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Gussone, Nikolaus; Kuhnert, Henning; Zonneveld, Karin A F (2010): (Table 1) Calcium isotope composition, Mg/Ca, Sr/Ca and U/Ca ratios of calcareous cysts of Thoracosphaera heimii. PANGAEA, https://doi.org/10.1594/PANGAEA.744950, Supplement to: Gussone, Nikolaus; Zonneveld, Karin A F; Kuhnert, Henning (2010): Minor element and Ca isotope composition of calcareous dinoflagellate cysts of Thoracosphaera heimii. Earth and Planetary Science Letters, 289, 180-188, https://doi.org/10.1016/j.epsl.2009.11.006

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Abstract:
We investigated the influences of temperature, salinity and pH on the calcium isotope as well as trace and minor element (uranium, strontium, magnesium) to Ca ratios on calcium carbonate cysts of the calcareous dinoflagellate species Thoracosphaera heimii grown in laboratory cultures. The natural habitat of this species is the photic zone (preferentially at the chlorophyll maximum depth) of temperate to tropical oceans, and it is abundant in deep-sea sediments over the entire Cenozoic. In our experiments, temperatures ranged from 12 to 30 °C, salinity from 36.5 to 38.8 and pH from 7.9 to 8.4. The delta44/40Ca of T. heimii cysts resembles that of other marine calcifiers, including coccolithophores, foraminifers and corals. However, its temperature sensitivity is considerably smaller and statistically insignificant, and T. heimii might serve as a recorder of changes in seawater delta44/40Ca over geologic time. The Sr/Ca ratios of T. heimii cysts show a pronounced temperature sensitivity (0.016 mmol/mol °C**-1) and have the potential to serve as a palaeo-sea surface temperature proxy. No clear temperature- and pH-dependences were observed for Mg/Ca. U/Ca seems to be influenced by temperature and pH, but the correlations change sign at 23 °C and pH 8.2, respectively.
Coverage:
Median Latitude: 18.650850 * Median Longitude: -11.500000 * South-bound Latitude: 3.000000 * West-bound Longitude: -42.000000 * North-bound Latitude: 34.301700 * East-bound Longitude: 19.000000
Minimum DEPTH, water: m * Maximum DEPTH, water: m
Event(s):
GeoB_strain_116 * Latitude: 3.000000 * Longitude: -42.000000 * Location: Eastern Mediterranean Sea * Campaign: M38/2 * Basis: Meteor (1986) * Method/Device: Biology (BIO)
GeoB_strain_92 * Latitude: 34.301700 * Longitude: 19.000000 * Location: Equatorial Atlantic * Campaign: M40/4 * Basis: Meteor (1986) * Method/Device: Biology (BIO)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, waterDepth watermGeocode
6Sample code/labelSample labelGussone, Nikolaus
7Temperature, technicalT tech°CGussone, Nikolaus
8SalinitySalGussone, Nikolaus
9pHpHGussone, Nikolaus
10Sample massSamp mgGussone, NikolausSample weight
11δ44/40 Caδ44/40 Ca‰ SRM 915aGussone, Nikolaus
12Standard errorStd e±Gussone, Nikolaus2se
13NumberNoGussone, Nikolausn
14δ mu CalciumδmuCappm/amuGussone, Nikolaus
15Standard errorStd e±Gussone, Nikolaus2se
16Isotope fractionation between growth medium and carbonate1000lnalphaGussone, Nikolaus
17--Gussone, Nikolaus10**6lnalphamu
18Magnesium/Calcium ratioMg/Cammol/molGussone, Nikolaus
19Strontium/Calcium ratioSr/Cammol/molGussone, Nikolaus
20Uranium/Calcium ratioU/Caµmol/molGussone, Nikolaus
21Magnesium/Calcium ratioMg/Cammol/molGussone, Nikolaus
22Strontium/Calcium ratioSr/Cammol/molGussone, Nikolaus
23Uranium/Calcium ratioU/Caµmol/molGussone, Nikolaus
24Exchange coefficientKdGussone, NikolausKdMg
25Exchange coefficientKdGussone, NikolausKdSr
26Exchange coefficientKdGussone, NikolausKdU
Size:
629 data points

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