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GEOREF RECORD

Lamprophyric magmatism in the Sleat Group (Torridonian), Kyle of Lochalsh; Torridonian sill or ash-flow tuff, or Permo-Carboniferous intrusion?

R. A. Batchelor
Lamprophyric magmatism in the Sleat Group (Torridonian), Kyle of Lochalsh; Torridonian sill or ash-flow tuff, or Permo-Carboniferous intrusion?
Scottish Journal of Geology (2008) 44 (1): 35-41

Abstract

A prominent bed which is concordant with its host Sleat Group (Torridonian) rocks near Kyle of Lochalsh, Highland Region, NW Scotland, has been categorized as an alkaline lamprophyre (sannaite). It consists mostly of a yellowish-grey crumbly material with marginal layers of competent rock which exhibit flow textures reminiscent of ash-flow tuffs. A central facies displays trachytic texture. The presence of sanidine, flow textures and pseudomorphed skeletal olivine phenocrysts supports a volcanic origin. The rock's NE-SW trend is incompatible with local Tertiary NW-SE dyke swarms. While the evidence for this rock being a contemporary late-Mesoproterozoic ash-flow tuff or sill, or a Permo-Carboniferous sill may appear equivocal, the weight of evidence favours a Torridonian intrusive origin, contemporary with the Gardar Igneous Province of Greenland.


ISSN: 0036-9276
EISSN: 2041-4951
Coden: SJGEAX
Serial Title: Scottish Journal of Geology
Serial Volume: 44
Serial Issue: 1
Title: Lamprophyric magmatism in the Sleat Group (Torridonian), Kyle of Lochalsh; Torridonian sill or ash-flow tuff, or Permo-Carboniferous intrusion?
Author(s): Batchelor, R. A.
Affiliation: University of Saint Andrews, School of Geography and Geosciences, St. Andrews, United Kingdom
Pages: 35-41
Published: 2008
Text Language: English
Publisher: Scottish Academic Press, Edinburgh, United Kingdom
References: 33
Accession Number: 2009-010061
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N57°04'60" - N57°20'50", W05°49'10" - W05°29'50"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200906
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