Nepal Geological Society (NGS): Nepal National Group of IAEG and a leading organization in geosciences

Nepal Geological Society (NGS): Nepal National Group of IAEG and a leading organization in geosciences

GEOTHERMOBAROMETER BASED ON COEXISTING GARNET-ORTHOPYROXENE-PLAGIOCLASE-QUARTZ EQUILIBRIA

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

Harel Thomas

Department of Applied Geology, Dr. H. S. G. University, Sagar (MP), India

Lalu P. Paudel

Central Department of Geology, Tribhuvan University, Kirtipur, Kathmandu, Nepal

Jour. Nepal Geol. Soc., Vol. 51, 2016, 1-10

 

Abstract

The garnet-orthopyroxene-plagiolcase-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

Leave a Reply

Your email address will not be published. Required fields are marked *

Upcoming Events
  1. EGU Galileo Conference, 13-19 October 2018

    October 13, 2019 - October 19, 2019
Recent Comments