Abstract
Anorthositic plagioclase (An50) with a low-transitional or low structural state converts to a high-transitional or high structural state during triaxial compression experiments at temperatures from 800° C to 1200° C and confining pressures between 5–17 kb during 30 to 45 min tests. The amount of converted plagioclase increases with increasing temperature from 800° C to 1 200° C. Structural conversion is most pronounced in the central portion of anorthosite cores, where temperature is highest, and decreases outward in either direction towards the cooler ends of cores. Alteration of plagioclase during testing implies that water is present to facilitate the structural conversion. Microprobe analysis indicates that no chemical rearrangement has occurred during the structural conversion.
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