Computer Science
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..73..407f&link_type=abstract
Earth and Planetary Science Letters, Volume 73, Issue 2-4, p. 407-414.
Computer Science
22
Scientific paper
The heat of fusion of haplobasaltic liquids in the systems forsterite-diopside-SiO2 and basaltic liquids in natural peridotite has been determined by high-temperature solution calorimetry. For liquids in the systems diopside-anorthite and forsterite-diopside-anorthite the heat of fusion was calculated from literature data. The heats of fusion for eutectic liquids in the system anorthite-diopside and forsterite-diopside-anorthite, for haplobasaltic liquid in equilibrium with olivine and two pyroxenes in the system forsterite-diopside-SiO2 and for basaltic melts from natural peridotite parent, are 130.6, 121.1, 157.4 and 161.5 cal/g, respectively. The heat of mixing in the liquids contributes up to about 5% of this value. The magnitude of this contribution increases when the structure of the endmember minerals is significantly different (e.g., forsterite and anorthite or quartz).
The pressure effect on the heat of fusion results in a 10-20% increase in the pressure range 10-30 kbar compared with the 1-atm values. This increase results from the larger compressibility of silicate liquids compared with that of the coexisting minerals in both model and natural compositions.
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