Other
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..611r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Issue 4, pp.611-624
Other
18
Scientific paper
Phase equilibria data in the systems SiO 2 -P 2 O 5 , P 2 O 5 -M x O y , and P 2 O 5 -M x O y -SiO 2 are employed in conjunction with Chromatographic and spectral data to investigate the role of P 2 O 5 in silicate melts. Such data indicate that the behavior of P 2 O 5 is complex. P 2 O 5 depolymerizes pure SiO 2 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. The effect of this polymerization is apparent in the widening of the granite-ferrobasalt two-liquid solvus. In this complex system P 2 O 5 acts to increase phase separation by further enrichment of the high charge density cations Ti, Fe, Mg, Mn, Ca, in the ferrobasaltic liquid. P 2 O 5 also produces an increase in the ferrobasalt-granite REE liquid distribution coefficients. These distribution coefficients are close to 4 in P 2 O 5 -free melts, but close to 15 in P 2 O 5 -bearing melts. The dual behavior of P 2 O 5 is explained in a model which requires complexing of phosphate anions (analogous to silicate 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 P 2 O 5 into the ferrobasaltic liquid.
Hess Paul C.
Ryerson Frederick J.
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