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Sr/Ca in Calcitic Tests of Benthic Foraminifera - A Potential Water-Depth Proxy?

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dc.contributor.author Sælen, Gunnar
dc.contributor.author Kristensen, Dorthe Klitgaard
dc.contributor.author Westerlund, Stig
dc.contributor.author Jansen, Eystein
dc.date.accessioned 2011-02-09T14:14:49Z
dc.date.available 2011-02-09T14:14:49Z
dc.date.issued 2009
dc.identifier.citation The Open Geology Journal 3: 90-97 en_US
dc.identifier.uri http://hdl.handle.net/1956/4489
dc.identifier.uri http://dx.doi.org/10.2174/1874262900903010090
dc.description.abstract Well-preserved low-Mg calcite tests of modern benthic foraminifera from a depth transect off SW Norway show decreasing Sr/Ca with increasing water depth (r = –0.84). The Mg/Ca ratios also decrease with increasing water depth, 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 published ranges for benthic foraminiferal calcite, indicating that pristine biogenic calcite has been analysed. The uniform temperature and salinity of bottom waters below ~800 m moreover indicate that neither temperature nor salinity can explain the observed Me/Ca trends. The Sr/Ca and Mg/Ca depth trends cannot be explained by dissolution since bottom waters 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 and concomittant calcite dissolution is not observed. We tentatively ascribe the decreasing Sr/Ca and Mg/Ca trends to depthrelated physiological phenomena. The relatively small intra- and interspecies scatter at a given water depth, as well as the linear decrease in Sr/Ca ratios with increasing water depth observed in modern oceans, may render the Sr/Ca in calcitic benthic foraminifera a potential water-depth proxy for fossil deposits. en_US
dc.language.iso eng en_US
dc.publisher Bentham Open en
dc.rights Copyright Sælen et al.; Licensee Bentham Open. en_US
dc.rights.uri http://creativecommons.org/licenses/by-nc/3.0/ en_US
dc.subject Benthic foraminifera en
dc.subject Sr/Ca en
dc.subject Paleowater-depth proxy en
dc.title Sr/Ca in Calcitic Tests of Benthic Foraminifera - A Potential Water-Depth Proxy? en_US
dc.type Peer reviewed en_US
dc.type Journal article en_US
dc.subject.nsi VDP::Mathematics and natural science: 400::Geosciences: 450 en_US
dc.rightsHolder Sælen et al. en_US
dc.type.version publishedVersion en_US


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