Petrogenesis of the anorthosite dyke swarm of Tromso, North Norway; experimental evidence for hydrous anatexis of an alkaline mafic complex

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doi: 10.1093/petrology/43.6.943
Authors:Selbekk, Rune S.; Skjerlie, Kjell P.
Author Affiliations:Primary:
University of Tromso, Department of Geology, Tromso, Norway
Volume Title:Journal of Petrology
Source:Journal of Petrology, 43(6), p.943-962. Publisher: Oxford University Press, Oxford, United Kingdom. ISSN: 0022-3530
Publication Date:2002
Note:In English. 54 refs.; illus., incl. 6 tables, sketch map
Summary:The 456 ± 4 m.y. Skattφra migmatite complex in the N Norwegian Caledonides consists of metagabbros and amphibolites net-veined by numerous ne-normative anorthositic and leucodioritic dykes. Plagioclase (An20-50) forms 85-100% of these dykes and the leucosome, but amphibole is generally present in amounts ≤ 15%. Melting experiments suggest that anorthositic liquids could have been formed by anatexis of ne-normative mafic rocks in the presence of an H2O-bearing fluid, to produce a variety of melt compositions from tonalite to anorthosite. The glasses produced experimentally have ≤ 92 wt.% plagioclase component. The anothositic dykes probably formed by anatexis of an H2O-bearing saline fluid phase at ∼ 1.0 GPa and 900-950°C to give highly mobile melts, explaining the high abundance of dykes. [R.A.H.]
Sections:Experimental mineralogy
Subjects:Alkalic composition; Anatexis; Anorthosite; Complexes; Dike swarms; Experimental studies; Genesis; Igneous rocks; Mafic composition; Metamorphic rocks; Migmatites; Plutonic rocks; Caledonides; Europe; Northern Norway; Norway; Scandinavia; Western Europe; Skattora Complex; Tromso Norway
Coordinates:N694200 N694200 E0190000 E0190000
Abstract Numbers:02M/3978
Record ID:2003025032
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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