Abstract
The experimentally determined equilibrium curves for the subsolidus olivineplagioclase reaction fall into two groups: those with positive slopes (dP/dT) that suggest reaction during cooling, and those with zero slopes that imply reaction by increase of pressure. Corona structures were developed in the mafic cumulates of northern Norway at different times during Caledonian almandine amphibolite facies metamorphism, as individual intrusions cooled from solidus temperatures. Unless pressure increases coincided fortuitously with subsolidus cooling, these relationships suggest that the positive-slope models are most analogous to natural systems.
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Gardner, P.M., Robins, B. The olivine-plagioclase reaction: Geological evidence from the seiland petrographic province, northern Norway. Contr. Mineral. and Petrol. 44, 149–156 (1974). https://doi.org/10.1007/BF00385787
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DOI: https://doi.org/10.1007/BF00385787