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Updated: Jul 31, 2025

Formation of Thick Dense Yttrium Iron Garnet Films Using Aerosol Deposition
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Published on: May 15, 2015

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Garnet crystallization does not drive oxidation at arcs.

Megan Holycross1,2, Elizabeth Cottrell2

  • 1Cornell University, Ithaca, NY 14853, USA.

Science (New York, N.Y.)
|May 4, 2023
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Summary
This summary is machine-generated.

Garnet crystallization does not explain the iron depletion or oxidation in arc magmas. Experiments show garnets remove similar amounts of both iron forms, altering melt oxidation negligibly.

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Area of Science:

  • Geochemistry
  • Petrology
  • Experimental Mineralogy

Background:

  • Arc magmas, crucial for continental crust, show distinct iron (Fe) depletions and higher oxidation states (Fe3+/∑Fe ratios) compared to mid-ocean ridge magmas.
  • Garnet crystallization has been proposed as a mechanism to explain these differences by selectively removing Fe2+ over Fe3+.

Purpose of the Study:

  • To experimentally test the hypothesis that garnet crystallization drives iron depletion and oxidation in arc magmas.
  • To determine the partitioning behavior of Fe2+ and Fe3+ between garnet and silicate melts.

Main Methods:

  • Laboratory-based crystallization experiments were conducted using synthetic arc magma compositions.
  • Garnets and coexisting melts were analyzed to quantify iron speciation and partitioning.

Main Results:

  • Garnet crystallization removes approximately 20% of total iron from primary arc basalts.
  • The Fe3+/∑Fe ratio and oxygen fugacity (fO2) of the melt are negligibly altered by garnet crystallization.
  • Experimental data reveal similar compatibilities for Fe2+ and Fe3+ in garnet.

Conclusions:

  • Garnet crystallization is unlikely to be the primary cause of iron depletion and elevated oxidation states in basaltic arc magmas.
  • The observed characteristics of arc magmas suggest alternative petrogenetic processes are responsible for continental crust formation.