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dc.contributor.authorClarke, Leon J.*
dc.contributor.authorKennedy, H.A.*
dc.contributor.authorRichardson, C.A.*
dc.contributor.authorFreitas, P.S.*
dc.date.accessioned2011-02-02T16:17:08Z
dc.date.available2011-02-02T16:17:08Z
dc.date.issued2009
dc.identifier.citationFreitas, P. S., Clarke, L. J., Kennedy, H. and Richardson, C. A. (2009). Ion microprobe assessment of the heterogeneity of Mg/Ca, Sr/Ca and Mn/Ca ratios in Pecten maximus and Mytilus edulis (bivalvia) shell calcite precipitated at constant temperature. Biogeosciences. Vol. 6, pp. 1209-1227.en_US
dc.identifier.urihttp://hdl.handle.net/10454/4767
dc.descriptionnoen_US
dc.description.abstractSmall-scale heterogeneity of biogenic carbonate elemental composition can be a significant source of error in the accurate use of element/Ca ratios as geochemical proxies. In this study ion microprobe (SIMS) profiles showed significant small-scale variability of Mg/Ca, Sr/Ca and Mn/Ca ratios in new shell calcite of the marine bivalves Pecten maximus and Mytilus edulis that was precipitated during a constant-temperature culturing experiment. Elevated Mg/Ca, Sr/Ca and Mn/Ca ratios were found to be associated with the deposition of elaborate shell features, i.e. a shell surface stria in P. maximus and surface shell disturbance marks in both species, the latter a common occurrence in bivalve shells. In both species the observed small-scale elemental heterogeneity most likely was not controlled by variable transport of ions to the extra-pallial fluid, but by factors such as the influence of shell organic content and/or crystal size and orientation, the latter reflecting conditions at the shell crystalsolution interface. In the mid and innermost regions of the P. maximus shell the lack of significant small-scale variation of Mg/Ca ratios, which is consistent with growth at constant temperature, suggest a potential application as a palaeotemperature proxy. Cross-growth band element/Ca ratio profiles in the interior of bivalve shells may provide more promising palaeo-environmental tools than sampling from the outer region of bivalve shells.en_US
dc.language.isoenen_US
dc.subjectSr/Ca and Mn/Ca ratiosen_US
dc.subjectHeterogeneity of Mg/Caen_US
dc.subjectConstant temperatureen_US
dc.subjectShell calciteen_US
dc.titleIon microprobe assessment of the heterogeneity of Mg/Ca, Sr/Ca and Mn/Ca ratios in Pecten maximus and Mytilus edulis (bivalvia) shell calcite precipitated at constant temperature.en_US
dc.status.refereedYesen_US
dc.typeArticleen_US


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