Data Description

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Citation:
Mollenhauer, G et al. (2005): (Table 2) Radiocarbon contents of TOC and alkenone samples. doi:10.1594/PANGAEA.837739,
Supplement to: Mollenhauer, Gesine; Kienast, Markus; Lamy, Frank; Meggers, Helge; Schneider, Ralph R; Hayes, John M; Eglinton, Timothy I (2005): An evaluation of 14C age relationships between co-occurring foraminifera, alkenones, and total organic carbon in continental margin sediments. Paleoceanography, 20(1), PA1016, doi:10.1029/2004PA001103
Abstract:
Radiocarbon age relationships between co-occurring planktic foraminifera, alkenones, and total organic carbon in sediments from the continental margins of southern Chile, northwest Africa, and the South China Sea were compared with published results from the Namibian margin. Age relationships between the sediment components are site-specific and relatively constant over time. Similar to the Namibian slope, where alkenones have been reported to be 1000-4500 years older than co-occurring foraminifera, alkenones were significantly (~1000 years) older than co-occurring foraminifera in the Chilean margin sediments. In contrast, alkenones and foraminifera were of similar age (within 2 sigma error or better) in the NW African and South China Sea sediments. Total organic matter and alkenone ages were similar off Namibia (age difference TOC alkenones: 200-700 years), Chile (100-450 years), and NW Africa (360-770 years), suggesting minor contributions of preaged terrigenous material. In the South China Sea, total organic carbon is significantly (2000-3000 years) older owing to greater inputs of preaged terrigenous material. Age offsets between alkenones and planktic foraminifera are attributed to lateral advection of organic matter. Physical characteristics of the depositional setting, such as seafloor morphology, shelf width, and sediment composition, may control the age of co-occurring sediment components. In particular, offsets between alkenones and foraminifera appear to be greatest in deposition centers in morphologic depressions. Aging of organic matter is promoted by transport. Age offsets are correlated with organic richness, suggesting that formation of organic aggregates is a key process.
Related to:
Kienast, Markus; Steinke, Stephan; Stattegger, Karl; Calvert, Stephen E (2001): Age and alkenone-derived Holocene sea-surface temperature records of sediment core GIK18287-3. Department of Geosciences, Bremen University, doi:10.1594/PANGAEA.438398
Kienast, Markus; Steinke, Stephan; Stattegger, Karl; Calvert, Stephen E (2001): Synchronous tropical South China Sea SST change and Greenland warming during deglaciation. Science, 291(5511), 2132-2134, doi:10.1126/science.1057131 *
Kuhlmann, Holger; Meggers, Helge; Freudenthal, Tim; Wefer, Gerold (2004): Radiocarbon ages and calibrated ages of sediment core GeoB5546-2. doi:10.1594/PANGAEA.208150
Kuhlmann, Holger; Meggers, Helge; Freudenthal, Tim; Wefer, Gerold (2004): The transition of the monsoonal and the N Atlantic climate system off NW Africa during the Holocene. Geophysical Research Letters, 31, L22204, doi:10.1029/2004GL021267 *
Lamy, Frank; Hebbeln, Dierk; Röhl, Ursula; Wefer, Gerold (2001): (Table 1) Age model of sediment core GeoB3313-1. doi:10.1594/PANGAEA.58452
Lamy, Frank; Hebbeln, Dierk; Röhl, Ursula; Wefer, Gerold (2001): Holocene rainfall variability in southern Chile: a marine record of latitudinal shifts of the Southern Westerlies. Earth and Planetary Science Letters, 185(3-4), 369-382, doi:10.1016/S0012-821X(00)00381-2 *
Coverage:
Median Latitude: -2.600056 * Median Longitude: 7.492144 * South-bound Latitude: -41.000000 * West-bound Longitude: -74.450000 * North-bound Latitude: 27.536700 * East-bound Longitude: 110.663133
Date/Time Start: 1995-05-12T00:00:00 * Date/Time End: 1998-10-15T11:01:00
Minimum DEPTH, sediment/rock: 0.0150 m * Maximum DEPTH, sediment/rock: 7.5800 m
Event(s):
GIK18287-2 (SO115_40) * * Latitude: 5.663133 * Longitude: 110.663133 * Date/Time: 1996-12-13T00:00:00 * Elevation: -596.0 m * Recovery: 0.43 m * Location: Sunda Shelf * * Campaign: SO115 (SUNDAFLUT) * * Basis: Sonne * * Device: MultiCorer (MUC) * * Comment: MUC/clay, surface: smooth, fluff Saccorhiza ramosa
GeoB3313-1 * * Latitude: -41.000000 * Longitude: -74.450000 * Date/Time: 1995-05-12T00:00:00 * Elevation: -852.0 m * Recovery: 8.07 m * Location: South-East Pacific * * Campaign: SO102/1 (CHIPAL) * * Basis: Sonne * * Device: Gravity corer (Kiel type) (SL) *
GeoB5546-2 * * Latitude: 27.536700 * Longitude: -13.736700 * Date/Time: 1998-10-15T11:01:00 * Elevation: -1172.0 m * Recovery: 8.51 m * Campaign: M42/4b * * Basis: Meteor (1986) * * Device: Piston corer (BGR type) (KL) * * Comment: core recovery 8.51 m
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event label *Event
2DEPTH, sediment/rock *DepthmGeocode
3Depth, top/min *Depth topmMollenhauer, Gesine *
4Depth, bottom/max *Depth botmMollenhauer, Gesine *
5Fraction modern carbon *fMCMollenhauer, Gesine *foraminifera
6Fraction modern carbon, error *fMC eMollenhauer, Gesine *foraminifera
7Age, dated *Age datedkaMollenhauer, Gesine *foraminifera; ages without fMC measurements are from Kienast et al. (2001) (South China Sea),
Kuhlmann et al. (2004) (NW Africa), and Lamy et al. (2001) (Chile); ages without standard deviation are interpolated values
8Age, dated standard deviation *Age std dev±Mollenhauer, Gesine *foraminifera; ages without fMC measurements are from Kienast et al. (2001) (South China Sea),
Kuhlmann et al. (2004) (NW Africa), and Lamy et al. (2001) (Chile); ages without standard deviation are interpolated values
9Fraction modern carbon *fMCMollenhauer, Gesine *bulk organic carbon
10Fraction modern carbon, error *fMC eMollenhauer, Gesine *bulk organic carbon
11Age, dated *Age datedkaMollenhauer, Gesine *Age, 14C AMS *bulk organic carbon
12Age, dated standard deviation *Age std dev±Mollenhauer, Gesine *Age, 14C AMS *bulk organic carbon
13Fraction modern carbon *fMCMollenhauer, Gesine *alkenones
14Fraction modern carbon, error *fMC eMollenhauer, Gesine *alkenones
15Age, dated *Age datedkaMollenhauer, Gesine *Age, 14C AMS *alkenones
16Age, dated standard deviation *Age std dev±Mollenhauer, Gesine *Age, 14C AMS *alkenones
17Mass *MassµgMollenhauer, Gesine *sample
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254 data points

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