The BGS Lexicon of Named Rock Units — Result Details

Badcall Meta-Clinopyroxene-Norite Subswarm

Computer Code: BMCN Preferred Map Code: notEntered
Status Code: Full
Age range: Palaeoproterozoic Era (AL) — Palaeoproterozoic Era (AL)
Lithological Description: The Badcall meta-clinopyroxene-norites form a small number of dykes in Assynt and near Scourie. They are coarse-grained and have distinct chilled margins. They have a primary mineralogy of plagioclase-hypersthene-clinopyroxene-biotite plus minor olivine or quartz, with the clinopyroxenes having been replaced by amphiboles at the margins of some dykes. They have lower Ti, but higher Mg and Cr contents than the dolerite dykes of the Scourie Dyke Swarm.
Definition of Lower Boundary: N/a
Definition of Upper Boundary: N/a
Thickness: 1m - 100m
Geographical Limits: The dykes of the Badcall Meta-clinopyroxene-norite Subswarm are found in a few localities in Assynt and at Badcall.
Parent Unit: Scourie Dyke Swarm (SCOUR)
Previous Name(s): Noritic Dykes Of The Scourie Dyke Swarm (-4476)
Scourie Metaclinopyroxene-Norite Subswarm [Obsolete Name And Code: Use BMCN] (SCOMN)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  About 200m west of Upper Badcall, Sutherland O'Hara, 1962. 
Reference(s):
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. 
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.] 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S107