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The role of P2O5 in silicate meltsPhase equilibria data in the systems SiO2-P2O5, P2O5-M(x)O(y), and P2O5-M(x)O(y)-SiO2 are employed in conjunction with chromatographic and spectral data to investigate the role of P2O5 in silicate melts. P2O5 depolymerizes pure SiO2 melts by entering the network as a four-fold coordinated cation, but polymerizes melts in which an additional metal cation other than silicon is present. In this complex system P2O5 acts to increase phase separation by further enrichment of the high charge density cations Ti, Fe, Mg, Mn, Ca, in the ferrobasaltic liquid. The dual behavior of P2O5 is explained in a model which requires complexing of phosphate anions and metal cations in the melt. This interaction destroys Si-O-M-O-Si bonds polymerizing the melt. The higher concentration of Si-O-M-O-Si bond complexes in immiscible ferrobasaltic liquids relative to their conjugate immiscible granite liquids explains the partitioning of P2O5 into the ferrobasaltic liquid.
Document ID
19800044383
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ryerson, F. J.
(Carnegie Institution of Washington Washington, D.C., United States)
Hess, P. C.
(Brown University Providence, R.I., United States)
Date Acquired
August 10, 2013
Publication Date
April 1, 1980
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 44
Subject Category
Chemistry And Materials (General)
Accession Number
80A28553
Funding Number(s)
CONTRACT_GRANT: NGR-40-002-123
CONTRACT_GRANT: NSF EAR-74-13378
CONTRACT_GRANT: NSF EAR-77-13498
Distribution Limits
Public
Copyright
Other

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