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Three-dimensional textural and chemical characterization of polyphase inclusions in spodumene using a dual focused ion beam-scanning electron microscope (FIB-SEM)

Alan J. Anderson and Travis McCarron
Three-dimensional textural and chemical characterization of polyphase inclusions in spodumene using a dual focused ion beam-scanning electron microscope (FIB-SEM)
The Canadian Mineralogist (April 2011) 49 (2): 541-553

Abstract

A dual-beam focused ion-beam--scanning electron microscope (FIB-SEM) instrument was used for detailed textural and chemical analysis of polyphase inclusions in spodumene. Our 3D representation of an inclusion (GB-38) was constructed from SEM images of serial cross-sections exposed by milling laterally through a selected inclusion with a 30 keV beam of Ga ions. The volume of the inclusion and daughter phases was determined from the sum of the volume of parallel slices; the volume of each slice was determined by multiplying the measured slice area by its thickness. Semiquantitative energy-dispersive X-ray (EDX) analysis and element mapping were performed on each cross-section to facilitate the identification of all solids within the inclusion. FIB-SEM analysis of spodumene-hosted inclusions from the Tanco and Greenbushes occurrences of granitic pegmatite are presented to demonstrate the advantages of 3D analysis for petrographic investigations of polyphase inclusions. The high-resolution 3D reconstructions afforded by the FIB-SEM method significantly extend our ability to study and interpret complex solid-rich fluid and melt inclusions in igneous and in high-pressure metamorphic rocks.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 49
Serial Issue: 2
Title: Three-dimensional textural and chemical characterization of polyphase inclusions in spodumene using a dual focused ion beam-scanning electron microscope (FIB-SEM)
Affiliation: Saint Francis Xavier University, Department of Earth Sciences, Antigonish, NS, Canada
Pages: 541-553
Published: 201104
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 60
Accession Number: 2011-059306
Categories: General mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201133
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