Sclerochronology and geochemical variation in limpet shells (Patella vulgata and Patella stellaeformis): evaluating a new proxy for Holocene climate change in coastal areas Public Deposited

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  • March 21, 2019
Creator
  • Fenger, Tracy Lynn
    • Affiliation: College of Arts and Sciences, Department of Geological Sciences
Abstract
  • Before reconstructing potential climate information preserved in Holocene archaeological shells of the European limpet, Patella vulgata, we studied the controls on δ18 and δ13 in modern specimens. We evaluated whether P. vulgata shells precipitate in isotopic equilibrium with the ambient water by comparing δ18OSHELL with expected values. Comparison revealed that δ18OSHELL values were 1.51±0.21‰ higher than expected (corresponding estimated SST was 6.5±2.5 °C lower than observed SST). However, an adjustment can account for this predictable vital effect to reliably reconstruct SST. Tropical species, P. stellaeformis, was evaluated to determine whether it displays a similar positive offset from equilibrium as P. vulgata. We tested the hypotheses that δ18OSHELL in tropical species displays vital effects and the disequilibrium would be constant and predictable. Our results indicated P. stellaeformis δ18OSHELL exhibits a negative offset from expected equilibrium. Differences in mineralogy or growth rates at different latitudes may influence mechanisms that cause vital effects.
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  • In Copyright
Advisor
  • Surge, Donna M.
Degree granting institution
  • University of North Carolina at Chapel Hill
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  • Open access
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