Synthesis fields of some aluminium silicates--Further studies

Details Synthesis fields of some aluminium silicates--Further studies Synthesis fields of some aluminium silicates--Further studies

Feb 1963

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963gecoa..27..133c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 27, Issue 2, pp.133-135

Mathematics

Logic

5

Scientific paper

Further synthesis of some aluminium silicates from similar starting materials (CARR and Fyfe, 1960) but with sealed samples not only confirms the proposition that the P-T field in which a phase or assemblage of phases may be synthesized need not be identical with that in which it is stable, but also illustrates the importance of choice of experimental method for those laboratory studies designed to clarify petrological data. Enclosure of reactants in sealed tubes rather than in pinched tubes causes significant changes in the position and extent of the pyrophyllite and X-andalusite syntheses fields. At 30,000 lb/in 2 using amorphous silica-kaolinite the pyrophyllite synthesis field expands from a breadth of 190° to 230°C and for quartz-kaolinite the field doubles in size (50° to 100°C). On the other hand the field of X-andalusite is reduced in extent from a breadth of 55° to 20°C. Synthesis studies in the system Al 2 O 3 --(6-8) SiO 2 --O.05K 2 O indicate catalysis of the nucleation of X-andalusite.

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