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dc.contributor.authorMcLaren, S.
dc.contributor.authorReddy, Steven
dc.date.accessioned2017-01-30T14:54:26Z
dc.date.available2017-01-30T14:54:26Z
dc.date.created2008-11-12T23:36:45Z
dc.date.issued2008
dc.identifier.citationMcLaren, Sandra and Reddy, Steven M.. 2008. Automated mapping of K-feldspar by electron backscatter diffraction (EBSD) and application to 40Ar/39Ar dating. Journal of Structural Geology 30 (10): 1229-1241.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/41674
dc.identifier.doi10.1016/j.jsg.2008.05.008
dc.description.abstract

The ability to quantify feldspar microstructure using the electron backscatter diffraction (EBSD) method has direct application in the study of rock deformation and strain kinematics. However, automated EBSD analysis of low symmetry phases, such as feldspar, has previously proven difficult. Here, we successfully apply the EBSD method to a number of granitic feldspars and develop automated phase and orientation mapping to discriminate K-feldspar and plagioclase, and quantify orientation variations within individual K-feldspar grains. These results represent the first automated quantitative mapping of orientation microstructure in K-feldspar. We use the method to evaluate the relationship between microstructure and 40Ar/39Ar age, a controversial problem in thermochronology. In a granitic K-feldspar from central Australia, the range of observed orientation domains matches the small-intermediate and largest domain sizes predicted from multiple-diffusion domain modelling. In situ ultra-violet laser microprobe analyses show that the youngest ages from the 40Ar/39Ar age spectra are recorded by grain mosaic K-feldspars with diameter around 10-50 m. These K-feldspars are the smallest coherent microstructural features observed on scales of > 1 m. Large 250-1000 m diameter microstructurally simple grains record the oldest ages observed in the age spectrum. These results suggest a first order relationship between K-feldspar microstructure and 40Ar/39Ar age and demonstrate a microstructural control on multidomain diffusion.

dc.publisherPergamon-Elsevier Science Ltd.
dc.subjectElectron Backscatter diffraction (EBSD)
dc.subjectmicrostructure
dc.subjectMulti-domain diffusion (MDD)
dc.subjectthermochronology
dc.subjectdeformation
dc.subjectargon
dc.titleAutomated mapping of K-feldspar by electron backscatter diffraction (EBSD) and application to 40Ar/39Ar dating
dc.typeJournal Article
dcterms.source.volume30
dcterms.source.number10
dcterms.source.monthoct
dcterms.source.startPage1229
dcterms.source.endPage1241
dcterms.source.titleJournal of Structural Geology
curtin.note

McLaren, Sandra and Reddy, Steven M. (2008) Automated mapping of K-feldspar by electron backscatter diffraction (EBSD) and application to 40Ar/39Ar dating, Journal of Structural Geology 30(10):1229-1241.

curtin.note

The link to this article is: http://dx.doi.org/10.1016/j.jsg.2008.05.008

curtin.note

Copyright 2008 Elsevier B.V. All rights reserved

curtin.identifierEPR-3317
curtin.accessStatusOpen access
curtin.facultyDepartment of Applied Geology
curtin.facultyDivision of Resources and Environment


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