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

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doi: 10.1127/0935-1221/01/0013-0041
Authors:Nijland, Timo G.; Touret, Jacques L. R.
Author Affiliations:Primary:
Rooseveltlaan 964, Utrecht, Netherlands
Other:
Vrije Universiteit, Netherlands
Volume Title:European Journal of Mineralogy
Source:European Journal of Mineralogy, 13(1), p.41-50. Publisher: Schweizerbart'sche Verlagsbuchhandlung (Nägele u. Obermiller), Stuttgart, Federal Republic of Germany. ISSN: 0935-1221
Publication Date:2001
Note:In English. 39 refs.; illus., incl. 3 tables, sketch map
Summary: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°C, 2-4 kbar. [R.A.H.]
Sections:Petrology
Subsections:Metamorphism: thermal, metasomatic
Subjects:Actinolite; Albite; Amphibole group; Brines; Chain silicates; Chlorides; Clinoamphibole; Clinopyroxene; Feldspar group; Fluid phase; Framework silicates; Granites; Graphic texture; Halides; Igneous rocks; Intergrowths; Metasomatism; P-T conditions; Pegmatite; Plagioclase; Plutonic rocks; Pyroxene group; Quartz; Silica minerals; Silicates; Sodium chloride; Textures; Europe; Norway; Scandinavia; Western Europe; Mjavatn Norway
Abstract Numbers:01M/3487
Record ID:2001022807
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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040 |a ViAlAGI  |c ViAlAGI 
072 7 |a 05A  |2 georeft 
100 1 |a Nijland, Timo G.  |e analytic author  |u Rooseveltlaan 964, Utrecht 
245 1 0 |a Replacement of graphic pegmatite by graphic albite-actinolite-clinopyroxene intergrowths (Mjavatn, southern Norway) 
300 |a p. 41-50 
500 |a In English. 39 refs. 
500 |a Abstract number: 01M/3487 
500 |a Abstractor: R.A.H. 
500 |a Category Section: Petrology 
500 |a Category Subsection: Metamorphism: thermal, metasomatic 
500 |a Affiliation: Rooseveltlaan 964; Utrecht; NLD; Netherlands 
500 |a Affiliation: Vrije Universiteit; ; NLD; Netherlands 
500 |a Key title: European Journal of Mineralogy 
500 |a Source note: European Journal of Mineralogy, 13(1), p.41-50. Publisher: Schweizerbart'sche Verlagsbuchhandlung (Nägele u. Obermiller), Stuttgart, Federal Republic of Germany. ISSN: 0935-1221 
500 |a Publication type: journal article 
504 |b 39 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom 
520 |a 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°C, 2-4 kbar. 
650 7 |a Actinolite  |2 georeft 
650 7 |a Albite  |2 georeft 
650 7 |a Amphibole group  |2 georeft 
650 7 |a Brines  |2 georeft 
650 7 |a Chain silicates  |2 georeft 
650 7 |a Chlorides  |2 georeft 
650 7 |a Clinoamphibole  |2 georeft 
650 7 |a Clinopyroxene  |2 georeft 
650 7 |a Feldspar group  |2 georeft 
650 7 |a Fluid phase  |2 georeft 
650 7 |a Framework silicates  |2 georeft 
650 7 |a Granites  |2 georeft 
650 7 |a Graphic texture  |2 georeft 
650 7 |a Halides  |2 georeft 
650 7 |a Igneous rocks  |2 georeft 
650 7 |a Intergrowths  |2 georeft 
650 7 |a Metasomatism  |2 georeft 
650 7 |a P-T conditions  |2 georeft 
650 7 |a Pegmatite  |2 georeft 
650 7 |a Plagioclase  |2 georeft 
650 7 |a Plutonic rocks  |2 georeft 
650 7 |a Pyroxene group  |2 georeft 
650 7 |a Quartz  |2 georeft 
650 7 |a Silica minerals  |2 georeft 
650 7 |a Silicates  |2 georeft 
650 7 |a Sodium chloride  |2 georeft 
650 7 |a Textures  |2 georeft 
651 7 |a Europe  |2 georeft 
651 7 |a Norway  |2 georeft 
651 7 |a Scandinavia  |2 georeft 
651 7 |a Western Europe  |2 georeft 
653 |a Mjavatn Norway 
700 1 |a Touret, Jacques L. R.,  |e analytic author  |u Vrije Universiteit 
773 0 |t European Journal of Mineralogy  |d Stuttgart : Schweizerbart'sche Verlagsbuchhandlung (Nägele u. Obermiller), Feb. 2001  |x 0935-1221  |n European Journal of Mineralogy, 13(1), p.41-50. Publisher: Schweizerbart'sche Verlagsbuchhandlung (Nägele u. Obermiller), Stuttgart, Federal Republic of Germany. ISSN: 0935-1221 Publication type: journal article  |g Vol. 13, no. 1  |h illus., incl. 3 tables, sketch map 
856 |u urn:doi: 10.1127/0935-1221/01/0013-0041