Leucoxene fish as a micro-kinematic indicator

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 leucoxen...

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Bibliographic Details
Published in:Journal of structural geology 1996-12, Vol.18 (12), p.1493,1497-1495,1497
Main Authors: Oliver, Douglas H., Goodge, John W.
Format: Article
Language:English
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Summary: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.
ISSN:0191-8141
1873-1201
DOI:10.1016/S0191-8141(96)00067-3