Fabric studies within the Cascade Lake shear zone, Sierra Nevada, California

Basil Tikoff, Matthew R. Davis, Christian Teyssier, Michel de St. Blanquat, Guillaume Habert, Sven Morgan

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

The Cascade Lake shear zone occurs on the eastern margin of the Tuolumne Intrusive Suite, Sierra Nevada Batholith, California. Foliation in the zone is NNW trending and subvertical, and lineation is moderately south plunging. Deformation is syn-tectonic with emplacement of the Cathedral Peak granodiorite. A deformation gradient exists toward the NE margin of this pluton, with higher strains and lower temperatures of deformation found near the contact. We compare fabric data collected very densely in this shear zone using several techniques: field fabrics, 3D orientation of K-feldspar megacrysts, and AMS (anisotropy of magnetic susceptibility) analysis. In general, the results from the three different methods are in agreement. Deformation in this shear zone is part of a larger pattern of deformation within the Cathedral Peak granodiorite, as recorded by AMS analysis, and dextral shearing associated within the last stage of plutonism within the Sierra Nevada magmatic arc.

Original languageEnglish (US)
Pages (from-to)209-226
Number of pages18
JournalTectonophysics
Volume400
Issue number1-4
DOIs
StatePublished - May 11 2005

Keywords

  • Fabric analysis
  • Shear zone
  • Sierra Nevada

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    Tikoff, B., Davis, M. R., Teyssier, C., de St. Blanquat, M., Habert, G., & Morgan, S. (2005). Fabric studies within the Cascade Lake shear zone, Sierra Nevada, California. Tectonophysics, 400(1-4), 209-226. https://doi.org/10.1016/j.tecto.2005.03.003