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A reconnaissance of trace elements in anorthoclase megacrysts

Published online by Cambridge University Press:  05 July 2018

R. A. Mason ,
J. V. Smith ,
J. B. Dawson  and
S. B. Treves
R. A. Mason
Affiliation:
Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois USA 60637
J. V. Smith
Affiliation:
Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois USA 60637
J. B. Dawson
Affiliation:
Department of Geology, University of Sheffield, Sheffield, S1 3JD
S. B. Treves
Affiliation:
Department of Geology, University of Nebraska, Lincoln, Nebraska USA 68508
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Abstract

Major, minor, and trace elements were measured with electron and ion microprobes for eighteen anorthoclase megacrysts from five locations. Comparisons with concentration ranges tabulated by Smith (1974) show excellent agreement except for consistently lower values of Mg and B. The discrepancy for Mg probably reflects Mg-rich impurities contaminating samples analysed by bulk methods. The cause of the discrepancy for B is unknown and deserves further study. Samples from Mt. Erebus, Antarctica, contain glass inclusions from which the following crystal/liquid partition coefficients ensue: Mg, 0.008; P, 0.04; Ti, 0.08; Fe, 0.04; Ba, 5.2; Sr, 8; Rb, 0.27.

Type
Research Article
Information
Mineralogical Magazine , Volume 46 , Issue 338 , March 1982 , pp. 7 - 11
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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