A biomineralization model for the incorporation of trace elements into foraminiferal calcium carbonate

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doi: 10.1016/0012-821X(96)00105-7
Authors:Elderfield, H.; Bertram, C. J.; Erez, J.
Author Affiliations:Primary:
University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Hebrew University of Jerusalem, Jerusalem, Israel
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 142(3-4), p.409-423. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:1996
Note:In English. Includes an appendix. 35 refs.; illus., incl. 2 tables
Summary: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 (α), such that D = (1-fα)/(1-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 DSr, DBa and DCd 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 DCd 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 DSr or DBa, may be because of dissolution or a calcification response to a lower carbonate saturation state. Abstract Copyright (1996) Elsevier, B.V.
Subjects:Alkaline earth metals; Anomalinidae; Benthic taxa; Biochemistry; Biomineralization; Buliminacea; Cadmium; Calcium; Calcium carbonate; Cassidulinacea; Cenozoic; Chemical ratios; Cibicidoides; Cibicidoides wuellerstorfi; Cores; Depth indicators; Experimental studies; Foraminifera; Geochemistry; Holocene; Marine sediments; Metals; Paleo-oceanography; Partition coefficients; Quaternary; Rotaliina; Sediments; Strontium; Trace elements; Uvigerina; Uvigerinidae; Atlantic Ocean; Equatorial Pacific; North Atlantic; Ontong Java Plateau; Pacific Ocean; West Pacific; Invertebrata; Protista
Abstract Numbers:97M/527
Record ID:1996076055
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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