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A peridotitic komatiite from the Dalradian of Shetland

✍ Scribed by Derek Flinn; D. T. Moffat

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
516 KB
Volume
20
Category
Article
ISSN
0072-1050

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✦ Synopsis

Komatiite lavas occur in the Dunrossness Spilitic Group in southeast Shetland in the Cunningsburgh area. This metavolcanic group is the easternmost member of the East Mainland Succession of Shetland and probably the youngest. It overlies a thick succession of deepwater metasediments and metavolcanic rocks probably forming part of an extensional basin and has been correlated with a part of the upper Dalradian of Scotland. Komatiites are not common in rock sequences as young as this. Their eruption is thought to require tectonic and thermal conditions which have been unusual since Archean times. Such conditions could arise when the crust beneath an extensional basin splits to form a constructive margin.

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