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Leucoxene fish as a micro-kinematic indicator

Authors
Journal
Journal of Structural Geology
0191-8141
Publisher
Elsevier
Publication Date
Volume
18
Issue
12
Identifiers
DOI: 10.1016/s0191-8141(96)00067-3
Keywords
  • Brevia
Disciplines
  • Earth Science

Abstract

Abstract Asymmetric aggregates of fine-grained leucoxene and quartz are reported from siliceous L- S tectonites deformed by progressive simple shear. The leucoxene fish, morphologically similar to mica fish, consistently yield shear senses in agreement with other kinematic criteria. We interpret the leucoxene as a pre- or early syntectonic alteration product of detrital heavy-minerals in a siliciclastic protolith. The leucoxene fish behave as passive markers, and they record kinematics by modification of pre-existing aggregates rather than syndeformational mineral growth. For siliceous metasedimentary rocks otherwise lacking in micro-kinematic indicators, leucoxene fish may provide an alternative to quartz c-axis analysis.

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