New mineral activity-composition relations for thermodynamic calculations in metapelitic systems

RW White; R Powell; TJB Holland; TE Johnson; ECR Green

Journal article

New mineral activity-composition relations for thermodynamic calculations in metapelitic systems

RW White, R Powell, TJB Holland, TE Johnson, ECR Green

Journal of Metamorphic Geology | Published : 2014

DOI: 10.1111/jmg.12071

Abstract

New activity-composition (a-x) relations for minerals commonly occurring in metapelites are presented for use with the internally consistent thermodynamic dataset of Holland & Powell (, Journal of Metamorphic Geology, 29, 333-383). The a-x relations include a broader consideration of Fe2O3 in minerals, changes to the formalism of several phases and order-disorder in all ferromagnesian minerals where Fe-Mg mixing occurs on multiple sites. The a-x relations for chlorite, biotite, garnet, chloritoid, staurolite, cordierite, orthopyroxene, muscovite, paragonite and margarite have been substantially reparameterized using the approach outlined in the companion paper in this issue. For the first ti..

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University of Melbourne Researchers

Roger Powell Author

Eleanor Green Author

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Grants

Funding Acknowledgements

RP acknowledges support from Australian Research Council grants DP0451770, DP0557013 and DP098 7731. We thank J. Diener, D. Pattison, M. Brown and the late N. Hudson for numerous fruitful discussions on metapelitic equilibria. M. Caddick, L. Tajcmanova and D. Waters are thanked for helpful reviews and M. Brown for his editorial handling and suggestions. C. Diel and R. Weil are thanked for assistance with the calculations.