orthomagmatic stage

orthomagmatic stage

[¦ȯr·thō‚mag′mad·ik ′stāj]
(geology)
The principal stage in the crystallization of silicates from a typical magma; up to 90% of the magma may crystallize during this stage. Also known as orthotectic stage.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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