Title

Influence of Biotite and Foliation on Brittle Deformation of Gneiss

Document Type

Contribution to Book

Journal/Book Title/Conference

Atlas of Mylonitic and Fault-Related Rocks

Publisher

Princeton University Press

Publication Date

1998

First Page

40

Last Page

41

Abstract

Experimental work of Borg and Handin (1966) and Gottschalk and others (1990) indicates that relatively small quantities of biotite and gneissic foliation may influence the orientation, location, and density of fractures and subsequent faults in brittlely deformed rocks. The examples presented here are from naturally deformed granite gneisses in south­western Montana, and are analogous to the features described in previous experimental work. Archean gneisses in the foot-wall and hanging wall of the Scarface thrust were deformed at depths no greater than 4 km during early Tertiary, east-directed thrusting (Schmidt and others, 1993). The protolith consists of well-foliated, medium-grained quartz-feldspar-biotite gneiss. Few fractures exist in undeformed samples of the rock.

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