flow banding

GLOSSARY OF VOLCANIC TERMS
A foliation commonly observed in intermediate and felsic lavas, that results from shearing of the lava during laminar flow (Cas and Wright, 1987, p. 78). In rhyolite flows, flow banding is commonly exhibited by alternating bands comprising volcanic glass and spherulites (small, radiating bodies of devitrified glass).

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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