The BGS Lexicon of Named Rock Units — Result Details

Mosedale Gabbros

Computer Code: CFCOM Preferred Map Code: notEntered
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Layered cumulate gabbros, with zones rich in xenoliths a zone of poikilitic leucogabbro, gabbro and hypersthene gabbro, cut by biotite quartz-gabbro. Radiometric age 468 +/- 9 Ma (K-Ar whole rock) (Rundle, 1979). Geochemically similar to the Eycott Volcanic Group, with which it is considered to be associated (Hunter, 1980).
Definition of Lower Boundary: Not defined.
Definition of Upper Boundary: Not defined.
Thickness: A near-vertical sheet-like mass, emplaced at the junction between the Skiddaw Group and the Eycott Volcanic Group.
Geographical Limits: Carrock Fell, Cumbria.
Parent Unit: Carrock Fell Complex (CFCO)
Previous Name(s): Carrock Fell Complex [Mosedale Division] (-4533)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Carrock Fell. Millward (1999). 
Reference(s):
Millward, D, Carrock Fell. 198-204 in Stephenson, D, Bevins, R E, Millward, D, Highton, A J, Parsons, I, Stone, P and Wadsworth, W J. 1999. Caledonian Igneous Rocks of Great Britain. Geological Conservation Review Vol. 17. (Peterborough: Joint Nature Conservation Committee.) 
Millward, D. 2002. Early Palaeozoic magmatism in the English Lake District. Proceedings of the Yorkshire Geological Society, Vol. 54, Part 2, 65-93. 
Rundle, C C, 1979. Ordovician intrusions in the English Lake District. Journal of the Geological Society of London, Vol.136, 29-38. 
Hunter, R H, 1980. The petrology and geochemistry of the Carrock Fell Gabbro-granophyre Complex, Cumbria. (University of Durham: PhD thesis.) 
Hunter, R H and Bowden, N, 1990. Itinerary 3: The Carrock Fell Igneous Complex. 57-67 in Moseley, F (ed.) The Lake District. Geologists' Association Guide. 
Harker, A, 1894. Carrock Fell: A study in the variation of igneous rock masses. Part 1. The Gabbro. Quarterly Journal of the Geological Society, London, Vol.50, 311-337. 
Harris, P and Dagger, G W, 1987. The intrusion of the Carrock Fell Gabbro Series (Cumbria) as a sub-horizontal tabular body. Proceedings of the Yorkshire Geological Society, Vol.46, 371-380. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E023