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Epitaxial nucleation of garnet on biotite in the polymetamorphic metapelites surrounding the Vedrette di Ries Intrusion (Italian Eastern Alps)

Stephanie J. Moore, Bernardo Cesare and William D. Carlson
Epitaxial nucleation of garnet on biotite in the polymetamorphic metapelites surrounding the Vedrette di Ries Intrusion (Italian Eastern Alps)
European Journal of Mineralogy (February 2015) 27 (1): 5-18

Abstract

Garnet in a metapelite from the aureole of the Vedrette di Ries tonalite, Eastern Alps, is found in two distinctive microstructural settings relative to a large single crystal of biotite: it forms a narrow polycrystalline layer in a reaction zone between plagioclase and biotite, and nearby it occurs in clusters of crystals interspersed with the biotite. In the reaction zone, morphological and microchemical evidence document multiple nucleation events along the interface between biotite and plagioclase, with ilmenite inclusions marking the original plagioclase-biotite boundary. Electron backscatter diffraction analysis shows that for all garnet in both microstructural settings, (110) (sub grt) (001) (sub bt) with [100] (sub grt) [100] (sub bt) . This single, recurring orientation for all garnet crystals adjacent to the biotite grain implies that nucleation was dominantly epitaxial during crystallization of the garnet. The occurrence is remarkable for the clear genetic relationships revealed by the microstructures and for its preservation of the mica substrate on which the garnet nucleated, which allows unambiguous determination of not only the coincident lattice planes but also the coincident lattice directions involved in the epitaxy.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 27
Serial Issue: 1
Title: Epitaxial nucleation of garnet on biotite in the polymetamorphic metapelites surrounding the Vedrette di Ries Intrusion (Italian Eastern Alps)
Affiliation: University of Texas at Austin, Department of Geological Sciences, Austin, TX, United States
Pages: 5-18
Published: 201502
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 34
Accession Number: 2015-067751
Categories: Igneous and metamorphic petrologyMineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
N46°51'16" - N46°51'16", E11°51'16" - E11°51'16"
N46°53'01" - N46°53'01", E12°03'58" - E12°03'58"
N46°52'53" - N46°52'53", E11°59'34" - E11°59'34"
Secondary Affiliation: Universita di Padova, Dipartimento di Geoscienze, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201529
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