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P-T and Fluid Evolution of the Angmagssalik “Charnockite” Complex, SE Greenland

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Fluid Movements — Element Transport and the Composition of the Deep Crust

Part of the book series: NATO ASI Series ((ASIC,volume 281))

Abstract

The Angmagssalik “charnockite” complex is a belt of Proterozoic orthopyroxene bearing metamorphic and igneous rocks situated within the central parts of the Nagssugtoqidian mobile belt of East Greenland. The oldest intrusive rock unit in the complex is a melagabbro, which may represent a pyroxene cumulate from a mafic melt. This unit is cross-cut by leuconorite (the most abundant unit in the complex) and by minor anorthosite and hypersthene-veins. The country rock of the intrusives is an amphibolite facies quartzofeldspathic garnet gneiss, which has developed opx-bearing (granulite facies) mineral assemblages near the intrusive contact, and which has been physically mobilized and intermixed with the intrusives.

Quartz and plagioclase in melagabbro contain primary and secondary pure CO2 inclusions, with accidentally trapped solid silicate and carbonate crystals. These inclusions have liquid homogenization temperatures in the range 0 to -20 °C. Pure CO2 is also characteristic for inclusions in plagioclase in the leuconorite and in the anorthosite veins. The inclusions in leuconorite are distinctly secondary, and have higher densities (homogenization temperatures ranging down to -30 °C). Secondary carbonic fluid inclusions in the country rock gneisses contain minor methane, and range in homogenization temperatures from +10 °C (garnet) to -10 °C (quartz, plagioclase).

Combined with mineral thermobarometry on cpx-opx, gnt-opx and gnt-bi assemblages, the fluid inclusion data suggest an interpretation of the cooling history and fluid evolution of the complex: Primary magmatic rocks crystallized in the middle-lower crust (P: 6–8 kbar, T: 1000–1100 °C). The higher density, secondary inclusions reflect isobaric coolingin the presence of CO2 as a free fluid phase. This fluid phase migrated into the country-rock gneisses, where interaction between rocks and fluid led to the evolution of dry, granulite facies mineral assemblages. In this process, the CO2 mixed with CH4-bearing fluids, or reacted with hydrous minerals to yield fluids with minor methane contents.

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Authors and Affiliations

  1. Mineralogisk-Geologisk Museum, Sarsgate 1, N-0562, Oslo 5, Norway

    T. Andersen & H. Austrheim

  2. Geologisk Museum, Øster Voldgade 5–7, DK-1350, København K, Denmark

    D. Bridgwater

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  1. T. Andersen
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  2. H. Austrheim
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  3. D. Bridgwater
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Editors and Affiliations

  1. Geological Museum, Øster Voldgade 5-7, DK-1350, Copenhagen K, Denmark

    David Bridgwater

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© 1989 Kluwer Academic Publishers

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Andersen, T., Austrheim, H., Bridgwater, D. (1989). P-T and Fluid Evolution of the Angmagssalik “Charnockite” Complex, SE Greenland. In: Bridgwater, D. (eds) Fluid Movements — Element Transport and the Composition of the Deep Crust. NATO ASI Series, vol 281. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0991-5_7

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  • DOI: https://doi.org/10.1007/978-94-009-0991-5_7

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-6935-9

  • Online ISBN: 978-94-009-0991-5

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