Calorimetric investigation of the excess entropy of mixing in analbite-sanidine solid solutions: lack of evidence for Na,K short- range order and implications for two-feldspar thermometry.
Heat capacities (5-380 K) have been measured by adiabatic calorimetry for five highly disordered alkali feldspars (Ab99Or1, Ab85Or15, Ab55Or45, Ab25Or75 and Ab1Or99). The thermodynamic and mineralogical implications of the results are discussed. The new data are also combined with recent data for plagioclases in order to derive a revised expression for the two-feldspar thermometer. T calculated from the revised expression tend to be higher than previous calculations.-J.A.Z.
Citation Information
Publication Year | 1983 |
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Title | Calorimetric investigation of the excess entropy of mixing in analbite-sanidine solid solutions: lack of evidence for Na,K short- range order and implications for two-feldspar thermometry. |
Authors | H.T. Haselton, G.L. Hovis, B. S. Hemingway, R. A. Robie |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | American Mineralogist |
Index ID | 70011227 |
Record Source | USGS Publications Warehouse |