The BGS Lexicon of Named Rock Units — Result Details

Scourie Metadolerite Subswarm [Obsolete Name And Code: Use SCOUR]

Computer Code: SCOMD Preferred Map Code: notEntered
Status Code: Index Level
Age range: Palaeoproterozoic Era (AL) — Palaeoproterozoic Era (AL)
Lithological Description: Includes the majority of the dykes of the Scourie Dyke Swarm. The metadolerites form dykes of a variety of thicknesses, typically with a roughly northwest-southeast trend. The dykes have a primary mineralogy of plagioclase - clinopyroxene - titanomagnetite together with variable amounts of orthopyroxene, hornblende, biotite and quartz, although most have been metamorphosed at amphibolite facies, with replacement of much of the primary mineralogy. Cross-cutting relationships are rare, but the subswarm probably includes dykes representing more than one phase of intrusion.
Definition of Lower Boundary: Contacts are cross-cutting, and modified by subsequent metamorphism.
Definition of Upper Boundary: N/A.
Thickness: From about 50 cm to 50 m thick.
Geographical Limits: Located throughout most of the outcrop of the Lewisian Gneiss Complex on mainland Scotland.
Parent Unit: Scourie Dyke Swarm (SCOUR)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Poll Eorna, Scourie. O' Hara, 1961. 
Reference(s):
Tarney, J. and Weaver, B L. 1987. Mineralogy, petrology and geochemistry of the Scourie dykes: petrogenesis and crystallization processes in dykes intruded at depth. p. 217-233 in Evolution of the Lewisian and Comparable Precambrian High Grade Terrains. Park, R.G. and Tarney, J. (eds.) Geological Society Special Publication No. 27. 
O'Hara, M J. 1962. Some intrusions in the Lewisian Complex near Badcall, Sutherland. Transactions of the Edinburgh Geological Society, Vol.19, 201-207. 
Tarney, J. 1973. The Scourie Dyke Suite and the nature of the Inverian event in Assynt. 105-117 in Park, R G and Tarney, J (editors), The Early Precambrian of Scotland and related rocks of Greenland. [University of Keele.] 
Weaver, B L and Tarney, J. 1981. The Scourie Dyke Suite: Petrogenesis and Geotechnical Nature of the Proterozoic Sub-Continental Mantle. Contributions to Mineralogy and Petrology, Vol.78, 175-188. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S101 S102 S107 S108