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Crystallographic investigations of calcic plagioclase from the Bad Vermilion Lake anorthosite complex, Ontario

Tokuhei Tagai, Hiroshi Takeda, Hiroshi Mori, Junitirou Ichikawa, Ryoichi Tachibana and Donald A. Morrison
Crystallographic investigations of calcic plagioclase from the Bad Vermilion Lake anorthosite complex, Ontario
European Journal of Mineralogy (April 1992) 4 (2): 299-305

Abstract

The microstructures of plagioclase from this anorthosite were studied by EPMA, XRD, EM and TEM. The plagioclase (bytownite) shows the a, b, c and e reflections in the diffraction pattern, indicating the existence of Huttenlocher exsolution. In TEM, the antiphase boundaries (APB) were observed, where the b APBs show partly zigzag-like forms. The characteristics of the intensity distributions of b, c and e reflections and the APB form indicate that the plagioclase experienced the plutonic-like cooling rate at high T, a very slow cooling with more rapid cooling than that of metamorphic rocks at <= 650 degrees C and extra slow cooling to room T.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 4
Serial Issue: 2
Title: Crystallographic investigations of calcic plagioclase from the Bad Vermilion Lake anorthosite complex, Ontario
Affiliation: University of Tokyo, Mineralogical Institute, Tokyo, Japan
Pages: 299-305
Published: 199204
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 32
Accession Number: 1995-056229
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
N42°00'00" - N57°00'00", W95°00'00" - W74°00'00"
Secondary Affiliation: NASA, Johnson Space Center, USA, United States
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199520
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