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Tourmaline concentrations in migmatite metasedimentary rocks of the Riziana and Kolchiko areas in Macedonia, northern Greece

Kleopas Michailidis and Anna Kassoli-Fournaraki
Tourmaline concentrations in migmatite metasedimentary rocks of the Riziana and Kolchiko areas in Macedonia, northern Greece
European Journal of Mineralogy (August 1994) 6 (4): 557-569

Abstract

Tourmaline from these metasediments show features that relate to the evolution of regional metamorphism and deformation. The tourmalines occur as megacrysts in anatectic pegmatitic leucosomes or as coarse-grained crystals (up to 7 cm) in felsic bands in the metamorphic rocks. Many of the tourmalines display a concentric colour zoning, while some are unzoned, diffusely zoned or show patchy areas of colour. The zoned grains have light blue-green cores and olive-brown-green rims and mainly belong to the schorl-dravite series, with schorlitic cores. Field, textural and chemical data support a pre-metamorphic origin for tourmaline from B-rich partial melts or fluids rather than crystallization of porphyroblasts during regional metamorphism. Following their initial development, a complex sequence of deformation and metamorphic events significantly modified the texture of the host rocks. The poikiloblastic form, the polycrystalline domains and the diffuse zoning, as well as the penetrative fabric of the host rock, are all considered to be due to syntectonic metamorphic crystallization.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 6
Serial Issue: 4
Title: Tourmaline concentrations in migmatite metasedimentary rocks of the Riziana and Kolchiko areas in Macedonia, northern Greece
Affiliation: Aristotle University of Thessaloniki, Department of Mineralogy-Petrology-Economic Geology, Salonika, Greece
Pages: 557-569
Published: 199408
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 52
Accession Number: 1995-001813
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N34°55'00" - N41°45'00", E19°30'00" - E28°45'00"
N40°52'00" - N42°15'00", E20°26'60" - E23°04'60"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199501
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