Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 110, Issue 2, Pages 419-424Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1209513110
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Funding
- Boise State University
- National Science Foundation [EAR 0819837]
- American Association of Petroleum Geologists-David Worthington Family grants
- Society for Sedimentary Geologist-Friedman Student Research grant
- South Dakota School of Mines and Technology
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Diffusion rates of numerous trace elements in bone at 20 degrees C were determined using laser-ablation inductively coupled plasma mass spectrometry analysis of experimentally induced diffusion profiles. Diffusivities are about 1 order of magnitude slower than current semiquantitative geochemical views and about 1.5 orders of magnitude faster than indirect radiotracer estimates. Intrabone volume diffusion is too slow and too similar among many elements to explain trace element profiles in young fossils and archeological materials. Diffusivity differences among elements do, however, explain disparate biokinetic washout of Sr vs. Ba and of light vs. heavy rare earth elements (REEs). These results improve the understanding of the physical principles underlying biokinetic models and rates and mechanisms of trace element alteration of phosphatic tissues in paleontological, archeological, and crystal-chemical contexts. Recrystallization and transport limitations in soils explain trace element profiles in young fossils better than intrabone volume diffusion alone and imply that diffusion of REE and other trivalent cations is likely controlled by a common charge-compensating species rather than ionic radii or partition coefficients.
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