Anorthite,andesine, wollastonite,diopside, cordierite and pyrope: thermodynamics of melting,glass transitions,and properties of the amorphous phases |
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| Authors: | Pascal Richet Yan Bottinga |
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| Institution: | 1. Laboratoire de Géochimie et Cosmochimie, Institut de Physique du Globe, 75251 Paris Cédex 05 France;2. Universitéde Nice, Parc Valrose, 06034 Nice France |
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| Abstract: | Drop calorimetry measurements between 900 and 1850 K are reported for amorphous anorthite, andesine, wollastonite, diopside, cordierite and pyrope. The isobaric heat capacities of the glassy and liquid phases of these materials, and the enthalpies of fusion of the minerals have been derived. The calorimetric entropies of fusion of these substances and of other oxide minerals are generally consistent with the calculated volume changes on melting and with the observed pressure dependences of the melting points. The thermodynamics of mixing of liquid plagioclases have been examined, and it is concluded that their enthalpies of mixing are markedly different from the values derived directly from solution calorimetry measurements at 985 K. |
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