Al2O3 solubility in orthopyroxene in the system MgO - Al2O3 - SiO2: a re-evaluation, and mantle geotherm.

D. L. Lane, J. Ganguly

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Abstract

The solubility of Al2O3 in orthopyroxene coexisting with pyrope has been determined approaching the systems from high and low alumina contents, from 26 to 39 kbar and at 960o to over 1200oC, for durations of 8 to several hundred hours. The dT/dP slopes for Al content are positive and steeper in the garnet-peridotite field than in the spinel-peridotite, and the wt.% Al2O3 rises smoothly to 10 at the boundary between these fields at approx 1300oC and 25 kbar. The univariant boundary is moderately convex towards the T axis with a P minimum at 19 kbar and 840oC. The sheared garnet-lherzolite nodules in kimberlites do appear to have formed at higher P-T conditions than the granular ones.M.J.Le B.

Original languageEnglish (US)
Pages (from-to)6963-6972
Number of pages10
JournalJournal of Geophysical Research
Volume85
StatePublished - Jan 1 1980

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ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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