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Dislocation-mechanism of clinoamphibole formation in deformed augite

Werner Skrotzki
Dislocation-mechanism of clinoamphibole formation in deformed augite
European Journal of Mineralogy (April 2001) 13 (2): 245-252

Abstract

Clinoamphibole formation in naturally deformed augite from a pyroxenite dyke of the Balmuccia peridotite massif (Ivrea Zone, NW-Italy) has been studied by conventional and high resolution transmission electron microscopy. The clinoamphibole lamellae are oriented parallel to (010) and have their crystallographic axes parallel to those of the augite. They originate from dissociation of certain lattice dislocations. The shear produced by glide of 1/2 [101] partial dislocations in (010) combines single to double chains, yielding so-called chain multiplicity faults. The ion exchange necessary for amphibole formation most probably is towards and along the core of the partials. Broadening of the lamellae occurs by lateral motion of partial dislocations along the (010) interface two chains apart. The formation of clinoamphibole is discussed with respect to exsolution and alteration, phase stability and reaction kinetics.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 13
Serial Issue: 2
Title: Dislocation-mechanism of clinoamphibole formation in deformed augite
Author(s): Skrotzki, Werner
Affiliation: Technische Universitaet Dresden, Institut fuer Kristallographie und Festkoerperphysik, Dresden, Federal Republic of Germany
Pages: 245-252
Published: 200104
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 27
Accession Number: 2001-049309
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200115
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