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Prahl, Frederick G; Muehlhausen, Laurel A; Lyle, Mitchell W (1989): Bulk geochemical and lipid biomarker data for sediment core W8402A-14 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.733908, Supplement to: Prahl, FG et al. (1989): An organic Geochemical Assessment of Oceanographic conditions at manop site C over the Past 26,000 Years. Paleoceanography, 4(5), 495-510, https://doi.org/10.1029/PA004i005p00495

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Abstract:
Eleven sediment samples taken downcore and representing the past 26 kyr of deposition at MANOP site C (0°57.2°N, 138°57.3°W) were analyzed for lipid biomarker composition. Biomarkers of both terrestrial and marine sources of organic carbon were identified. In general, concentration profiles for these biomarkers and for total organic carbon (TOC) displayed three common stratigraphic features in the time series: (1) a maximum within the surface sediment mixed layer (<=4 ka); (2) a broad minimum extending throughout the interglacial deposit; and (3) a deep, pronounced maximum within the glacial deposit. Using the biomarker records, a simple binary mixing model is described that assesses the proportion of terrestrial to marine TOC in these sediments. Best estimates from this model suggest that ~20% of the TOC is land-derived, introduced by long-range eolian transport, and the remainder is derived from marine productivity. The direct correlation between the records for terrestrial and marine TOC with depth in this core fits an interpretation that primary productivity at site C has been controlled by wind-driven upwelling at least over the last glacial/interglacial cycle. The biomarker records place the greatest wind strength and highest primary productivity within the time frame of 18 to 22 kyr B.P. Diagenetic effects limit our ability to ascertain directly from the biomarker records the absolute magnitude that different types of primary productivity have changed at this ocean location over the past 26 kyr.
Coverage:
Latitude: 0.953000 * Longitude: -138.955000
Date/Time Start: 1984-02-23T00:00:00 * Date/Time End: 1984-02-23T00:00:00
Minimum DEPTH, sediment/rock: 0.015 m * Maximum DEPTH, sediment/rock: 0.445 m
Event(s):
W8402A-14 * Latitude: 0.953000 * Longitude: -138.955000 * Date/Time: 1984-02-23T00:00:00 * Elevation: -4287.0 m * Recovery: 3.3 m * Campaign: W8402A * Basis: Wecoma * Method/Device: Gravity corer (GC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepth sedmGeocode
2AGEAgeka BPGeocode
3Calcium carbonateCaCO3%Prahl, Frederick G
4Carbon, organic, totalTOC%Prahl, Frederick G
5Total terrestrial fatty acids (nC20-30)ttfanC20-30Prahl, Frederick GGas chromatography
6--Prahl, Frederick Gratio of solvent extractable (free) to acid hydrolyzed (bound) terrestrial n-acids
7Carbon Preference IndexCPIPrahl, Frederick Gfree, for free and bounded terrestrial n-acid series (C20-C30)
8Carbon Preference IndexCPIPrahl, Frederick Gbound, for free and bounded terrestrial n-acid series (C20-C30)
9Alkenone per unit sediment massAlkenone/sedµg/gPrahl, Frederick GGas chromatography
10Alkenone, unsaturation index UK37UK37Prahl, Frederick GCalculated from C37 alkenones (Brassell et al., 1986)
11Sea surface temperature, annual meanSST (1-12)°CPrahl, Frederick GCalculated from UK'37 (Prahl et al., 1988)
Size:
99 data points

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