Jump to ContentJump to Main Navigation
Show Summary Details
More options …

American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
Source Normalized Impact per Paper (SNIP) 2017: 1.059

Online
ISSN
1945-3027
See all formats and pricing
More options …
Volume 101, Issue 1

Issues

A spin on lower mantle mineralogy

Jeffrey S. Pigott
  • Corresponding author
  • Department of Earth, Environmental, and Planetary Sciences, Case Western Reserve University, Cleveland, Ohio, 44106, U.S.A.
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2016-01-09 | DOI: https://doi.org/10.2138/am-2016-5497

Abstract

Constraining the spin state of Fe in Earth's lower mantle is critical to understanding the chemistry and dynamics of Earth's interior. In the October 2015 issue of American Mineralogist, Dorfman et al. present an experimental study of the effect of iron concentration on the spin transition in bridgmanite. Their experiments involved two different bridgmanite compositions (38 and 74% FeSiO3). Based on the total spin moment determined by synchrotron-based X-ray emission spectroscopy, they show that Fe2+ in bridgmanite is in the high-spin state in the lower mantle but transition pressure decreases within highly enriched iron concentrations.

Keywords: Iron; spin transition; bridgmanite; high pressure

References cited

  • Antonangeli, D., Siebert, J., Aracne, C.M., Farber, D.L., Bosak, A., Hoesch, M., Krisch, M., Ryerson, F.J., Fiquet, G., and Badro, J. (2011) Spin crossover in ferropericlase at high pressure: A seismologically transparent transition? Science, 331, 64–67.Google Scholar

  • Badro, J. (2014) Spin transitions in mantle minerals. Annual Review of Earth and Planetary Sciences, 42, 231–248.Google Scholar

  • Badro, J., Fiquet, G., Guyot, F., Rueff, J.-P., Struzhkin, V.V., Vankó, G., and Monaco, G. (2003) Iron partitioning in Earth's mantle: Toward a deep lower mantle discontinuity. Science, 300, 789–791.Google Scholar

  • Badro, J., Rueff, J.-P., Vankó, G., Monaco, G., Fiquet, G., and Guyot, F. (2004) Electronic transitions in perovskite: Possible nonconvecting layers in the lower mantle. Science, 305, 383–386.Google Scholar

  • Chen, B., Jackson, J.M., Sturhahn, W., Zhang, D., Zhao, J., Wicks, J.K., and Murphy, C.A. (2012) Spin crossover equation of state and sound velocities of (Mg0.65Fe0.35)O ferropericlase to 140 GPa. Journal of Geophysical Research, 117, B08208.Google Scholar

  • Dorfman, S.M., Badro, J., Rueff, J.-P., Chow, P., Xiao, Y., and Gillet, P. (2015) Composition dependence of spin transition in (Mg,Fe)SiO3 bridgmanite. American Mineralogist, 100, 2248–2255.Google Scholar

  • Fujino, K., Nishio-Hamane, D., Nagai, T., Seto, Y., Kuwayama, Y., Whitaker, M., Ohfuji, H., Shinmei, T., and Irifune, T. (2014) Spin transition, substitution, and partitioning of iron in lower mantle minerals. Physics of the Earth and Planetary Interiors, 228, 186–191.Google Scholar

  • Fyfe, W.S. (1960) The possibility of d-electron coupling in olivine at high pressures. Geochimica et Cosmochimica Acta, 19, 141–143.Google Scholar

  • Irifune, T., Shinmei, T., McCammon, C.A., Miyajima, N., Rubie, D.C., and Frost, D.J. (2010) Iron partitioning and density changes of pyrolite in Earth's lower mantle. Science, 327, 193–195.Google Scholar

  • Keppler, H., Kantor, I., and Dubrovinsky, L.S. (2007) Optical absorption spectra of ferropericlase to 84 GPa. American Mineralogist, 92, 433–436.Google Scholar

  • Lin, J.-F., Weir, S.T., Jackson, D.D., Evans, W.J., Vohra, Y.K., Qiu, W., and Yoo, C.-S. (2007) Electrical conductivity of the lower-mantle ferropericlase across the electronic spin transition. Geophysical Research Letters, 34, L16305.Google Scholar

  • Lin, J.-F., Speziale, S., Mao, Z., and Marquardt, H. (2013) Effects of the electronic spin transitions of iron in lower mantle minerals: Implications for deep mantle geophysics and geochemistry. Reviews of Geophysics, 51, 244–275.Google Scholar

About the article

Received: 2015-07-13

Accepted: 2015-07-22

Published Online: 2016-01-09

Published in Print: 2016-01-01


Manuscript handled by Keith Putirka.


Citation Information: American Mineralogist, Volume 101, Issue 1, Pages 1–2, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2016-5497.

Export Citation

© 2016 by Walter de Gruyter Berlin/Boston.

Comments (0)

Please log in or register to comment.
Log in