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Ultrafine-grained quartz mylonites from high-grade shear zones: Evidence for strong dry middle to lower crust

Fitz Gerald, John; Mancktelow, Neil; Pennacchioni, Giorgio; Kunze, K


Creep strength of the crust depends upon the rheology of the most common mineral, usually quartz. Recrystallized quartz grains in many high-grade shear zones from the middle to lower crust are typically large (millimeter sized), implying active grain boundary migration, but equivalents from old polymetamorphic and water-deficient basement sheared at similar crustal depths can be very small. For the latter, strong crystallographic preferred orientation (CPO) of quartz, with c axes aligned close...[Show more]

CollectionsANU Research Publications
Date published: 2006
Type: Journal article
Source: Geology
DOI: 10.1130/G22099.1


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