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Article
Strain Within the Ultrahigh‐Pressure Western Gneiss Region of Norway Recorded by Quartz CPOs
Geological Society of London, Special Publications
  • Nicolas C. Barth, University of California - Santa Barbara
  • Bradley R. Hacker, University of California - Santa Barbara
  • Gareth G.E. Seward, University of California - Santa Barbara
  • Emily O. Walsh, Cornell College
  • David Young, University of Texas at San Antonio
  • Scott Johnston, California Polytechnic State University - San Luis Obispo
Publication Date
1-1-2010
Abstract
Electron back‐scatter diffraction was used to measure the crystal preferred orientations (CPOs) from 101 samples across the ultrahigh‐pressure Western Gneiss Region of Norway to assess slip systems, sense of shear, CPO strength, and strain geometry. The CPOs suggest a dominance of prism slip, with lesser amounts of prism [c] slip and basal slip; there are few Type‐I and Type‐II girdles. The major structural feature in the study area—the high‐strain, top‐W, normal‐sense Nordfjord–Sogn Detachment Zone—is characterized by asymmetric and strong CPOs; an eastern domain with strong asymmetric CPOs shows top‐E shear. Strain throughout the study area was characterized by a mix of plane strain and constriction with no evidence of flattening. Adjacent gneiss and quartzite/vein samples have similar CPOs.
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Citation Information
Nicolas C. Barth, Bradley R. Hacker, Gareth G.E. Seward, Emily O. Walsh, et al.. "Strain Within the Ultrahigh‐Pressure Western Gneiss Region of Norway Recorded by Quartz CPOs" Geological Society of London, Special Publications Vol. 335 (2010) p. 663 - 685
Available at: http://works.bepress.com/scjohnst/3/