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American Mineralogist

Journal of Earth and Planetary Materials

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


IMPACT FACTOR 2018: 2.631

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

Online
ISSN
1945-3027
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Volume 86, Issue 10

Issues

Calcium segregation at antiphase boundaries in pigeonite

Kevin T. Moore / David R. Veblen
  • Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, U.S.A.
  • Other articles by this author:
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/ James M. Howe
  • Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22903, U.S.A.
  • Other articles by this author:
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Published Online: 2015-03-26 | DOI: https://doi.org/10.2138/am-2001-1021

Abstract

Over the past 30 years the cooling rates of terrestrial and extraterrestrial basaltic rocks have commonly been inferred from the size of antiphase domains (APDs) in pigeonite. However, the coarsening rate of APDs has been observed to deviate substantially from an ideal rate. It is believed that this deviation is caused by Ca segregation to the antiphase boundaries (APBs) of domains, since Ca is expected to substantially slow boundary migration rates due to solute drag.

This letter presents direct experimental evidence of Ca segregation to APBs in pigeonite. The local atomic structure and chemistry of APBs in pigeonite were examined using high-resolution and energy-filtered transmission electron microscopy. High-resolution images show that APBs in pigeonite have a structure similar to that of augite, and energy-filtered compositional images reveal that Ca segregates to APBs. These results have direct ramifications for the use of antiphase domain (APD) size as a marker for the thermal history of the rocks in which pigeonite crystallizes.

About the article

Received: 2001-05-08

Accepted: 2001-07-07

Published Online: 2015-03-26

Published in Print: 2001-10-01


Citation Information: American Mineralogist, Volume 86, Issue 10, Pages 1314–1318, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2001-1021.

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© 2015 by Walter de Gruyter Berlin/Boston.

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