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Interface coupled dissolution-reprecipitation in garnet from subducted granulites and ultrahigh-pressure rocks revealed by phosphorous, sodium, and titanium zonation

  • Jay J. Ague EMAIL logo and Jennifer A. Axler
Published/Copyright: July 7, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 7

Abstract

Garnet zonation provides an unparalleled record of the pressure-temperature-time-fluid evolution of metamorphic rocks. At extreme temperature conditions >900 °C, however, most elements preserve little zonation due to intracrystalline diffusional relaxation. Under these conditions, slowly diffusing trace elements including P, Na, and Ti have the best chance of recording metamorphic histories. Here we map dramatic zoning patterns of these elements in subducted high-pressure felsic granulite (Saxon Granulite Massif) and ultrahigh-pressure diamondiferous “saidenbachite” (Saxonian Erzgebirge, Bohemian Massif). The results show that garnet replacement via interface coupled dissolution-reprecipitation can strongly affect garnet compositions in subduction zones and that P, Na, and Ti record burial and exhumation histories that are otherwise lost to diffusion. In these samples, P diffuses the slowest, and Ti the fastest.

Keywords: Metamorphic petrology; garnet; trace elements and REE; diffusion; major and minor elements; kinetics

Acknowledgments

We thank M.R. Ackerson and P.J. O’Brien for discussions, P.J. O’Brien for providing sample SB2 of diamondiferous saidenbachite, James O. Eckert Jr., for EPMA assistance, L.P. Baumgartner, A. Putnis, and an anonymous referee for very constructive and helpful reviews, and the National Science Foundation Directorate of Geosciences (EAR-0744154, EAR-1250269) and Yale University for support.

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Received: 2016-1-31
Accepted: 2016-3-21
Published Online: 2016-7-7
Published in Print: 2016-7-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5707
Keywords for this article
Metamorphic petrology; garnet; trace elements and REE; diffusion; major and minor elements; kinetics

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  1. Highlights and Breakthroughs
  2. New evidence for lunar basalt metasomatism by underlying regolith
  3. Highlights and Breakthroughs
  4. Alunite on Mars
  5. Special collection: martian rocks and minerals: perspectives from rovers, orbiters, and meteorites
  6. Constraints on iron sulfate and iron oxide mineralogy from ChemCam visible/near-infrared reflectance spectroscopy of Mt. Sharp basal units, Gale Crater, Mars
  7. Special collection: martian rocks and minerals: perspectives from rovers, orbiters, and meteorites
  8. Esperance: Multiple episodes of aqueous alteration involving fracture fills and coatings at Matijevic Hill, Mars
  9. Special collection: Martian rocks and minerals: perspectives from rovers, orbiters, and meteorites
  10. Discovery of alunite in cross crater, terra sirenum, mars: evidence for acidic, sulfurous waters
  11. Special collection: perspectives on origins and evolution of crustal magmas
  12. Granitoid magmas preserved as melt inclusions in high-grade metamorphic rocks
  13. Chemistry and mineralogy of earth’s mantle
  14. Incorporation of Fe2+ and Fe3+ in bridgmanite during magma ocean crystallization
  15. Special collection: mechanisms, rates, and timescales of geochemical transport processes in the crust and mantle
  16. Hydrogen diffusion in Ti-doped forsterite and the preservation of metastable point defects
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  30. High-pressure compressibility and thermal expansion of aragonite
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  32. Electronic transitions of iron in almandine-composition glass to 91 GPa
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