<term>Flat floor</term>
<term>Fluctuation</term>
<term>Foraminifer</term>
<term>Geol</term>
<term>Glacial</term>
<term>Globigerinoides</term>
<term>Globigerinoides sacculifer</term>
<term>Holocene</term>
<term>Isotope</term>
<term>Jorry</term>
<term>Last deglaciation</term>
<term>Last transition</term>
<term>Late holocene</term>
<term>Late quaternary</term>
<term>Level change</term>
<term>Level fall</term>
<term>Level fluctuations</term>
<term>Level rise</term>
<term>Lightness</term>
<term>Marion dufresne</term>
<term>Meltwater</term>
<term>Meltwater pulse</term>
<term>Meltwater pulses</term>
<term>Millennial</term>
<term>Millennial timescale</term>
<term>Modern atolls</term>
<term>Modern shelf edge</term>
<term>Muddy turbidites</term>
<term>Neritic</term>
<term>Neritic carbonate production</term>
<term>Oldest dryas</term>
<term>Opdyke</term>
<term>Pandora</term>
<term>Pandora trough</term>
<term>Pandora troughs</term>
<term>Papua</term>
<term>Pecten cruise</term>
<term>Pelagic</term>
<term>Pelagic carbonates</term>
<term>Pelagic interval</term>
<term>Pelagic intervals</term>
<term>Pelagic sediment</term>
<term>Personal communication</term>
<term>Planktic</term>
<term>Planktic foraminifers</term>
<term>Portlock</term>
<term>Quaternary</term>
<term>Radiocarbon</term>
<term>Radiocarbon dates</term>
<term>Rice university</term>
<term>Ruber</term>
<term>Sacculifer</term>
<term>Second step</term>
<term>Sediment</term>
<term>Sedimentary</term>
<term>Seismic</term>
<term>Seismic stratigraphy</term>
<term>Shelf edge</term>
<term>Siliciclastic</term>
<term>Siliciclastic gravity flows</term>
<term>Siliciclastic turbidites</term>
<term>Stratigraphy</term>
<term>Timescale</term>
<term>Trough</term>
<term>Tulsa</term>
<term>Turbidite</term>
<term>Turbidite deposition</term>
<term>Turbidites</term>
<term>Unpublished manuscript</term>
<term>Upper part</term>
<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>
</front>
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