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GEOREF RECORD

Replacement of graphic pegmatite by graphic albite-actinolite-clinopyroxene intergrowths (Mjavatn, southern Norway)

Timo G. Nijland and Jacques L. R. Touret
Replacement of graphic pegmatite by graphic albite-actinolite-clinopyroxene intergrowths (Mjavatn, southern Norway)
European Journal of Mineralogy (February 2001) 13 (1): 41-50

Abstract

After peak metamorphism, the Sveconorwegian orogen in the Bamble sector underwent three separate events: the intrusion of granitic pegmatites, regional but locally acting metasomatism, and the intrusion of post tectonic granites. Metasomatism resulted in localized but widespread formation of albite-actinolite/clinopyroxene-quartz assemblages, with associated monomineralic veins of actinolite, Ti and other minerals. At one locality, the Mjavatn pegmatite, graphic quartz-K-feldspar intergrowths were replaced by graphic albite-actinolite-clinopyroxene intergrowths. The preservation of the graphic texture, implying conservation of volume, allows quantification of mass transfer. The application of Greens' composition-volume relationships for metasomatism (isocon diagrams) indicates massive influxes of Al, Na, Ca, Mg and Fe, accompanied by removal of K and some Si. Fluid inclusion studies demonstrate that NaCl rich brines were probably the transport medium. Metasomatism is estimated to have occurred at 350-450 degrees C, 2-4 kbar.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 13
Serial Issue: 1
Title: Replacement of graphic pegmatite by graphic albite-actinolite-clinopyroxene intergrowths (Mjavatn, southern Norway)
Affiliation: Rooseveltlaan 964, Utrecht, Netherlands
Pages: 41-50
Published: 200102
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 39
Accession Number: 2001-022807
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch map
N58°00'00" - N71°00'00", E04°00'00" - E31°00'00"
Secondary Affiliation: Vrije Universiteit, NLD, Netherlands
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200108
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