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- W2895918545 abstract "Abstract Oxygen isotope ratios (δ 18 O) measured from planktic foraminifer shells are commonly used to reconstruct past surface ocean conditions, yet the shells of many planktic foraminifers are an aggregate mixture of multiple carbonate phases with differing δ 18 O compositions. Here we demonstrate how secondary ion mass spectrometry can be used to measure intrashell δ 18 O heterogeneity by performing in situ analyses on micrometer‐scale (3–10 μm) domains within individual shells of the extant, mixed layer species Trilobatus sacculifer . Secondary ion mass spectrometry measurements on shells taken from Holocene‐aged sediments at three sites in different ocean basins confirm that the δ 18 O of gametogenic (GAM) calcite added to shells during the terminal (reproductive) stage of the life cycle is 1.0–1.4‰ higher than that of pregametogenic calcite. Examination of shells in cross section reveals that many have suffered varying degrees of internal dissolution, which further skews whole‐shell δ 18 O compositions toward higher values by preferentially removing low δ 18 O pregametogenic calcite. The results of this study echo the calls of earlier studies cautioning that spatiotemporal changes in the proportion of high δ 18 O GAM calcite should be considered when assessing T . sacculifer δ 18 O records generated via conventional isotope ratio mass spectrometry." @default.
- W2895918545 created "2018-10-26" @default.
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- W2895918545 date "2018-11-01" @default.
- W2895918545 modified "2023-10-14" @default.
- W2895918545 title "Combined Effects of Gametogenic Calcification and Dissolution on <scp> δ <sup>18</sup> O </scp> Measurements of the Planktic Foraminifer <scp> <i>Trilobatus sacculifer</i> </scp>" @default.
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- W2895918545 doi "https://doi.org/10.1029/2018gc007908" @default.
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