Evolution of metamorphic volatiles during exhumation of microdiamond-bearing granulites in the Western Gneiss Region, Norway

Article Abstract:

The evolution of metamorphic volatiles in microdiamond-bearing-rocks during rapid exhumation in the deeply subducted continental lithosphere of Western Gneiss Region, Norway, was investigated using fluid-inclusion and microprobe analyses. Volatiles composed of N2 + CO2 + magnesian calcite characterize the ambient metamorphic environment between Caledonian high- and ultrahigh-pressure metamorphism. Thermodynamic modelling of the volatiles demonstrate that the observed metamorphic volatile evolution was attainable only if oxygen fugacity increased relative to the oxygen buffer.

Research, Norway, Rocks, Metamorphic, Metamorphic rocks, Calcite, Granulite, Metamorphism (Geology)

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Evolution of the Skaergaard magma: evidence from crystallized melt inclusions

Article Abstract:

The chemistry of aggregate grains present in cumulus plagioclase from the middle zone of the Skaergaard intrusion in Greenland suggest a new model of fractionation of the Skaergaard melt. These grains contain clino-pyroxene, minerals of Fe-Ti oxide, apatite, K-feldspar, biotite and amphibole. The grains are likely inclusions from the Skaergaard intrusion. Analysis indicates that during the crystallization of the middle zone, the melt was enriched in iron but the silica content remained the same.

Magmatism

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Methane-bearing, aqueous, saline solutions in the Skaergaard intrusion, east Greenland

Article Abstract:

Fluids in the Skaergaard intrusion are characterized. Analysis of fluid inclusions found in quartz, apatite and feldspars in gabbroic pegmatites show that a late-magmatic, methane-bearing aqueous saline solution was formed during the final stages of crystallization in the Skaergaard intrusion. Moreover, these fluids have an important role in pegmatite genesis and in metasomatism of the cumulates.

Greenland

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