Basal slip and texture development in calcite: new results from torsion experiments

The deformation behavior of calcite has been of longstanding interest. Through experiments on single crystals, deformation mechanisms were established such as mechanical twinning on in the positive sense and slip on and both in the negative sense. More recently it was observed that at higher tempera...

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Bibliographic Details
Published in:Physics and chemistry of minerals 2007-03, Vol.34 (2), p.73-84
Main Authors: Barber, D. J., Wenk, H.-R., Gomez-Barreiro, J., Rybacki, E., Dresen, G.
Format: Article
Language:English
Subjects:
CALCITE
COMPRESSION
Crystals
DEFORMATION
Deformation mechanisms
DIFFRACTION
DISLOCATIONS
DOLOMITE
Experiments
GEOSCIENCES
High temperature
Mechanical twinning
MONOCRYSTALS
PLASTICITY
POLYCRYSTALS
Single crystals
SLIP
TEXTURE
TORSION
TRANSMISSION ELECTRON MICROSCOPY
TWINNING
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Summary:The deformation behavior of calcite has been of longstanding interest. Through experiments on single crystals, deformation mechanisms were established such as mechanical twinning on in the positive sense and slip on and both in the negative sense. More recently it was observed that at higher temperatures slip in both senses becomes active and, based on slip line analysis, it was suggested that slip may occur. So far there had been no direct evidence for basal slip, which is the dominant system in dolomite. With new torsion experiments on calcite single crystals at 900 K and transmission electron microscopy, this study identifies slip unambiguously by direct imaging of dislocations and diffraction contrast analysis. Including this slip system in polycrystal plasticity simulations, enigmatic texture patterns observed in compression and torsion of calcite rocks at high temperature can now be explained, resolving a long-standing puzzle.
ISSN:0342-1791
1432-2021
DOI:10.1007/s00269-006-0129-3