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Eclogites and related high-pressure rocks from North-east Greenland
Journal article   Open access

Eclogites and related high-pressure rocks from North-east Greenland

Jane A Gilotti
Rapport - Gronlands Geologiske Undersogelse (1964), Vol.162, pp.77-90
1994
DOI: 10.34194/rapggu.v162.8250
url
https://doi.org/10.34194/rapggu.v162.8250View
Published (Version of record) Open Access

Abstract

Eclogite, garnet clinopyroxenite, garnet websterite and websterite within Precambrian basement gneisses in the Caledonian fold belt attest to widespread high-P metamorphism from approximately 76 degrees 40' to 78 degrees N. Eclogites with the assemblage omphacite + garnet + or - quartz + or - rutile are common, and formed at minimum P of 20-25 kbar and T 600-900 degrees C, and hence are the medium-T type typically formed in over-thickened crust during continent collision. Preliminary geochronology, regional correlations and field relations indicate formation during the Caledonian orogeny.
 agmatite Arctic region Caledonides clinopyroxenite correlation crystal chemistry East Greenland eclogite electron probe data exhumation gneisses Greenland high pressure Igneous and metamorphic petrology igneous rocks inclusions major elements metamorphic rocks metamorphism migmatites mineral assemblages Northern Greenland P-T conditions petrography plutonic rocks pressure protoliths pyroxenite retrograde metamorphism Skaerfjorden Complex spectra tectonics trace elements ultramafics websterite X-ray fluorescence spectra xenoliths

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