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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu


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1945-3027
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Volume 104, Issue 5

Issues

The effect of oxidation on the mineralogy and magnetic properties of olivine

Joseph Knafelc
  • Department of Geology, Southern Illinois University, 1259 Lincoln Drive, Carbondale, Illinois 62901, U.S.A.
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/ Justin Filiberto
  • Department of Geology, Southern Illinois University, 1259 Lincoln Drive, Carbondale, Illinois 62901, U.S.A.
  • Lunar and Planetary Institute, USRA, 3600 Bay Area Boulevard, Houston, Texas 77058, U.S.A.
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/ Eric C. Ferré
  • Department of Geology, Southern Illinois University, 1259 Lincoln Drive, Carbondale, Illinois 62901, U.S.A.
  • School of Geosciences, University of Louisiana at Lafayette, Hamilton Hall, Room 323, 611 McKinley Street, Lafayette, Louisiana 70501, U.S.A.
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/ James A. Conder
  • Department of Geology, Southern Illinois University, 1259 Lincoln Drive, Carbondale, Illinois 62901, U.S.A.
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/ Lacey Costello
  • Department of Geology, Southern Illinois University, 1259 Lincoln Drive, Carbondale, Illinois 62901, U.S.A.
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/ Jake R. Crandall
  • Department of Geology, Southern Illinois University, 1259 Lincoln Drive, Carbondale, Illinois 62901, U.S.A.
  • Department of Geology and Geography, Eastern Illinois University, Physical Science Building, 600 Lincoln Avenue, Charleston, Illinois 61920, U.S.A.
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/ M. Darby Dyar
  • Department of Astronomy, Mount Holyoke College, 50 College Street, South Hadley, Massachusetts 01075, U.S.A.
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/ Sarah A. Friedman
  • Department of Geology, Southern Illinois University, 1259 Lincoln Drive, Carbondale, Illinois 62901, U.S.A.
  • Department of Biological & Physical Sciences, Montana State University Billings, 1500 University Drive, Billings, Montana 59101, U.S.A.
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/ Daniel R. Hummer
  • Department of Geology, Southern Illinois University, 1259 Lincoln Drive, Carbondale, Illinois 62901, U.S.A.
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/ Susanne P. Schwenzer
  • School of Environment, Earth, and Ecosystem Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, U.K.
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Published Online: 2019-04-26 | DOI: https://doi.org/10.2138/am-2019-6829

Abstract

Although nucleation of magnetite and/or hematite along dislocations upon oxidation of olivine has been observed by many workers, the effect of oxidation on the magnetic properties of the sample with specific mineralogical alterations has not been studied. Therefore, we investigate this problem using a set of time series 1 bar oxidation experiments at 600 and 900 °C. Results show rapid olivine oxidation and alteration at both 600 and 900 °C, forming magnetite and hematite associated with a change from paramagnetic to ferromagnetic behavior after oxidation. Magnetite and hematite nucleate along dislocations and impurities in the crystal structure, along with surface coatings and within cracks in the crystals.

Fresh, unaltered mantle xenoliths containing magnetite have been interpreted as having formed in cold tectonic regimes in the mantle, rather than through oxidation during or after ascent. Mantle xenoliths rapidly ascend through the mantle with estimates of the ascent of up to 90 km/h (3 GPa/h) based on the diffusion profile of water in mantle olivine. The rates correspond to xenoliths ascending through the mantle over hours and not days or weeks. Our results show that olivine oxidation and alteration can occur in days to weeks at 600 °C and within minutes at 900 °C. Therefore, if the xenolithic material is transported to the surface in a cold magma (at temperatures ≤600 °C), then the timescale of ascent is likely not long enough for oxidation to cause magnetite formation or a ferromagnetic signature to occur. However, if the material is transported in a hot oxidized basaltic magma (with temperatures ≥900 °C), then oxidation can cause magnetite formation and a ferromagnetic signature.

Keywords: Olivine; oxidation; hematite; magnetite; magnetic properties; xenoliths

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About the article

Received: 2018-09-27

Accepted: 2019-01-09

Published Online: 2019-04-26

Published in Print: 2019-05-27


Citation Information: American Mineralogist, Volume 104, Issue 5, Pages 694–702, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2019-6829.

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