Geothermobarometer based on coexisting garnet-orthopyroxene-plagioclase-quartz equilibria

  • Harel Thomas Department of Applied Geology
  • Lalu P. Paudel Central Department of Geology, Tribhuvan University, Kirtipur, Kathmandu
Keywords: Exchange reaction, Net transfer reaction, Geothermobarometer, Granulite

Abstract

The garnet-orthopyroxene-plagolcase-quartz pairs are commonly found in the assemblages of basic granulites/charnockite and hence are suitable for estimating equilibrium temperature and pressure of most metamorphic rocks. The temperature based on garnet-orthopyroxene Fe-Mg exchange reaction and pressure based on net transfer reaction of garnet-orthopyroxeneplagioclase- quartz equilibria, mainly based on reactions, using the equation given by different workers.
i. 1/2 Ferrosilite + 1/3 Pyrope = 1/2 Enstatite + 1/3 Almandine.
ii. Ferrosilite + Anorthite = 2/3 Almandine + 1/3 Grossularite + Quartz
iii. Enstatite + Anorthite = 2/3 Pyrope + 1/3 Grossularite + Quartz.
The author developed software in visual basic with the executable code MPET3.EXE

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Abstract
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Published
2016-12-31
How to Cite
Thomas, H., & Paudel, L. (2016). Geothermobarometer based on coexisting garnet-orthopyroxene-plagioclase-quartz equilibria. Journal of Nepal Geological Society, 51, 1-9. https://doi.org/10.3126/jngs.v51i0.24083
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Articles