Magnesium concentrations of individual shells of Globorotalia truncatulinoides


Autoria(s): McKenna, VS; Prell, Warren L
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

Data(s)

01/12/2004

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