Show simple item record

dc.contributor.authorEvans, Katy
dc.contributor.authorDyar, M.
dc.contributor.authorReddy, Steven
dc.contributor.authorLanzirotti, A.
dc.contributor.authorAdams, D.
dc.contributor.authorTailby, N.
dc.date.accessioned2017-01-30T14:37:42Z
dc.date.available2017-01-30T14:37:42Z
dc.date.created2014-09-24T20:00:18Z
dc.date.issued2014
dc.identifier.citationEvans, K. and Dyar, M. and Reddy, S. and Lanzirotti, A. and Adams, D. and Tailby, N. 2014. Variation in XANES in biotite as a function of orientation, crystal composition, and metamorphic history. American Mineralogist. 99 (2-3): pp. 443-457.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/39843
dc.identifier.doi10.2138/am.2014.4222
dc.description.abstract

Microscale analysis of ferrous:ferric iron ratios in silicate minerals has the potential to constrain geological processes but has proved challenging because textural information and spatial resolution are limited with bulk techniques, and in situ methods have limited spatial resolution. Synchrotron methods, such as XANES, have been hampered by the sensitivity of spectra to crystal orientation and matrix effects. In an attempt to break this nexus, biotites from Tanzania were characterized with a combination of optical microscopy, electron microprobe, Mössbauer analysis, electron backscatter diffraction (EBSD) and X-ray absorption near edge structure (XANES) spectroscopy. Pre-edge and edge characteristics of the FeKa absorption feature were compared to orientation information derived by EBSD and ferric iron content derived from Mössbauer analysis. Statistically significant correlations between measured spectral features and optic/crystallographic orientation were observed for individual samples. However, orientation corrections derived from these correlations did not reduce the uncertainty in Fe3+/Fetot. The observations are consistent with matrix- and ordering-dependency of the XANES features, and further work is necessary if a general formulation for orientation corrections is to be devised.

dc.publisherMineralogical Society of America
dc.subjectorientation
dc.subjectFe
dc.subjectbiotite
dc.subjectoxidation
dc.subjectXANES
dc.titleVariation in XANES in biotite as a function of orientation, crystal composition, and metamorphic history
dc.typeJournal Article
dcterms.source.volume99
dcterms.source.startPage443
dcterms.source.endPage457
dcterms.source.issn0003-004X
dcterms.source.titleAmerican Mineralogist
curtin.note

NOTICE: This is the author’s version of a work in which changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication.

curtin.departmentDepartment of Applied Geology
curtin.accessStatusOpen access


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record