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- W2266723618 abstract "The authors present the results of direct calorimetric determinations of the heat of mixing of NaAlSi/sub 3/O/sub 8/ and H/sub 2/O to form hydrous melts and glasses. ..delta..H is small and exothermic throughout the P-T range investigated. At 298 K and 1 bar there is a minimum in ..delta..H (-2.39 kcal/mole at X/sub w//sup m/ approx. = 0.27). Results of high-pressure drop calorimetry on hydrous albite melts show that ..delta..H becomes more endothermic as T increases. The minimum in ..delta..H as a function of X/sub w//sup m/ occurs in the compositional region where OH/sup -/ is the dominant hydrogen-bearing species in the glass. The average partial molal heat capacity of H/sub 2/O in hydrous albite melt (from 298 to 1306 K, 20 cal/mole/K) is similar to that of pure liquid water at ambient conditions. Reconnaissance studies in the system 4Q-Ab-Or-H/sub 2/O indicate a general similarity with the Ab-H/sub 2/O system in that ..delta..H is small and exothermic. In detail, however, Ab-H/sub 2/O provides neither a quantitative nor a qualitative model for the more complex haplogranite melts. At 298 K, ..delta..H for the studied haplogranite composition is at a minimum of -0.75 kcal/mole at X/sub w//sup m/ approx. = 0.5. Theirmore » results help to explain geological phenomena such as the high water contents of perlitic obsidians and the lack of thermal magma quenching accompanying exsolution of dissolved water in explosive volcanic eruptions.« less" @default.
- W2266723618 created "2016-06-24" @default.
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- W2266723618 date "1987-03-01" @default.
- W2266723618 modified "2023-09-27" @default.
- W2266723618 title "Mixing properties of NaAlSi/sub 3/O/sub 8/ melt-H/sub 2/O: new calorimetric data and some geological implications" @default.
- W2266723618 hasPublicationYear "1987" @default.
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