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The solubility of olivine in basaltic liquids - An ionic modelA model is presented which enables the temperature at which olivine is in equilibrium with any alkali-depleted basaltic compound to be calculated to within + or - 30 C. It is noted that the error increases substantially when applied to terrestrial basalts which contain several weight percent alkalis. In addition the model predicts and quantifies the reduced activity of SiO4(4-) monomers due to increasing SiO2 concentrations in the melt. It is shown that the coordination of alumina in melts which precipitate olivine only appears to be dominantly octahedral, while titanium acts as a polmerizing agent by interconnecting previously isolated SiO4(4-) monomers. It is concluded that the model is sufficiently sensitive to show that there are small repulsive forces between Mg(2+) and calcium ions which are in association with normative diopside in the melt.
Document ID
19790063561
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Herzberg, C. T.
(Harvard-Smithsonian Center for Astrophysics Cambridge, Mass., United States)
Date Acquired
August 9, 2013
Publication Date
August 1, 1979
Publication Information
Publication: Geochimica and Cosmochimica Acta
Volume: 43
Subject Category
Inorganic And Physical Chemistry
Accession Number
79A47574
Funding Number(s)
CONTRACT_GRANT: NGL-09-015-150
Distribution Limits
Public
Copyright
Other

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