Mg/Ca ratio, Sr/Ca ratio and stable isotopes of the foraminifera Oridorsalis umbonatus in surface sediment samples


Autoria(s): Rathmann, Söhnke; Kuhnert, Henning
Cobertura

MEDIAN LATITUDE: -25.222000 * MEDIAN LONGITUDE: 13.061833 * SOUTH-BOUND LATITUDE: -25.610000 * WEST-BOUND LONGITUDE: 11.526667 * NORTH-BOUND LATITUDE: -24.251667 * EAST-BOUND LONGITUDE: 13.686667 * DATE/TIME START: 1996-02-11T00:00:00 * DATE/TIME END: 2003-02-27T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.005 m * MAXIMUM DEPTH, sediment/rock: 0.005 m

Data(s)

24/05/2008

Resumo

We investigate the influence of carbonate system parameters (carbonate ion concentration, [CO3**2-]; carbonate ion saturation, Delta [CO3**2-]) on the trace element and stable isotope ratios in the endobenthic foraminifera Oridorsalis umbonatus. Data from modern core top samples from the Namibian continental slope suggest that the shell composition of this species is influenced by the chemistry of the pore-water. For these organic-rich sediments, the impact of ocean bottom water properties on both pore-water and shell chemistry is surprisingly small. Sr/Ca correlates positively with [CO3**2-] and to a lesser extent with Delta [CO3**2-], which is opposed to previous results. A [CO3**2-] decrease of 10 µmol/kg leads to an increase of 0.05 mmol/mol in Sr/Ca. We observe a correlation between shell d18O (corrected for temperature and d18O seawater) and [CO3**2-], however, the variability of the corrected d18O is close to the analytical limit. No clear dependences were observed for d13C and Mg/Ca.

Formato

text/tab-separated-values, 60 data points

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.586871

doi:10.1594/PANGAEA.586871

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Rathmann, Söhnke; Kuhnert, Henning (2008): Carbonate ion effect on Mg/Ca, Sr/Ca and stable isotopes on the benthic foraminifera Oridorsalis umbonatus off Namibia. Marine Micropaleontology, 66(2), 120-133, doi:10.1016/j.marmicro.2007.08.001

Palavras-Chave #Center for Marine Environmental Sciences; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; Event label; GeoB3717-1; GeoB3720-1; GeoB3721-4; GeoB3723-2; GeoB8403-1; GeoB8430-2; GeoB8449-1; GeoB8450-1; GeoB8452-1; GeoB8462-4; LA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer; Latitude of event; Longitude of event; M34/2; M57/2; MARUM; Mass spectrometer Finnigan MAT 251; Meteor (1986); MUC; MultiCorer; Northern Cape Basin; Oridorsalis umbonatus, d13C; Oridorsalis umbonatus, d18O; Oridorsalis umbonatus, Magnesium/Calcium ratio; Oridorsalis umbonatus, Strontium/Calcium ratio; Walvis Bay/Namibia
Tipo

Dataset