The BGS Lexicon of Named Rock Units — Result Details

Ennerdale Intrusion

Computer Code: ENIN Preferred Map Code: notEntered
Status Code: Full
Age range: Ordovician Period (O) — Ordovician Period (O)
Lithological Description: A medium-grained granophyric granite and microgranite, with zones of diorite, dolerite and hybridised rocks.
Definition of Lower Boundary: Not defined.
Definition of Upper Boundary: Not defined.
Thickness: A laccolith, about 1km thick, and with an area of about 53 sq. km intruded into the Skiddaw Group and the lower part of the Borrowdale Volcanic Group.
Geographical Limits: From Wasdale to Ennerdale, western Lake District.
Parent Unit: Lake District Ordovician Felsic Plutonic Suite (LDFP)
Previous Name(s): Ennerdale Intrusion, Diorite [Obsolete Code: Use ENIN + Rock Type] (ENDI)
Ennerdale Granophyre (-4028)
Ennerdale Intrusion, Granite [Obsolete Code: Use ENIN + Rock Type] (ENGR)
Ennerdale Intrusion, Granophyre [Obsolete Code: Use ENIN + Rock Type] (ENN)
Ennerdale Intrusion, Microdiorite [Obsolete Code: Use ENIN + Rock Type] (ENNR)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Bowness Knott, Ennerdale. Fettes (in Stephenson et al.,1999) 
Reference(s):
Hughes, R A, Evans, J A, Noble, S R, and Rundle, C C. 1996. U-Pb chronology of the Ennerdale and Eskdale intrusions supports sub-volcanic relationships with the Borrowdale Volcanic Group (Ordovician, English Lake District). Journal of the Geological Society, London, Vol. 153, p. 33-38. 
Fettes, D. 1999. Bowness Knott. 190-193 in Stephenson D, Bevins R E, Millward D, Highton A J, Parsons I, Stone P, and Wadsworth W J. Caledonian igneous rocks of the British Isles. (Peterborough: Joint Nature Conservation Committee.) 
Millward, D, Johnson, E W, Beddoe-Stephens, B, Young, B, Kneller, B C, Lee, M K, Fortey, N J, Allen, P M, Branney, M J, Cooper, D C, Hirons, S, Kokelaar, B P, Marks, R J, McConnell, B J, Merritt, J W, Molyneux, S G, Petterson, M G, Roberts, B, Rundle, C C, Rushton, A W A, Scott, R W, Soper, N J and Stone, P. 2000. Geology of the Ambleside district. Memoir of the British Geological Survey, England and Wales, Sheet 38. 
Woodhall, D G. 2000. Geology of the Keswick district. British Geological Survey Sheet Description, England and Wales, Sheet 29. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E038 E037 E029 E028