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Equations of state of Plagioclase Feldspars

Authors:

Email author" target="_blank">R?J?Angel Email author

Institution:

(1) Crystallography Laboratory, Dept. GeoSciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24060, USA

Abstract:

The volume variation with pressure of seven intermediate plagioclase feldspars has been determined by high-pressure single-crystal X-ray diffraction. The bulk moduli of plagioclases for a 3rd-order Birch-Murnaghan EoS can be described by the following pair of equations:

$K_{{T0}} = 54.1{\left( 3 \right)} + 0.39{\left( 1 \right)}X_{{An}} {\text{ for }}X_{{An}} < {\text{50}}$

$K_{{T0}} = 59.5{\left( {3.1} \right)} + 0.23{\left( 4 \right)}X_{{An}} {\text{ for }}X_{{An}} > {\text{50}}$

with ${K}'_{0} = 5.8$ for plagioclase with X _An<20 and ${K}'_{0} = 3.2$ for X _An>35. These parameters can also be used in a Murnaghan EoS to describe the volume variation of plagioclase feldspars up to pressures of 3 GPa. For a Murnaghan EoS with ${K}'_{0} = 4$ , the values of the bulk moduli can be described by a single equation, $K_{{T0}} = 57.7{\left( 6 \right)} + 0.24{\left( 1 \right)}X_{{An}}$ , with a small loss in the accuracy of the predicted volumes up to pressures of 3 GPa.Editorial responsibility: T.L. GroveAn erratum to this article can be found at

Keywords:

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