Mathematics – Logic
Scientific paper
Sep 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968gecoa..32..999b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 32, Issue 9, pp.999-1012
Mathematics
Logic
11
Scientific paper
The reactions nepheline + high albite Jadeite and high albite Jadeite + quartz were measured in the presence of high-pressure vapors and silicate melts in the system NaAlSiO 4 -SiO 2 -H 2 O for the temperature range 600-800°C. Kinetics were such that complete reaction was attained in most runs. The results of these determinations together with previous studies in this system and recent thermochemical data collectively place narrow restrictions on the positions of the above reactions over a wide temperature range. An entropy change of 3.5 eu accompanying the transformation of low to high albite is in good agreement with these results. Some data are also provided for the reaction analcite + high albite Jadeite + vapor. It is concluded that Jadeite can form in a variety of geologic environments at pressures lower than previously determined.
Boettcher Arthur L.
Wyllie Peter J.
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