A gabbro to eclogite transition on Flemsøy, Sunmore, western Norway

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doi: 10.1016/0009-2541(85)90125-1
Authors:Møork Mai Britt E.
Author Affiliations:Primary:
Mineral.-Geol. Mus., Oslo, Norway
Other:
Tech. Univ. Berlin, Inst. Angew. Geophys., Petrol. und Lagerstättenforsch., Federal Republic of Germany
Eidg. Tech. Hochsch. Zentrum, Inst. Kristall. und Petrogr., Switzerland
Volume Title:Chemistry and petrology of eclogites
Volume Authors:Smith, David C., editor; Franz, Gerhard; Gebauer, Dieter
Source:Chemical Geology, 50(1-3), p.283-310; First international eclogite conference, Clermont-Ferrand, France, Aug. 31-Sept. 2, 1982, edited by David C. Smith, Gerhard Franz and Dieter Gebauer. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1985
Note:In English
Summary:The migmatitic gneisses on the Nordoyane Islands enclose abundant inclusions of coronitic gabbros and different types of country- rock eclogites. Gabbros on Flemsoy show a prograde, stepwise transition to eclogite via a transitional stage in which garnet and orthopyroxene form coronas between igneous olivine and sodic plagioclase. Eclogitization proceeds by a complex set of continuous and discontinuous reactions: orthopyroxene and spinel form as transient phases but are consumed in various omphacite-forming reactions during eclogite recrystallization. Relict igneous clinopyroxene shows a continuous increase in Jd content, while garnet becomes less calcic and more homogeneous from the corona stage to recrystallized eclogite. The reactions are strongly diffusion-controlled and have been enhanced locally by oxidation, the presence of a fluid phase and deformation, while low-strain areas of the gabbros remained coronitic. Whole-rock chemistry, mineral parageneses and calculated P-T conditions are similar for the gabbro-eclogites and two types of country-rock eclogites. P estimates are approx 15-20 kbar while 053KdGar/Cpx values suggest maximum T values of approx 750 + or - 60°C for the eclogite metamorphism in the area. [J.M.H.]
Subjects:Country rocks; Diffusion; Eclogite; Gabbros; Genesis; Igneous rocks; Inclusions; Metamorphic rocks; Metamorphism; Mineral composition; Oxidation; P-T conditions; Paragenesis; Petrology; Plutonic rocks; Prograde metamorphism; Recrystallization; Whole rock; Europe; Norway; Scandinavia; Western Europe; Evolution; Flemsoy; Nordoyane Islands; Sunmore; Western Norway
Abstract Numbers:86M/2527
Record ID:1985067152
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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