Computer Code: |
SCOMD |
Preferred Map Code: |
notEntered |
Status Code: |
Index Level |
Age range: |
Paleoproterozoic Era (AL)
— Paleoproterozoic Era (AL) |
Lithological Description: |
[Obsolete: use SCOUR] 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: |
none recorded or not applicable
|
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
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