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• W4246299649 abstract "Brachiopods from the Demissa Bed (Middle Devonian, Hamilton Group) biologically regulated the incorporation of Mg, Sr and Na into their shell calcite. Significant taxonomic differences in the elemental contents of three species (Athyris spiriferoides, Mediospirifer audacula and Mucrospirifer mucronatus) may be related to differences in calcification processes. In contrast, no significant difference or “vital effects” were observed between the isotopic values of Mediospirifer audacula and Athyris spiriferoides from Erie (Δ18O=0.03‰, p=0.949; Δ13C=0.76‰, p=0.083) and Genessee Counties (Δ18O=0.39‰, p=0.471; Δ13C=0.06‰, p=0.854). This suggests that these brachiopods did not exert a biological control over their isotopic compositions, and that their shell calcites reflect ambient physicochemical conditions. Isotopic compositions in unaltered shell calcites of brachiopods from Genessee County, which was close to the basin depocentre, are heavy for carbon (δ13C, χ=+5.01‰, PDB) and oxygen (δ18C, χ=−2.85‰, PDB) compared to the species sampled at the basin's edge (Erie County; (δ13C, χ=+2.79‰, PDB; δ18O, χ=−3.83‰, PDB). There is a significant separation in isotopic values between the deeper- and shallower-water brachiopods of the basin ((δ18O=0.98‰, p=0.0005; Δ13C=2.22‰, p=0.0005). The δ18O variation suggests a temperature/salinity change with water depth, whereas the change in δ13C composition probably records an enrichment /depletion of organic matter with water depth. This observation has significant implications for Paleozoic ocean isotopic-evolution studies, because many global changes in marine δ18O and δ13C are based on isotopic shifts of similar magnitude." @default.
• W4246299649 created "2022-05-12" @default.
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• W4246299649 date "1991-11-01" @default.
• W4246299649 modified "2023-09-30" @default.
• W4246299649 title "Environmental and physiological influences on isotopic and elemental compositions of brachiopod shell calcite: Implications for the isotopic evolution of Paleozoic oceans" @default.
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• W4246299649 doi "https://doi.org/10.1016/0168-9622(91)90041-t" @default.
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