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Well-preserved low-Mg calcite tests of modern benthic foraminifera from a depth transect off SW Norwayshow decreasing Sr/Ca with increasing water depth (r = –0.84). The Mg/Ca ratios also decrease with increasing waterdepth, although in a curvilinear fashion. Moreover, the inter- and intra-species scatter is apparently larger than for Sr/Ca.A majority of the analysed specimens have Mn/Ca < 200 μmol/mol, and show Sr/Ca, Mg/Ca that fall within publishedranges for benthic foraminiferal calcite, indicating that pristine biogenic calcite has been analysed. The uniformtemperature and salinity of bottom waters below ~800 m moreover indicate that neither temperature nor salinity canexplain the observed Me/Ca trends. The Sr/Ca and Mg/Ca depth trends cannot be explained by dissolution since bottomwaters are generally supersaturated with respect to calcite, and dissolution is only observed in a few specimens. Moreover,a regular increase in sedimentary organic content with depth needed to invoke a decrease in porewater pH andconcomittant calcite dissolution is not observed. We tentatively ascribe the decreasing Sr/Ca and Mg/Ca trends to depthrelatedphysiological phenomena. The relatively small intra- and interspecies scatter at a given water depth, as well as thelinear decrease in Sr/Ca ratios with increasing water depth observed in modern oceans, may render the Sr/Ca in calciticbenthic foraminifera a potential water-depth proxy for fossil deposits

Sr/Ca in Calcitic Tests of Benthic Foraminifera - A Potential Water-Depth Proxy?~!2009-09-15~!2009-10-28~!2009-12-31~!