The BGS Lexicon of Named Rock Units — Result Details

Bassenthwaite Diorite Intrusions

Computer Code: BADIN Preferred Map Code: notEntered
Status Code: Full
Age range: Ordovician Period (O) — Ordovician Period (O)
Lithological Description: A porphyritic, horneblende-diorite and microdiorite, dolerite and olivine-augite hornblendite. Radiometric age: 458 +/- 9 Ma (K-AR whole rock) (Rundle, 1979)
Definition of Lower Boundary: Not defined.
Definition of Upper Boundary: Not defined.
Thickness: Plugs and sheet-like masses emplaced into the Skiddaw Group.
Geographical Limits: In the outcrop area of the Skiddaw Group, mainly between Cockermouth and Keswick, Cumbria, and also in Black Combe, Cumbria.
Parent Unit: Lake District Ordovician Minor Intrusion Suite (LDOMI)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Great Cockup. 
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. 
Fortey, N J, Cooper, A H, Henney, P J, Colman,T and Nancarrow, P H A. 1994. Appinitic intrusions in the English Lake District. Mineralogy and Petrology, Vol. 51, p. 355-375. 
Eastwood,T, Hollingworth, S E, Rose, W C C and Trotter, F M. 1968. Geology of the country around Cockermouth and Caldbeck. Memoir of the Geological Survey of Great Britain, England and Wales, Sheet 23. 
Rundle, C C, 1979. Ordovician intrusions in the English Lake District. Journal of the Geological Society of London, Vol.136, 29-38. 
Johnson, E W, Soper, N J, Burgess, I C, Ball, D F, Beddoe-Stephens, B, Carruthers, R M, Fortey, N J, Hirons, S, Merritt, J W, Millward, D, Roberts, B, Walker, A B and Young, B. 2001. Geology of the country around Ulverston. Memoir of the British Geological Survey, England and Wales, Sheet 48. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E023 E029