An experimental study of the partitioning of Fe and Mg between garnet and orthopyroxene View Full Text


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Article Info

DATE

1984-12

AUTHORS

Simon L. Harley

ABSTRACT

The partitioning of Fe and Mg between garnet and aluminous orthopyroxene has been experimentally investigated in the pressure-temperature range 5–30 kbar and 800–1,200° C in the FeO-MgO-Al2O3-SiO2 (FMAS) and CaO-FeO-MgO-Al2O3-SiO2 (CFMAS) systems. Within the errors of the experimental data, orthopyroxene can be regarded as macroscopically ideal. The effects of Calcium on Fe-Mg partitioning between garnet and orthopyroxene can be attributed to non-ideal Ca-Mg interactions in the garnet, described by the interaction term:WCaMgga-WCaFega=1,400±500 cal/mol site.Reduction of the experimental data, combined with molar volume data for the end-member phases, permits the calibration of a geothermometer which is applicable to garnet peridotites and granulites:\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$T(^\circ C) = \left\{ {\frac{{3,740 + 1,400X_{gr}^{ga} + 22.86P(kb)}}{{R\ln K_D + 1.96}}} \right\} - 273$$ \end{document} with\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$K_D = {{\left\{ {\frac{{Fe}}{{Mg}}} \right\}^{ga} } \mathord{\left/ {\vphantom {{\left\{ {\frac{{Fe}}{{Mg}}} \right\}^{ga} } {\left\{ {\frac{{Fe}}{{Mg}}} \right\}}}} \right. \kern-\nulldelimiterspace} {\left\{ {\frac{{Fe}}{{Mg}}} \right\}}}$$ \end{document} and\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$X_{gr}^{ga} = (Ca/Ca + Mg + Fe)^{ga} .$$ \end{document}The accuracy and precision of this geothermometer are limited by largerelative errors in the experimental and natural-rock data and by the modest absolute variation inKD with temperature. Nevertheless, the geothermometer is shown to yield reasonable temperature estimates for a variety of natural samples. More... »

PAGES

359-373

References to SciGraph publications

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  • 1982-12. Garnet–orthopyroxene barometry for granulites and peridotites in NATURE
  • 1979-03. An experimental study of Fe-Mg partitioning between garnet and olivine and its calibration as a geothermometer in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1977-01. Pyroxene thermometry in simple and complex systems in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1977-01. Dry granulite mineral assemblages in the contact aureoles of the Nain complex, Labrador in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1969-02. Granulitic and eclogitic inclusions from basic pipes at Delegate, Australia in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1973-06. Experimental study of the stability of cordierite and garnet in pelitic compositions at high pressures and temperatures in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1973. Thermodynamics of Rock-Forming Crystalline Solutions in NONE
  • 1980-12. Geothermometry of garnet lherzolite nodules with special reference to those from the kimberlites of Northern Lesotho in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1979-11. An experimental study of the effect of Ca upon garnet-clinopyroxene Fe-Mg exchange equilibria in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1974-06. The energetics of natural garnet solid solution in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1978-04. Experimental calibration of the partitioning of Fe and Mg between biotite and garnet in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1972-03. Petrogenesis of eclogites in high grade metamorphic gneisses, exemplified by the Hareidland eclogite, western Norway in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1980-01. Some constraints on the thermodynamic mixing properties of Fe-Mg orthopyroxenes and olivines in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1974-06. Study on the compositional dependence of the apparent partition coefficient of iron and magnesium between coexisting garnet and clinopyroxene solid solution in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
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