Discontinuities between picritic and crinanitic units in the Shiant Isles sill : Evidence of multiple intrusion
By: Gibb, F. G. F
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Contributor(s): Henderson, C. M. B.
Material type: 
ArticleDescription: 127-137p ; Illustration; ; Colour illustration.Subject(s): Discontinuities - Picritic units - Shiant Isles sill - Northwest Scotland | Discontinuities - Crinanitic units - Shiant Isles sill - Northwest Scotland | Evidence - Intrusion - Northwest Scotland | Petrology - Northwest Scotland | Structure - Classic tertiary Shiant Isles sill - Northwest Scotland
In:
Geological magazine : Vol. 126 Iss. 1-6 Year. 1989Summary: Abstract
Two internal discontinuities are described from the Tertiary, Shiant Isles sill (northwest Scotland). The lower discontinuity separates picrite from overlying picrodolerite and the recently discovered upper discontinuity separates picrite from underlying crinanite. The sill is thus divided into an inner, strongly differentiated, picrodolerite–crinanite unit and outer picritic units. The lower discontinuity is slightly transgressive with respect to the picrite. The discontinuities are interpreted as the contacts between an earlier-intruded picritic sill (about 30 m thick) and a slightly later-intruded, much thicker, crinanitic sill. The Shiant Isles main sill is therefore a multiple intrusion.
| Item type | Current location | Collection | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|---|
Article
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Library and Information Centre Periodical Section | Bound Journal Collection | Not for loan | 002528_17 | ||
Serials/Scientific Journal
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Library and Information Centre Periodical Section | Bound Journal Collection | 550 GEO (Browse shelf) | Available | 002528 |
Abstract
Two internal discontinuities are described from the Tertiary, Shiant Isles sill (northwest Scotland). The lower discontinuity separates picrite from overlying picrodolerite and the recently discovered upper discontinuity separates picrite from underlying crinanite. The sill is thus divided into an inner, strongly differentiated, picrodolerite–crinanite unit and outer picritic units. The lower discontinuity is slightly transgressive with respect to the picrite. The discontinuities are interpreted as the contacts between an earlier-intruded picritic sill (about 30 m thick) and a slightly later-intruded, much thicker, crinanitic sill. The Shiant Isles main sill is therefore a multiple intrusion.
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