Archaean aluminous ultrabasic rocks with primary igneous textures from the Fiskenaesset region,southern West Greenland |
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| Authors: | CRL Friend DJ Hughes |
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| Institution: | Department of Geology, Portsmouth Polytechnic, Portsmouth, PO1 3QL, Hampshire ,Great Britain |
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| Abstract: | A series of spinel-dunites and spinel-pyroxenites is described from the Archaean amphibolite facies terrain of West Greenland. They occur in a disrupted layered sequence with some units reaching pegmatitic proportions and including intergrowths of spinel + olivine and spinel + orthopyroxene. Rare instances of spinel + olivine overgrown by spinel + orthopyroxene are observed which reveal the way-up of the sequence. The textures described are preserved as boudins within metamorphically layered and recrystallised spinel-olivine-orthopyroxene rocks and they clearly represent undeformed primary igneous assemblages. |
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