A Geoscience Digital Image Library

TitleAsymmetrical recrystallization tails on feldspar porphyroclasts
DescriptionThe mylonitized Ayer Granite from the Washusett mylonite zone in eastern Massachusetts (Goldstein, 1994, Tectonics) illustrates sigma-grain geometry. The view is 3.5 mm in long dimension, cut perpendicular to foliation and parallel to foliation, seen in plane polarized light.
LocationUSA ▹ Massachusetts. Eastern Massachusetts.
PhotographerArthur Goldstein. 1995.
CollectionKeck Structural Geology Slide Set #AG2.
Key wordsporphyroclasts, mylonite, tails
Tech details684 KB. Thin section.
GeoDIL number3002