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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy
(S) - IASPEI - International Association of Seismology and Physics of the Earth's
Interior
JSS001 Poster presentation 1730
Analysis of P-V-T relationship and melting of the pyrope mineral
Dr. Kripa Shanker Singh
physics R.B.S.COLLEGE,AGRA,INDIA(AFFL.-DR.B.R.A. UNIV. ) IASPEI
ABSTRACT The melting behaviour of any solid under extreme conditions has attracted the attention of
theoretical and experimental workers [Wang et al, Journal of alloys and Compounds 31 (2001) 51].
Knowledge of the volume properties of minerals at simultaneously high temperatures and pressures is
needed for quantitative understanding of the Earth's deep interior [Fiquet et.al, Phys. Chem. Minerals 27
(1999) 103]. Pyrope (Mg3Al2Si3O12) is an important geophysical mineral present in Earth's interior.
Thermoelastic and physical properties of this mineral are of considerable interest and importance to
both material scientists and geophysicists alike. Thermoelastic and thermodynamic properties including
bulk mondulus and its variation with temperature and pressure, and melting of this mineral are of
central importance for understanding the behaviour at temperature and pressure conditions relevant to
Earth's interior [O.L. Anderson, Equations of State of Solids for Geophysics and Ceramic Sciences,
Shanker et.al, Physica B 245 (2001) 190]. Studies on melting assume significance in view of the fact
that it covers the widest range of pressures and temperatures [Wang et al, Physica B 293 (2001) 408].
The pressure-volume-temperature relationship have been studied for the pyrope mineral. Values of
volumes at simultaneously elevated temperatures and pressures have been evaluated using the
Rydberg - Vinet [Phys. Rev. B 35 (1987)] 1945, J.Phys.Condens. Matter 1 (1989) 1941] equation of
state for isothermal compression and the Singh - Suzuki [Singh, High Temp. - High Pressure 34 (2002)
379] equation for isobaric thermal expansion. Values of volumes at melting temperatures corresponding
to elevated pressures have been obtained and found to compare well with the experimental values.
Keywords: pyrope mineral, melting, equation of state