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Dana Lecture. Rates of Fe, Mg, Mn, and Ca diffusion in garnet
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William D. Carlson
Published/Copyright:
March 31, 2015
Abstract
Extraction of the thermal and chemical histories preserved by modified compositional zoning in garnet is compromised by large uncertainties in experimentally determined diffusion coeficients for principal divalent cations. Some of this uncertainty derives from long down-temperature extrapolations, but much of it arises from an inability to account accurately for large variations in diffusivity as a function of garnet composition. Numerical simulation of stranded diffusion profiles in partially resorbed natural garnets constrains diffusivities at low temperature, and reveals a systematic dependence of diffusion rates on host garnet composition. A comprehensive model incorporating a simple compositional dependence allows accurate prediction of diffusion rates for Fe, Mg, Mn, and Ca for nearly all garnet compositions across the full range of geologically relevant temperatures, pressures, and oxygen fugacities.
Received: 2005-7-22
Accepted: 2005-8-19
Published Online: 2015-3-31
Published in Print: 2006-1-1
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Dana Lecture. Rates of Fe, Mg, Mn, and Ca diffusion in garnet
- An FTIR study of hydrogen in anorthoclase and associated melt inclusions
- First occurrence of iodine in natural sulfosalts: The case of mutnovskite, Pb2AsS3(I,Cl,Br), a new mineral from the Mutnovsky volcano, Kamchatka Peninsula, Russian Federation
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- Fe2+/Fe3+ charge ordering in contact layers of lamellar magnetism: Bond valence arguments
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- Anomalously high Fe contents in rehomogenized olivine-hosted melt inclusions from oxidized magmas
- The rate of ferrihydrite transformation to goethite via the Fe(II) pathway
- Phase transitions and volumetric properties of cryolite, Na3AlF6: Differential thermal analysis to 100 MPa
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