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A thermochemical calculation of the pyroxene saturation surface in the system diopside-albite-anorthiteThe pyroxene saturation surface in the system diopside-albite-anorthite may be calculated to + or - 10 C from thermochemical data over most of its composition range. The thermochemical data used are the experimentally determined enthalpies of mixing of the ternary liquids and the enthalpy of fusion of diopside. These are combined with a mixing model for the configurational entropy in the melt and the activity of CaMgSi2O6 in the clinopyroxene, which is less than unity due to departures from CaMgSi2O6 stoichiometry. The two-lattice melt model appears to work satisfactorily throughout the pyroxene primary phase field but probably needs modification at more anorthite-rich compositions.
Document ID
19810038117
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hon, R.
(Boston College Chestnut Hill, Mass., United States)
Henry, D. J.
(Boston Coll. Chestnut Hill, MA, United States)
Navrotsky, A.
(Arizona State University Tempe, Ariz., United States)
Weill, D. F.
(Oregon, University Eugene, Ore., United States)
Date Acquired
August 11, 2013
Publication Date
February 1, 1981
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 45
Subject Category
Geophysics
Accession Number
81A22521
Funding Number(s)
CONTRACT_GRANT: NSF DMR-78-10038
CONTRACT_GRANT: NGL-38-003-020
Distribution Limits
Public
Copyright
Other

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