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The Blackstones Bank igneous complex; geochemistry and crustal context of a submerged Tertiary igneous centre in the Scottish Hebrides

A. P. Dickin and G. P. Durant
The Blackstones Bank igneous complex; geochemistry and crustal context of a submerged Tertiary igneous centre in the Scottish Hebrides
Geological Magazine (March 2002) 139 (2): 199-207

Abstract

The Blackstones Bank, approximately 60 km WSW of Mull, is a submarine plutonic complex. Geochemical and isotopic analysis of gabbros, microgabbros and basic dykes shows that the magmas interacted strongly with crustal rocks during their emplacement. The Blackstone rocks have crustal signatures resembling the Proterozoic basement and cover rocks of W Islay, rather than evidence of any interaction with Archaean basement (despite Blackstones Bank lying to the W of the line of the Great Glen fault). It is therefore inferred that early Proterozoic crust extends to the W of the Great Glen fault at this point on the Scottish continental shelf. When combined with published evidence from the Rockall bank and the occurrence of similar isotopic signatures in Tertiary igneous rocks. E of the Loch Gruinard fault, the new data constrain the location of an Archaean-Proterozoic crustal suture to a WNW trajectory cutting across the continental shelf of NW Britain.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 139
Serial Issue: 2
Title: The Blackstones Bank igneous complex; geochemistry and crustal context of a submerged Tertiary igneous centre in the Scottish Hebrides
Affiliation: McMaster University, School of Geography and Geology, Hamilton, ON, Canada
Pages: 199-207
Published: 200203
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 24
Accession Number: 2002-074839
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N56°15'00" - N56°40'00", W06°30'00" - W05°40'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200223
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