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Residual lattice strain in quartzites as a potential palaeo-piezometer

Journal Article · · Geophysical Journal International
DOI:https://doi.org/10.1093/gji/ggaa226· OSTI ID:1633128
 [1];  [1];  [2];  [3];  [4];  [5]
  1. Department of Earth and Planetary Science, Univ. California, Berkeley CA 94720, USA
  2. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, PR China
  3. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, PR China, School of Materials Science and Engineering, Chang’an University, Xi’an, Shaanxi 710064, PR China
  4. Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley CA 94720, USA
  5. Department of Earth and Planetary Science, Univ. California, Berkeley CA 94720, USA, Xi’an Polytechnic University, Xi’an 710048, PR China
+ Show Author Affiliations
SUMMARY

If a crystal lattice is subjected to a stress, it becomes distorted and no longer represents the ideal crystal symmetry, and if the stress introduces defects such as dislocations, some of this distortion is preserved after the applied stress is removed. In this study, we investigate lattice distortion in quartz at the micron scale with synchrotron X-ray Laue diffraction. From Laue images the local deviatoric strain tensor is derived and corresponding stresses are calculated based on elastic properties. The method is applied to metasedimentary quartzites from the Bergell Alps that were deformed at conditions of greenschist facies metamorphism. The residual palaeostrain is represented in maps of the deviatoric strain tensor components and with deviatoric strain axis pole figures. Data suggest overall shortening perpendicular to the schistosity plane but with considerable asymmetry relative to foliation and lineation, probably attributed to simple shear. Crystallographic pole figures from Laue diffraction agree with neutron diffraction and EBSD measurements and display quartz c-axes girdle distributions with maxima also perpendicular to schistosity. The method shows promise to be used as a palaeo-piezometer to unravel the stress field during tectonic deformation.

Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Key Science and Technology Program of Shaanxi Province
OSTI ID:
1633128
Alternate ID(s):
OSTI ID: 1769316
Journal Information:
Geophysical Journal International, Journal Name: Geophysical Journal International Journal Issue: 2 Vol. 222; ISSN 0956-540X
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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