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Fluid inclusions in granulites and eclogites from the Bergen Arcs, Caledonides of W. Norway

Published online by Cambridge University Press:  05 July 2018

T. Andersen ,
H. Austrheim  and
E. A. J. Burke
T. Andersen
Affiliation:
Mineralogisk-Geologisk Museum, University of Oslo, N-0562 Oslo 5, Norway
H. Austrheim
Affiliation:
Mineralogisk-Geologisk Museum, University of Oslo, N-0562 Oslo 5, Norway
E. A. J. Burke
Affiliation:
Instituut vor Aardwetenschappen, Vrije Universiteit, Amsterdam, The Netherlands
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Abstract

The Grenvillian granulite-facies complex on Holsnøy island, Bergen Arcs, W. Norway, has been metamorphosed at eclogite-facies conditions during the Caledonian orogeny (ca. 425 Ma). The granulite-eclogite facies transition takes place along shear zones and fluid pathways. Mineral thermobarometry indicates PT conditions of 800–900°C and 8–10 kbar for the Proterozoic granulite facies metamorphism and 700–800°C and 16–19 kbar for the eclogite-forming event. Quartz in the granulite facies complex contains CO2 fluid inclusions with less than 2.5 mole percent N2; the molar volumes are compatible with the PT conditions of the Proterozoic granulite metamorphism. Quartz in pegmatitic quartz + omphacite and quartz + phengite/paragonite veins coeval with shear-zone eclogites contain N2 ± CO2 fluid inclusions. Combined laser Raman microanalysis and microthermometry show that the least disturbed inclusions have XCO2 = 0.1–0.3, and molar volumes less than 40 cm3/mole, which may agree with the PT conditions during Caledonian high-pressure metamorphism. Younger, low-density N2 and N2-H2O fluid inclusions are the results of decrepitation and redistribution of early inclusions during the retrograde PT evolution of the eclogites.

Keywords

granuliteeclogitefluid inclusionscarbon dioxidenitrogenBergen ArcsNorway
Type
Magmatic/metamorphic environment
Information
Mineralogical Magazine , Volume 54 , Issue 375 , June 1990 , pp. 145 - 158
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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