Abstract
We investigated sediment and organic-carbon accumulation rates in two jumbo piston cores (MV-54, MV-51) retrieved from the midslope of the northeastern Pandora Trough in the Gulf of Papua, Papua New Guinea. Our data provide a first assessment of mass fluxes over the past ∼33,000 14C years B.P. and variations in organic-carbon sources. Core sediments were analyzed using a suite of physical properties, organic geochemistry, and micropaleontological measurements. MV-54 and MV-51 show two periods of rapid sediment accumulation. The first interval is from ∼15,000 to 20,400 Cal. years B.P. (MV-51: ∼1.09 in ka-1 and ∼81.2 g cm-2 ka-1) and the second occurs at >32,000 14C years B.P. (∼2.70 in ka-1 and ∼244 g cm-2 ka-1). Extremely high accumulation rates (∼3.96 in ka-1; ∼428 g cm-2 ka-1) characterize 15,800-17,700 Cal. years B.P. in MV-54 and likely correspond to early transgression when rivers delivered sediments much closer to the shelf edge. A benthic foraminiferal assemblage in NW-51 from ∼18,400 to 20,400 Cal. years B.P. indicates a seasonally variable flux of organic carbon, possibly resulting from enhanced contrast between monsoon seasons. The oldest sediments, >32,000 14C years B.P., contain TOC fluxes >200 g cm2 ka-1, with >50% of it derived from C3 vascular plant matter. Magnetic susceptibility values are 2 to 3 times higher and benthic foraminiferal accumulation rates are 6 times higher during this interval than at any younger time, indicating a greater influence of detrital minerals and labile organic carbon. The MS data suggest more direct dispersal pathways from central and eastern PNG Rivers to the core site.
| Original language | English (US) |
|---|---|
| Article number | F01S18 |
| Journal | Journal of Geophysical Research C: Oceans |
| Volume | 113 |
| Issue number | 1 |
| DOIs | |
| State | Published - Mar 24 2008 |
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ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
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Late Pleistocene and Holocene sedimentation, organic-carbon delivery, and paleoclimatic inferences on the continental slope of the northern Pandora Trough, Gulf of Papua. / Febo, Lawrence A.; Bentley, Samuel J.; Wrenn, John H.; Droxler, André W.; Dickens, Gerald R.; Peterson, Larry C; Opdyke, Bradley N.
In: Journal of Geophysical Research C: Oceans, Vol. 113, No. 1, F01S18, 24.03.2008.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Late Pleistocene and Holocene sedimentation, organic-carbon delivery, and paleoclimatic inferences on the continental slope of the northern Pandora Trough, Gulf of Papua
AU - Febo, Lawrence A.
AU - Bentley, Samuel J.
AU - Wrenn, John H.
AU - Droxler, André W.
AU - Dickens, Gerald R.
AU - Peterson, Larry C
AU - Opdyke, Bradley N.
PY - 2008/3/24
Y1 - 2008/3/24
N2 - We investigated sediment and organic-carbon accumulation rates in two jumbo piston cores (MV-54, MV-51) retrieved from the midslope of the northeastern Pandora Trough in the Gulf of Papua, Papua New Guinea. Our data provide a first assessment of mass fluxes over the past ∼33,000 14C years B.P. and variations in organic-carbon sources. Core sediments were analyzed using a suite of physical properties, organic geochemistry, and micropaleontological measurements. MV-54 and MV-51 show two periods of rapid sediment accumulation. The first interval is from ∼15,000 to 20,400 Cal. years B.P. (MV-51: ∼1.09 in ka-1 and ∼81.2 g cm-2 ka-1) and the second occurs at >32,000 14C years B.P. (∼2.70 in ka-1 and ∼244 g cm-2 ka-1). Extremely high accumulation rates (∼3.96 in ka-1; ∼428 g cm-2 ka-1) characterize 15,800-17,700 Cal. years B.P. in MV-54 and likely correspond to early transgression when rivers delivered sediments much closer to the shelf edge. A benthic foraminiferal assemblage in NW-51 from ∼18,400 to 20,400 Cal. years B.P. indicates a seasonally variable flux of organic carbon, possibly resulting from enhanced contrast between monsoon seasons. The oldest sediments, >32,000 14C years B.P., contain TOC fluxes >200 g cm2 ka-1, with >50% of it derived from C3 vascular plant matter. Magnetic susceptibility values are 2 to 3 times higher and benthic foraminiferal accumulation rates are 6 times higher during this interval than at any younger time, indicating a greater influence of detrital minerals and labile organic carbon. The MS data suggest more direct dispersal pathways from central and eastern PNG Rivers to the core site.
AB - We investigated sediment and organic-carbon accumulation rates in two jumbo piston cores (MV-54, MV-51) retrieved from the midslope of the northeastern Pandora Trough in the Gulf of Papua, Papua New Guinea. Our data provide a first assessment of mass fluxes over the past ∼33,000 14C years B.P. and variations in organic-carbon sources. Core sediments were analyzed using a suite of physical properties, organic geochemistry, and micropaleontological measurements. MV-54 and MV-51 show two periods of rapid sediment accumulation. The first interval is from ∼15,000 to 20,400 Cal. years B.P. (MV-51: ∼1.09 in ka-1 and ∼81.2 g cm-2 ka-1) and the second occurs at >32,000 14C years B.P. (∼2.70 in ka-1 and ∼244 g cm-2 ka-1). Extremely high accumulation rates (∼3.96 in ka-1; ∼428 g cm-2 ka-1) characterize 15,800-17,700 Cal. years B.P. in MV-54 and likely correspond to early transgression when rivers delivered sediments much closer to the shelf edge. A benthic foraminiferal assemblage in NW-51 from ∼18,400 to 20,400 Cal. years B.P. indicates a seasonally variable flux of organic carbon, possibly resulting from enhanced contrast between monsoon seasons. The oldest sediments, >32,000 14C years B.P., contain TOC fluxes >200 g cm2 ka-1, with >50% of it derived from C3 vascular plant matter. Magnetic susceptibility values are 2 to 3 times higher and benthic foraminiferal accumulation rates are 6 times higher during this interval than at any younger time, indicating a greater influence of detrital minerals and labile organic carbon. The MS data suggest more direct dispersal pathways from central and eastern PNG Rivers to the core site.
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U2 - 10.1029/2006JF000677
DO - 10.1029/2006JF000677
M3 - Article
VL - 113
JO - Journal of Geophysical Research: Oceans
JF - Journal of Geophysical Research: Oceans
SN - 2169-9275
IS - 1
M1 - F01S18
ER -