Magnesium concentrations of individual shells of Globorotalia truncatulinoides
Cobertura |
MEDIAN LATITUDE: 0.712421 * MEDIAN LONGITUDE: 3.353429 * SOUTH-BOUND LATITUDE: -39.720000 * WEST-BOUND LONGITUDE: -63.496267 * NORTH-BOUND LATITUDE: 23.000917 * EAST-BOUND LONGITUDE: 99.250000 * DATE/TIME START: 1958-04-29T00:00:00 * DATE/TIME END: 1996-05-23T00:00:00 |
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Data(s) |
01/12/2004
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Resumo |
Recent work has provided useful Mg/Ca to water temperature calibrations for shallow-dwelling planktonic foraminifer species. Globorotalia truncatulinoides (right coiling (R)) is a deep-dwelling species that can serve as a source of information about the temporal variability in the water characteristics of the thermocline. We present a temperature calibration for the Mg/Ca in the shell of G. truncatulinoides (R) and examine some of the practical issues associated with evaluating the usefulness of the technique. The Mg/Ca in the primary and the secondary calcite of individual G. truncatulinoides (R) correlates exponentially with water column temperatures, showing a change of ~10% in the Mg/Ca per 1°C (R**2 = 0.92). A limited comparison with plankton tow samples demonstrates that the average Mg/Ca temperature was offset +1°C from the average temperature calculated using the d18O calibration of O'Neil et al. (1969, doi:10.1063/1.1671982), and the Mg/Ca temperatures have a range similar to the ?18O temperatures. Comparisons of the [Mg] in the core top samples to water depth of deposition indicates that dissolution does not alter the measured value of Mg in the primary calcite. |
Formato |
application/zip, 2 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.839816 doi:10.1594/PANGAEA.839816 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: McKenna, VS; Prell, Warren L (2004): Calibration of the Mg/Ca of Globorotalia truncatulinoides (R) for the reconstruction of marine temperature gradients. Paleoceanography, 19(2), PA2006, doi:10.1029/2000PA000604 |
Palavras-Chave | #Ca; Calcium; Calcium, standard deviation; Ca std dev; Depth; DEPTH, sediment/rock; DEPTH, water; Depth water; Event; Label; Magnesium; Magnesium, standard deviation; Magnesium/Calcium ratio; Magnesium/Calcium ratio, standard deviation; Mg; Mg/Ca; Mg/Ca std dev; Mg std dev; N; Samp com; Sample amount; Sample code/label; Sample comment |
Tipo |
Dataset |