Sr/Ca and Cd/Ca ratios of benthic foraminifera in surface deep-sea sediments
Fuente:
PANGAEA
Salvato in:
| Autori principali: | , , |
|---|---|
| Natura: | Dataset Open Access |
| Lingua: | en |
| Pubblicazione: |
PANGAEA
1996
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1867168552587362304 |
|---|---|
| author | Elderfield, Henry Bertram, Caroline J Erez, Jonathan |
| author_facet | Elderfield, Henry Bertram, Caroline J Erez, Jonathan |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Measurements of Sr/Ca of benthic foraminifera show a linear decrease with water depth which is superimposed upon significant variability identified by analyses of individual foraminifera. New data for Cd/Ca support previous work in defining a contrast between waters shallower and deeper than ~2500 m. Measured element partition coefficients in foraminiferal calcium carbonate relative to sea water (D) have been described by means of a one-box model in which elements are extracted by Rayleigh distillation from a biomineralization reservoir that serves for calcification with a constant fractionation factor (alpha), such that D = (1 - f**alpha)/(l - f), where f is the proportion of Ca remaining after precipitation. A modification to the model recognises differences in element speciation. The model is consistent with differences between D[Sr], D[Ba], and D[Cd] in benthic but not planktonic foraminifera. Depth variations in D for Sr and Ba are consistent with the model, as are differences in depth variation of D[Cd] in calcitic and aragonitic benthic foraminifera. The shallower depth variations may reflect increasing calcification rates with increasing water depth to an optimum of about 2500 m. Observations of unusually lower DCd for some deep waters, not accompanied by similar [Sr], or D[Ba] may be because of dissolution or a calcification response to a lower carbonate saturation state. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_708384 |
| institution | PANGAEA |
| language | en |
| publishDate | 1996 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sr/Ca and Cd/Ca ratios of benthic foraminifera in surface deep-sea sediments Elderfield, Henry Bertram, Caroline J Erez, Jonathan BC; Biogeochemical Ocean Flux Study; BOFS; BOFS10K; BOFS11882#4; BOFS11890#2; BOFS11896#1; BOFS11905#1; BOFS14K; BOFS17K; BOFS5K; Box corer; Charles Darwin; D184; Discovery (1962); JGOFS; Joint Global Ocean Flux Study; KAL; Kasten corer; NEAP; NEAP-02B; NEAP-05B; NEAP-08B; NEAP-10B; NEAP-18B; NEAP-19B; NEAP-20B; Northeast Atlantic; PC; Piston corer; TR163-31; V22; V22-197; V27; V27-60; Vema Measurements of Sr/Ca of benthic foraminifera show a linear decrease with water depth which is superimposed upon significant variability identified by analyses of individual foraminifera. New data for Cd/Ca support previous work in defining a contrast between waters shallower and deeper than ~2500 m. Measured element partition coefficients in foraminiferal calcium carbonate relative to sea water (D) have been described by means of a one-box model in which elements are extracted by Rayleigh distillation from a biomineralization reservoir that serves for calcification with a constant fractionation factor (alpha), such that D = (1 - f**alpha)/(l - f), where f is the proportion of Ca remaining after precipitation. A modification to the model recognises differences in element speciation. The model is consistent with differences between D[Sr], D[Ba], and D[Cd] in benthic but not planktonic foraminifera. Depth variations in D for Sr and Ba are consistent with the model, as are differences in depth variation of D[Cd] in calcitic and aragonitic benthic foraminifera. The shallower depth variations may reflect increasing calcification rates with increasing water depth to an optimum of about 2500 m. Observations of unusually lower DCd for some deep waters, not accompanied by similar [Sr], or D[Ba] may be because of dissolution or a calcification response to a lower carbonate saturation state. |
| title | Sr/Ca and Cd/Ca ratios of benthic foraminifera in surface deep-sea sediments |
| topic | BC; Biogeochemical Ocean Flux Study; BOFS; BOFS10K; BOFS11882#4; BOFS11890#2; BOFS11896#1; BOFS11905#1; BOFS14K; BOFS17K; BOFS5K; Box corer; Charles Darwin; D184; Discovery (1962); JGOFS; Joint Global Ocean Flux Study; KAL; Kasten corer; NEAP; NEAP-02B; NEAP-05B; NEAP-08B; NEAP-10B; NEAP-18B; NEAP-19B; NEAP-20B; Northeast Atlantic; PC; Piston corer; TR163-31; V22; V22-197; V27; V27-60; Vema |
| url | https://doi.org/10.1594/PANGAEA.708384 |