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

D. L. Lane; J. Ganguly

doi:10.1029/jb085ib12p06963

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 language	English (US)
Pages (from-to)	6963-6972
Number of pages	10
Journal	Journal of geophysical research
Volume	85
DOIs	https://doi.org/10.1029/jb085ib12p06963
State	Published - 1980
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Physical and Theoretical Chemistry
Polymers and Plastics
Materials Chemistry

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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.",

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year = "1980",

doi = "10.1029/jb085ib12p06963",

language = "English (US)",

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pages = "6963--6972",

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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, J.

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

Abstract

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