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Slip-system and EBSD analysis on compressively deformed fine-grained polycrystalline olivine

By
R. J. M. Farla
R. J. M. Farla
Research School of Earth Sciences, Building 61, The Australian National University, Canberra ACT 0200, Australia
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J. D. Fitz Gerald
J. D. Fitz Gerald
Research School of Earth Sciences, Building 61, The Australian National University, Canberra ACT 0200, Australia
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H. Kokkonen
H. Kokkonen
Research School of Earth Sciences, Building 61, The Australian National University, Canberra ACT 0200, Australia
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A. Halfpenny
A. Halfpenny
Research School of Earth Sciences, Building 61, The Australian National University, Canberra ACT 0200, Australia
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U. H. Faul
U. H. Faul
Department of Earth Sciences, Boston University, 675 Commonwealth Ave., Boston, MA 002215, USA
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I. Jackson
I. Jackson
Research School of Earth Sciences, Building 61, The Australian National University, Canberra ACT 0200, Australia
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Published:
January 01, 2011

Abstract

A slip-system analysis was performed on two synthetic compressively deformed olivine aggregates, derived from experimental solution–gelation (sol–gel) and natural San Carlos precursors to determine how dislocation density relates to Schmid factor for slip in olivine. Individual grain orientations were measured with electron backscatter diffraction. Using decorated dislocations, grain populations were separated into subsets of high versus low dislocation density. Analysis of preferred orientations and distributions of Schmid factors suggests that there is only weak correlation between Schmid factor and dislocation density, slip on (010)[100] in San Carlos grains but (001)[100] in sol–gel material, with multiple slip or stress heterogeneity in both.

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Contents

Geological Society, London, Special Publications

Deformation Mechanisms, Rheology and Tectonics: Microstructures, Mechanics and Anisotropy

David J. Prior
David J. Prior
University of Otago, New Zealand
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Ernest H. Rutter
Ernest H. Rutter
University of Manchester, UK
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Daniel J. Tatham
Daniel J. Tatham
University of Liverpool, UK
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Geological Society of London
Volume
360
ISBN electronic:
9781862394483
Publication date:
January 01, 2011

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