Cation Diffusion in Plagioclase Feldspar
- 3 August 1984
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 225 (4661), 504-505
- https://doi.org/10.1126/science.225.4661.504
Abstract
Steep compositional gradients in igneous plagioclase feldspar from slowly cooled intrusive bodies imply a maximum value of the intracrystalline diffusion coefficient for NaSi [unknown] CaAl exchange, Dmax ∼10-20 centimeters squared per second for temperatures in the range 1250° to 1000°C. Millimeter-sized grains cannot be homogenized in all geologic time; hence reactive equilibrium crystallization of plagioclase from the melt does not occur in dry systems.Keywords
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