Activity–composition relations for the calculation of partial melting equilibria in metabasic rocks

  • E. C. R. Green
    Institute of Geochemistry and Petrology ETH Zurich Clausiusstrasse 25 8092 Zurich Switzerland
  • R. W. White
    Institute of Geosciences Johannes Gutenberg University of Mainz 55128 Mainz Germany
  • J. F. A. Diener
    Department of Geological Sciences University of Cape Town Rondebosch 7701 South Africa
  • R. Powell
    School of Earth Sciences University of Melbourne Victoria 3010 Australia
  • T. J. B. Holland
    Department of Earth Sciences University of Cambridge Cambridge CB2 3EQ UK
  • R. M. Palin
    Institute of Geosciences Johannes Gutenberg University of Mainz 55128 Mainz Germany

抄録

<jats:title>Abstract</jats:title><jats:p>A set of thermodynamic models is presented that, for the first time, allows partial melting equilibria to be calculated for metabasic rocks. The models consist of new activity–composition relations combined with end‐member thermodynamic properties from the Holland & Powell dataset, version 6. They allow for forward modelling in the system Na<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jmg12211-math-0001.png" xlink:title="urn:x-wiley:02634929:media:jmg12211:jmg12211-math-0001" />O–CaO–K<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jmg12211-math-0002.png" xlink:title="urn:x-wiley:02634929:media:jmg12211:jmg12211-math-0002" />O–FeO–MgO–Al<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jmg12211-math-0003.png" xlink:title="urn:x-wiley:02634929:media:jmg12211:jmg12211-math-0003" />O<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jmg12211-math-0004.png" xlink:title="urn:x-wiley:02634929:media:jmg12211:jmg12211-math-0004" />–SiO<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jmg12211-math-0005.png" xlink:title="urn:x-wiley:02634929:media:jmg12211:jmg12211-math-0005" />–H<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jmg12211-math-0006.png" xlink:title="urn:x-wiley:02634929:media:jmg12211:jmg12211-math-0006" />O–TiO<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jmg12211-math-0007.png" xlink:title="urn:x-wiley:02634929:media:jmg12211:jmg12211-math-0007" />–Fe<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jmg12211-math-0008.png" xlink:title="urn:x-wiley:02634929:media:jmg12211:jmg12211-math-0008" />O<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jmg12211-math-0009.png" xlink:title="urn:x-wiley:02634929:media:jmg12211:jmg12211-math-0009" />. In particular, new activity–composition relations are presented for silicate melt of broadly trondhjemitic–tonalitic composition, and for augitic clinopyroxene with Si–Al mixing on the tetrahedral sites, while existing activity–composition relations for hornblende are extended to include K<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jmg12211-math-0010.png" xlink:title="urn:x-wiley:02634929:media:jmg12211:jmg12211-math-0010" />O and TiO<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jmg12211-math-0011.png" xlink:title="urn:x-wiley:02634929:media:jmg12211:jmg12211-math-0011" />. Calibration of the activity–composition relations was carried out with the aim of reproducing major experimental phase‐in/phase‐out boundaries that define the amphibolite–granulite transition, across a range of bulk compositions, at ≤13 kbar.</jats:p>

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