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Trace element heterogeneity along isochronous growth layers in bivalve shell Consequences for environmental reconstruction

, : Trace element heterogeneity along isochronous growth layers in bivalve shell Consequences for environmental reconstruction. Palaeogeography, Palaeoclimatology, Palaeoecology 373: 39-49

To precisely reconstruct environmental changes from high-resolution bivalve shell geochemistry, the shell layers must represent environmental conditions at the time of deposition. Therefore, calcium carbonate along growth lines that formed at the same time should show the same geochemical signature. We test this assumption by evaluating the geochemical spatial homogeneity along growth layers (i.e., shell secreted at a given time) on shell cross-sections of modern shells of the bivalve Protothaca thaca, for ontogenically young and old specimens. Analyses were carried out using laser ablation ICP-MS and solution nebulization ICP-MS. Scanning electron microscope images showed signs of early diagenesis of old. Highlights: Evaluation of geochemical homogeneity of isochronous growth layer on modern bivalves. SEM observation of shell dissolution on shell portion close to the umbo. Differences in trace element distribution along isochronous layer for old and recent shell section. Trace element incorporation process may vary with the age of the specimen. Mantle zonation is assumed to explain Mg/Ca heterogeneity along isochronous layers of recent shell. High-spatial analytical technique procedure for molluscan shell study must be precisely defined.


DOI: 10.1016/j.palaeo.2011.04.024

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