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
Type Section  Great Cockup. 
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