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GEOREF RECORD

Garnet-bearing olivine-websterite within the eastern Glenelg Lewisian of the Glenelg Inlier, NW Highlands

J. R. Rawson, D. A. Carswell and D. Smallwood
Garnet-bearing olivine-websterite within the eastern Glenelg Lewisian of the Glenelg Inlier, NW Highlands
Scottish Journal of Geology (2001) 37, Part 1: 27-34

Abstract

This paper documents the first identified occurrence of a garnet-bearing olivine-websterite rock within the Eastern Glenelg Lewisian of the Glenelg inlier. Bulk chemistries of the rock and associated websterites are comparable with komatiite or ultrabasic intrusive rocks. However, comparison with zoned ultrabasic-basic gneisses from the Scourie area suggests that the rock may be genetically linked to associated eclogites and represents a cumulate from a magma of basaltic composition. Geothermobarometry indicates that the rock equilibrated at eclogite facies P-T conditions: 20+ or -3 kbar, 730+ or -50 degrees C. It is suggested that the magmatic protolith for this rock was emplaced during the Scourian, and from the textural evidence of the pyroxene grains, experienced granulite facies conditions followed by cooling prior to being subject to eclogite facies metamorphism during Grenville events.


ISSN: 0036-9276
EISSN: 2041-4951
Coden: SJGEAX
Serial Title: Scottish Journal of Geology
Serial Volume: 37, Part 1
Title: Garnet-bearing olivine-websterite within the eastern Glenelg Lewisian of the Glenelg Inlier, NW Highlands
Affiliation: University of Sheffield, Environmental and Geological Sciences, Sheffield, United Kingdom
Pages: 27-34
Published: 2001
Text Language: English
Publisher: Scottish Academic Press, Edinburgh, United Kingdom
References: 31
Accession Number: 2002-048421
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N57°07'60" - N57°07'60", W05°22'00" - W05°22'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200216
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