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A melilite-bearing high-temperature calcic skarn, Camasunary Bay, Isle of Skye

A. D. Beard and S. M. Drake
A melilite-bearing high-temperature calcic skarn, Camasunary Bay, Isle of Skye
Scottish Journal of Geology (2007) 43, Part 1: 57-67

Abstract

The occurrence of high-temperature calcic skarns is relatively rare, with around 30 being reported worldwide. Here, we report on a newly discovered occurrence of a melilite-bearing high-temperature calcic skarn at Camasunary Bay, Isle of Skye. The contact metamorphism was caused by the intrusion of the Cuillin Hills gabbro and the later intrusion of the Coire Uaigneich granophyre. The calcic skarn consists of a high-temperature assemblage of wollastonite, akermanite-gehlenite, vesuvianite, tilleyite, spurrite, andradite-grossular garnet, monticellite and perovskite. It also includes the very rare Zr-rich garnet kimzeyite and baghdadite (Ca (sub 3) (Zr,Ti)Si (sub 2) O (sub 9) ), indicating transfer of Zr, Ti and other incompatible element-rich fluids derived from the hydrous Coire Uaigneich granophyre. The calcic skarn contains numerous cherty nodules and stringers, which bear a remarkable resemblance to the Cambrian-Ordovician dolostone exposures observed in other parts of Skye, suggesting that the protolith was originally an impure dolomite. The nature of the contact between the calcic skarn and surrounding Torridonian sedimentary rocks could not be directly observed, but elsewhere on Skye this contact is the Kishorn Thrust plane. This has implications for the simplified tectonic map accompanying the British Geological Survey map of Broadford (Sheet 71W), which now requires modification.


ISSN: 0036-9276
EISSN: 2041-4951
Coden: SJGEAX
Serial Title: Scottish Journal of Geology
Serial Volume: 43, Part 1
Title: A melilite-bearing high-temperature calcic skarn, Camasunary Bay, Isle of Skye
Affiliation: University of London, Birbeck School of Earth Sciences, London, United Kingdom
Pages: 57-67
Published: 2007
Text Language: English
Publisher: Scottish Academic Press, Edinburgh, United Kingdom
References: 37
Accession Number: 2008-071039
Categories: Mineralogy of silicatesIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables, geol. sketch map
N57°00'00" - N57°40'00", W06°45'00" - W05°40'00"
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: 200819
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