Abstract
Of 61 K-feldspar megacrysts examined from one granodiorite pluton, local shearing has rendered nine triclinic with γ <88.2° and twelve triclinic with γ >89.3°. On a Δbcvs. Δα*γ* plot, both triclinic groups show an ordering trend parallel to the ‘one-step’ trend of albite; there is a discontinuity between these groups across which it is postulated that γ changes by about 1 ° with no change in order.
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