author_facet Rodland, David L.
Kowalewski, Michał
Dettman, David L.
Flessa, Karl W.
Atudorei, Viorel
Sharp, Zachary D.
Rodland, David L.
Kowalewski, Michał
Dettman, David L.
Flessa, Karl W.
Atudorei, Viorel
Sharp, Zachary D.
author Rodland, David L.
Kowalewski, Michał
Dettman, David L.
Flessa, Karl W.
Atudorei, Viorel
Sharp, Zachary D.
spellingShingle Rodland, David L.
Kowalewski, Michał
Dettman, David L.
Flessa, Karl W.
Atudorei, Viorel
Sharp, Zachary D.
The Journal of Geology
High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
author_sort rodland, david l.
spelling Rodland, David L. Kowalewski, Michał Dettman, David L. Flessa, Karl W. Atudorei, Viorel Sharp, Zachary D. 0022-1376 1537-5269 The University of Chicago Press https://www.jstor.org/stable/10.1086/375283 <label>Abstract</label> <p>Laser ablation and silver phosphate procedures were used to measure the oxygen isotope composition in organophosphatic shells of lingulid brachiopods at a variety of scales: within valves, between valves from the same individual, between individuals collected at the same location at the same time, between localities, and between modern and fossil specimens. Specimens included modern lingulids from several patches in the northern Gulf of California (Mexico) and the Gulf of Nicoya (Costa Rica), and fossil specimens from the lower Triassic Dinwoody Formation. All specimens display a high degree of intrashell variability, frequently exceeding 4‰. This variability is not symmetrical within the shell, does not appear to reflect growth bands, and is not consistent with a published lingulid phosphate‐oxygen isotope thermometer. Shells analyzed using silver phosphate preparations have variability similar (&gt;3.5‰) to that of shells analyzed using the laser ablation technique, ruling out the influence of organic carbon contamination. We interpret this variation as primary, representing a vital effect, possibly the result of enzymatic fractionation near mantle canals and muscle scars or in vivo mineralogical changes in shell composition. In contrast, oxygen isotope analysis of carbonate from these shells is repeatable and appears to represent equilibrium values. Although oxygen isotope analyses from laser ablation and silver phosphate methods indicate that the phosphate in lingulid valves is an unreliable recorder of oxygen isotope ratios in seawater, it may be possible to derive paleoclimate data from the carbonate fraction.</p> High‐Resolution Analysis of δ<sup>18</sup>O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods The Journal of Geology
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title High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
title_unstemmed High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
title_full High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
title_fullStr High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
title_full_unstemmed High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
title_short High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
title_sort high‐resolution analysis of δ18o in the biogenic phosphate of modern and fossil lingulid brachiopods
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description Abstract Laser ablation and silver phosphate procedures were used to measure the oxygen isotope composition in organophosphatic shells of lingulid brachiopods at a variety of scales: within valves, between valves from the same individual, between individuals collected at the same location at the same time, between localities, and between modern and fossil specimens. Specimens included modern lingulids from several patches in the northern Gulf of California (Mexico) and the Gulf of Nicoya (Costa Rica), and fossil specimens from the lower Triassic Dinwoody Formation. All specimens display a high degree of intrashell variability, frequently exceeding 4‰. This variability is not symmetrical within the shell, does not appear to reflect growth bands, and is not consistent with a published lingulid phosphate‐oxygen isotope thermometer. Shells analyzed using silver phosphate preparations have variability similar (&gt;3.5‰) to that of shells analyzed using the laser ablation technique, ruling out the influence of organic carbon contamination. We interpret this variation as primary, representing a vital effect, possibly the result of enzymatic fractionation near mantle canals and muscle scars or in vivo mineralogical changes in shell composition. In contrast, oxygen isotope analysis of carbonate from these shells is repeatable and appears to represent equilibrium values. Although oxygen isotope analyses from laser ablation and silver phosphate methods indicate that the phosphate in lingulid valves is an unreliable recorder of oxygen isotope ratios in seawater, it may be possible to derive paleoclimate data from the carbonate fraction.
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author Rodland, David L., Kowalewski, Michał, Dettman, David L., Flessa, Karl W., Atudorei, Viorel, Sharp, Zachary D.
author_facet Rodland, David L., Kowalewski, Michał, Dettman, David L., Flessa, Karl W., Atudorei, Viorel, Sharp, Zachary D., Rodland, David L., Kowalewski, Michał, Dettman, David L., Flessa, Karl W., Atudorei, Viorel, Sharp, Zachary D.
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description Abstract Laser ablation and silver phosphate procedures were used to measure the oxygen isotope composition in organophosphatic shells of lingulid brachiopods at a variety of scales: within valves, between valves from the same individual, between individuals collected at the same location at the same time, between localities, and between modern and fossil specimens. Specimens included modern lingulids from several patches in the northern Gulf of California (Mexico) and the Gulf of Nicoya (Costa Rica), and fossil specimens from the lower Triassic Dinwoody Formation. All specimens display a high degree of intrashell variability, frequently exceeding 4‰. This variability is not symmetrical within the shell, does not appear to reflect growth bands, and is not consistent with a published lingulid phosphate‐oxygen isotope thermometer. Shells analyzed using silver phosphate preparations have variability similar (&gt;3.5‰) to that of shells analyzed using the laser ablation technique, ruling out the influence of organic carbon contamination. We interpret this variation as primary, representing a vital effect, possibly the result of enzymatic fractionation near mantle canals and muscle scars or in vivo mineralogical changes in shell composition. In contrast, oxygen isotope analysis of carbonate from these shells is repeatable and appears to represent equilibrium values. Although oxygen isotope analyses from laser ablation and silver phosphate methods indicate that the phosphate in lingulid valves is an unreliable recorder of oxygen isotope ratios in seawater, it may be possible to derive paleoclimate data from the carbonate fraction.
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spelling Rodland, David L. Kowalewski, Michał Dettman, David L. Flessa, Karl W. Atudorei, Viorel Sharp, Zachary D. 0022-1376 1537-5269 The University of Chicago Press https://www.jstor.org/stable/10.1086/375283 <label>Abstract</label> <p>Laser ablation and silver phosphate procedures were used to measure the oxygen isotope composition in organophosphatic shells of lingulid brachiopods at a variety of scales: within valves, between valves from the same individual, between individuals collected at the same location at the same time, between localities, and between modern and fossil specimens. Specimens included modern lingulids from several patches in the northern Gulf of California (Mexico) and the Gulf of Nicoya (Costa Rica), and fossil specimens from the lower Triassic Dinwoody Formation. All specimens display a high degree of intrashell variability, frequently exceeding 4‰. This variability is not symmetrical within the shell, does not appear to reflect growth bands, and is not consistent with a published lingulid phosphate‐oxygen isotope thermometer. Shells analyzed using silver phosphate preparations have variability similar (&gt;3.5‰) to that of shells analyzed using the laser ablation technique, ruling out the influence of organic carbon contamination. We interpret this variation as primary, representing a vital effect, possibly the result of enzymatic fractionation near mantle canals and muscle scars or in vivo mineralogical changes in shell composition. In contrast, oxygen isotope analysis of carbonate from these shells is repeatable and appears to represent equilibrium values. Although oxygen isotope analyses from laser ablation and silver phosphate methods indicate that the phosphate in lingulid valves is an unreliable recorder of oxygen isotope ratios in seawater, it may be possible to derive paleoclimate data from the carbonate fraction.</p> High‐Resolution Analysis of δ<sup>18</sup>O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods The Journal of Geology
spellingShingle Rodland, David L., Kowalewski, Michał, Dettman, David L., Flessa, Karl W., Atudorei, Viorel, Sharp, Zachary D., The Journal of Geology, High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
title High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
title_full High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
title_fullStr High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
title_full_unstemmed High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
title_short High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
title_sort high‐resolution analysis of δ18o in the biogenic phosphate of modern and fossil lingulid brachiopods
title_unstemmed High‐Resolution Analysis of δ18O in the Biogenic Phosphate of Modern and Fossil Lingulid Brachiopods
url https://www.jstor.org/stable/10.1086/375283, https://doi.org/10.1086/375283