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
Stratotypes:
Type Area  Carrock Fell. Millward (1999). 
Reference Section  Further Gill Sike. Millward (1999). 
Reference(s):
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:
E023