The BGS Lexicon of Named Rock Units — Result Details
Eskdale Intrusions
Computer Code: | ESK | Preferred Map Code: | notEntered |
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Status Code: | Full | ||
Age range: | Caradoc Series (O4) — Caradoc Series (O4) | ||
Lithological Description: | A pink, medium-grained muscovite granite, aphyric and porphyritic microgranite, coarse-grained granite, medium-grained granodiorite, microgranodiorite, biotite-rich granodiorite, and quartz-mica greisen locally containing topaz and quartz-andalusite rock associated with granite. The age of the granite is 450 +/- 3 Ma (U-Pb, zircon) (Hughes et al, 1996) | ||
Definition of Lower Boundary: | Two sheet-like masses of granite and granodiorite cropping out over 53 and 23 sq. km respectively, and intruded into the Skiddaw Group and the Borrowale Volcanic Group. | ||
Definition of Upper Boundary: | Not defined. | ||
Thickness: | Unspecified. | ||
Geographical Limits: | Corney Fell to Wasdale, western Lake District. | ||
Parent Unit: | Lake District Ordovician Felsic Plutonic Suite (LDFP) | ||
Previous Name(s): | Ennerdale Granite [Obsolete Name and Code: Use ESK]
(-4030)
Eskdale Intrusion [Obsolete Name and Code: Use ESK] (-2174) Eskdale Intrusion, Granodiorite [Obsolete Code: Use ESK + Rock Type] (ESGD) Eskdale Intrusion, Microgranite [Obsolete Code: Use ESK + Rock Type] (ESGM) Eskdale Intrusion, Granite [Obsolete Code: Use ESK + Rock Type] (ESGR) Eskdale Pluton [Obsolete Name and Code: Use ESK] (-2787) Eskdale Granodiorite (-894) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Area | Beckfoot Quarry, Eskdale for the granite intrusion. Young (in Stephenson et al., 1999). | ||
Type Area | Waberthwaite (Broad Oak) Quarry,west Cumbria for the granodiorite Young (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. | |||
Young, B. 1999. Beckfoot Quarry. 194-195 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. 2002. Early Palaeozoic magmatism in the English Lake District. Proceedings of the Yorkshire Geological Society, Vol. 54, Part 2, 65-93. | |||
Young, B. 1999. Waberthwaite Quarry. 196-198 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. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E047 E038 E048 E037 |