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Zonneveld, Karin A F (2004): Stable oxygen isotope data of Thoracosphaera heimii in surface sediment samples of the equatorial Atlantic and South Atlantic. PANGAEA,, Supplement to: Zonneveld, KAF (2004): Potential use of stable oxygen isotope composition of Thoracasphaera heimii for upper water column (thermocline) temperature reconstruction. Marine Micropaleontology, 50(3-4), 307-317,

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To investigate the potential use of the stable isotope composition of the vegetative cysts of the photosynthetic dinoflagellate Thoracosphaera heimii for quantitative palaeotemperature reconstructions a method has been developed to purify T. heimii cysts from sediment samples. Stable oxygen and carbon isotopes have been measured on T. heimii cysts from 21 surface sediment samples from the equatorial Atlantic and South Atlantic Oceans. Calculated temperatures based on the palaeotemperature equation for inorganic calcite precipitation generally reflect mean annual temperatures of the upper water column, notably of thermocline depths. Although the present results suggest that the isotopic composition of T. heimii shells might be formed in equilibrium with the seawater in which the shells are being formed, future investigations are required to determine possible effects of metabolic and kinetic processes on the fractionation process. This pilot study therefore forms the basis for future investigations on the development of this tool and the determination of a species-specific palaeotemperature equation. The wide geographic and stratigraphic distribution of T. heimii cysts in sediments, the stable position of T. heimii within the water column and the high resistance of its cysts against calcite dissolution underline its potential for a wide usability in palaeotemperature reconstructions.
Median Latitude: -10.239833 * Median Longitude: -21.819867 * South-bound Latitude: -35.121667 * West-bound Longitude: -59.388333 * North-bound Latitude: 16.990000 * East-bound Longitude: 17.533333
Date/Time Start: 1996-01-04T00:00:00 * Date/Time End: 1998-05-25T14:54:00
Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 0.01 m
GeoB3603-1 * Latitude: -35.121667 * Longitude: 17.533333 * Date/Time: 1996-01-04T00:00:00 * Elevation: -2851.0 m * Recovery: 0.3 m * Location: Southern Cape Basin * Campaign: M34/1 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: Carbonate ooze. grayish to white
GeoB3723-2 * Latitude: -25.395000 * Longitude: 11.526667 * Date/Time: 1996-02-14T00:00:00 * Elevation: -4004.0 m * Recovery: 0.11 m * Location: Northern Cape Basin * Campaign: M34/2 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: FGB
GeoB3804-2 * Latitude: -30.743333 * Longitude: -8.770000 * Date/Time: 1996-02-27T00:00:00 * Elevation: -3882.0 m * Recovery: 0.14 m * Location: Mid Atlantic Ridge * Campaign: M34/3 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: all tubes filled
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepthmGeocode
6DateDateZonneveld, Karin A Fdata of analysis
7Thoracosphaera heimii, δ18OT. heimii δ18O‰ PDBZonneveld, Karin A FMass spectrometer Finnigan MAT 251
8Thoracosphaera heimii, δ13CT. heimii δ13C‰ PDBZonneveld, Karin A FMass spectrometer Finnigan MAT 251
108 data points

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