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Wagner, Thomas (1999): Analysis of macerals in sediment core 159-959C. PANGAEA,, Supplement to: Wagner, T (1999): Petrology of organic matter in modern and Late Quaternary deposits of the equatorial Atlantic. International Journal of Coal Geology, 39(1-3), 155-184,

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Organic petrologic and geochemical analyses were performed on modern and Quaternary organic carbon-poor deep sea sediments from the Equatorial Atlantic. The study area covers depositional settings from the West African margin (ODP Site 959) through the Equatorial Divergence (ODP Site 663) to the pelagic Equatorial Atlantic. Response of organic matter (OM) deposition to Quaternary climatic cycles is discussed for ODP Sites 959 and 663. The results are finally compared to a concept established for fossil deep sea environments [Littke and Sachsenhofer, 1994 doi:10.1021/ef00048a041]. Organic geochemical results obtained from Equatorial Atlantic deep sea deposits provide new aspects on the distribution of sedimentary OM in response to continental distance, atmospheric and oceanographic circulation, and depositional processes controlling sedimentation under modern and past glacial–interglacial conditions. The inventory of macerals in deep sea deposits is limited due to mechanical breakdown of particles, degree of oxidation, and selective remineralization of labile (mostly marine) OM. Nevertheless, organic petrology has a great potential for paleoenvironmental studies, especially as a proxy to assess quantitative information on the relative abundance of marine vs. terrigenous OM. Discrepancies between quantitative data obtained from microscopic and isotopic (delta13Corg) analyses were observed depending on the stratigraphic level and depositional setting. Strongest offset between both records was found close to the continent and during glacial periods, suggesting a coupling with wind-born terrigenous OM from central Africa. Since African dust source areas are covered by C4 grass plants, supply of isotopically heavy OM is assumed to have caused the difference between microscopic and isotopic records.
Latitude: 3.627700 * Longitude: -2.735280
Date/Time Start: 1995-01-13T03:15:00 * Date/Time End: 1995-01-14T00:00:00
Minimum Elevation: -2091.0 m * Maximum Elevation: -2091.0 m
159-959C * Latitude: 3.627700 * Longitude: -2.735280 * Date/Time Start: 1995-01-13T03:15:00 * Date/Time End: 1995-01-14T00:00:00 * Elevation: -2091.0 m * Penetration: 179.6 m * Recovery: 187.34 m * Location: Gulf of Guinea * Campaign: Leg159 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 20 cores; 179.6 m cored; 0 m drilled; 104.3 % recovery
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Sample code/labelSample labelWagner, ThomasDSDP/ODP/IODP sample designation
2AGEAgeka BPGeocode
3Carbon, organic, totalTOC%Wagner, ThomasElement analyser CHN, LECO
4Hydrogen index *HI *mg/gWagner, ThomasRock eval pyrolysis (Behar et al., 2001)
5LiptodetriniteLiptodetrinite%Wagner, ThomasFluorescent microscope
6AlginiteAlginite%Wagner, ThomasFluorescent microscope
7VitrodetriniteVitrodetrinite%Wagner, ThomasFluorescent microscope
8VitriniteVitr%Wagner, ThomasFluorescent microscope
9InertodetriniteInertodetrinite%Wagner, ThomasFluorescent microscope
10InertiniteInertinite%Wagner, ThomasFluorescent microscope
11Inertinite/Vitrinite ratioInertinite/VitriniteWagner, ThomasOrganic petrologyInertinite+ recyceled Vitrinite (75%)/Vitrinite
1001 data points

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