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- W2135165170 abstract "A low-blank, high sensitivity isotope dilution, ICP-MS analytical technique has been used to obtain REE abundance data from single conodont elements weighing as little as 5 μg. Sr isotopes can also be measured from the column eluants enabling Sr isotope ratios and REE abundance to be determined from the same dissolution. Results are comparable to published analyses comprising tens to hundreds of elements. To study the effects of thermal metamorphism on REE and strontium mobility in conodonts, samples were selected from a single bed adjacent to a basaltic dyke and from the internationally used colour alteration index (CAI) “standard set.” Our analyses span the range of CAI 1 to 8. Homogeneous REE patterns, “bell-shaped” shale-normalised REE patterns are observed across the range of CAI 1 to 6 in both sample sets. This pattern is interpreted as the result of adsorption during early diagenesis and could reflect original seawater chemistry. Above CAI 6 REE patterns become less predictable and perturbations from the typical REE pattern are likely to be due to the onset of apatite recrystallisation. Samples outside the contact aureole of the dyke have a mean 87Sr/86Sr ratio of 0.708165, within the broad range of published mid-Carboniferous seawater values. Our analysis indicates conodonts up to CAI 6 record primary geochemical signals that may be a proxy for ancient seawater." @default.
- W2135165170 created "2016-06-24" @default.
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- W2135165170 date "2001-02-01" @default.
- W2135165170 modified "2023-10-17" @default.
- W2135165170 title "Thermal effects on rare earth element and strontium isotope chemistry in single conodont elements" @default.
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- W2135165170 doi "https://doi.org/10.1016/s0016-7037(00)00548-2" @default.
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