The BGS Lexicon of Named Rock Units — Result Details

Carrock Gabbro-Microgranite Intrusions

Computer Code: CFCOC Preferred Map Code: notEntered
Status Code: Full
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: A microgabbro, cutting the main mass of micrographic microgranite, a narrow marginal zone of apatite-bearing, iron-rich gabbro, microdiorite, micromonzodiorite and microgranite. Radiometric age: microgranite 452.4 +/- 4.1 Ma (U-Pb, zircon) (Millward, D and Evans, J A, 2003.)
Definition of Lower Boundary: Not defined.
Definition of Upper Boundary: Not defined.
Thickness: A near-vertical sheet like mass emplaced with the Carrock Fell Complex.
Geographical Limits: Carrock Fell, Cumbria.
Parent Unit: Carrock Fell Complex (CFCO)
Previous Name(s): Carrock Granophyre (-764)
Carrock Diabase (-3915)
Carrock Gabbro-Microgranite Division (-2682)
Carrock Series (-2683)
Alternative Name(s): none recorded or not applicable
Type Area  Carrock Fell. Millward (1999). 
Reference Section  Further Gill Sike. Millward (1999). 
Millward, D. 2002. Early Palaeozoic magmatism in the English Lake District. Proceedings of the Yorkshire Geological Society, Vol. 54, Part 2, 65-93. 
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. 
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.) 
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. 
Millward, D and Evans, J A. 2003. U-Pb chronology and duration of Upper Ordovician magmatism in the English Lake District. Journal of the Geological Society of London, Vol. 160, 773-781. 
Hunter, R H, 1980. The petrology and geochemistry of the Carrock Fell Gabbro-granophyre Complex, Cumbria. (University of Durham: PhD thesis.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used: