Physics
Scientific paper
May 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965gecoa..29..385d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 29, Issue 5, pp.385-398
Physics
19
Scientific paper
Portions of the calcite and aragonite shell layers of west coast specimens of the pelecypod Mytilus were analyzed for strontium and magnesium by emission spectroscopy, X-ray fluorescence, and flame photometry. Most specimens came from localities where detailed temperature and salinity records are available. The strontium concentration in the calcitic outer prismatic layer correlates positively with growth temperature. In a given shell the strontium concentration of this layer varies seasonally through successive growth increments. Shell size has a small effect on the strontium concentration of the outer prismatic layer; larger shells have a slightly lower strontium concentration at a given temperature. Salinity variation does not appear to affect the strontium concentration of the outer prismatic layer. The strontium concentration in the aragonitic nacreous layer is negatively correlated with temperature. The magnesium concentration in the outer prismatic layer increases markedly with decreasing salinity and shows a weak positive correlation with temperature. The temperature-magnesium relationship varies between the two species examined in this study. Shell size also has an effect on the magnesium concentration in this layer; intermediate sized (50 mm long) shells have the highest concentration. The magnesium concentration of the nacreous layer is too low to be effectively measured with the techniques used in this study.
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