Complete Fabric Analysis of Some Commonly Observed Quartz C-Axis Patterns

  1. B.E. Hobbs and
  2. H.C. Heard
  1. S. M. Schmid and
  2. M. Casey

Published Online: 18 MAR 2013

DOI: 10.1029/GM036p0263

Mineral and Rock Deformation: Laboratory Studies: The Paterson Volume

Mineral and Rock Deformation: Laboratory Studies: The Paterson Volume

How to Cite

Schmid, S. M. and Casey, M. (1986) Complete Fabric Analysis of Some Commonly Observed Quartz C-Axis Patterns, in Mineral and Rock Deformation: Laboratory Studies: The Paterson Volume (eds B.E. Hobbs and H.C. Heard), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM036p0263

Author Information

  1. Geologisches Institut, ETH-Zentrum, CH8092 Zürich, Switzerland

Publication History

  1. Published Online: 18 MAR 2013
  2. Published Print: 1 JAN 1986

ISBN Information

Print ISBN: 9780875900629

Online ISBN: 9781118664353

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Keywords:

  • Rocks—Testing—Addresses, essays, lectures;
  • Rock deformation—Addresses, essays, lectures

Summary

The results of a complete fabric analysis based on naturally deformed quartzites suggest that slip in the crystallographic (a) direction dominates over other possible slip directions. Slip on the first order prisms, the positive and negative rhombs, and the basal plane are inferred from the fabric analysis. Unequal slip activity on positive and negative rhombs is interpreted to be primarily responsible for the preferred orientation of these forms. With the help of a calculation of the orientation distribution function (ODF) we propose an interpretation of pole figures for the c-and a-axes in terms of active slip systems, the type of finite strain and the kinematic framework. A consideration of the mechanisms of lattice reorientation suggests that both inhomogeneous deformation and syntectonic recrystallization play an important role in establishing favoured crystal orientations for easy slip in progressive deformation.