Quantitative characterization of plastic deformation of zircon and geological implications

The deformation-related microstructure of an Indian Ocean zircon hosted in a gabbro deformed at amphibolite grade has been quantified by electron backscatter diffraction. Orientation mapping reveals progressive variations in intragrain crystallographic orientations that accommodate 20 degrees of mis...

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Published in:Contributions to mineralogy and petrology 2007-06, Vol.153 (6), p.625-645
Main Authors: Reddy, Steven M., Timms, Nicholas E., Pantleon, Wolfgang, Trimby, Patrick
Format: Article
Language:English
Subjects:
Boundaries
Crystallography
Deformation
Diffraction
Geochemistry
Metamorphism
Mineralogy
Petrology
Trace elements
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description The deformation-related microstructure of an Indian Ocean zircon hosted in a gabbro deformed at amphibolite grade has been quantified by electron backscatter diffraction. Orientation mapping reveals progressive variations in intragrain crystallographic orientations that accommodate 20 degrees of misorientation in the zircon crystal. These variations are manifested by discrete low-angle (
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Orientation mapping reveals progressive variations in intragrain crystallographic orientations that accommodate 20 degrees of misorientation in the zircon crystal. These variations are manifested by discrete low-angle (&lt;4 degrees) boundaries that separate domains recording no resolvable orientation variation. The progressive nature of orientation change is documented by crystallographic pole figures which show systematic small circle distributions, and disorientation axes associated with 0.5-4 degrees disorientation angles, which lie parallel to rational low index crystallographic axes. In the most distorted part of the grain (area A), this is the [100] crystal direction. A quaternion analysis of orientation correlations confirms the [100] rotation axis inferred by stereographic inspection, and reveals subtle orientation variations related to the local boundary structure. Microstructural characteristics and orientation data are consistent with the low-angle boundaries having a tilt boundary geometry with dislocation line [100]. This tilt boundary is most likely to have formed by accumulation of edge dislocations associated with a {100} slip system. Analysis of the energy associated with these dislocations suggest they are energetically more favorable than TEM verified {100} slip. Analysis of minor boundaries in area A indicates deformation by either (001) edge, or [100](100) and [001](100) screw dislocations. In other parts of the grain, cross slip on (111), and (112) planes seems likely. These data provide the first detailed microstructural analysis of naturally deformed zircon and indicate ductile crystal-plastic deformation of zircon by the formation and migration of dislocations into low-angle boundaries. Minimum estimates of dislocation density in the low-angle boundaries are of the order of ~3.1010 cm-2. 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subjects Boundaries
Crystallography
Deformation
Diffraction
Geochemistry
Metamorphism
Mineralogy
Petrology
Trace elements
title Quantitative characterization of plastic deformation of zircon and geological implications
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