Al2O3 solubility in orthopyroxene in the system MgO - Al2O3 - SiO2

a re-evaluation, and mantle geotherm.

D. L. Lane, Jibamitra Ganguly

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58 Citations (Scopus)

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: Space Physics
Volume85
StatePublished - 1980
Externally publishedYes

Fingerprint

peridotite
Garnets
orthopyroxene
garnets
garnet
Earth mantle
solubility
Solubility
mantle
pyrope
Aluminum Oxide
evaluation
nodules
lherzolite
P-T conditions
spinel
aluminum oxide
aluminum oxides
slopes
spinell

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

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title = "Al2O3 solubility in orthopyroxene in the system MgO - Al2O3 - SiO2: a re-evaluation, and mantle geotherm.",
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.",
author = "Lane, {D. L.} and Jibamitra Ganguly",
year = "1980",
language = "English (US)",
volume = "85",
pages = "6963--6972",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9380",
publisher = "Wiley-Blackwell",

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T1 - Al2O3 solubility in orthopyroxene in the system MgO - Al2O3 - SiO2

T2 - a re-evaluation, and mantle geotherm.

AU - Lane, D. L.

AU - Ganguly, Jibamitra

PY - 1980

Y1 - 1980

N2 - 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.

AB - 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.

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