| Computer Code: |
CFCO |
Preferred Map Code: |
symb |
| Status Code: |
Full |
| Age range: |
Ordovician Period (O)
— Ordovician Period (O) |
| Lithological Description: |
Layered cumulate gabbros and quartz-gabbros, forming the Mosedale Intrusions which have a calc-alkaline/transitional to tholeiitic composition, microgabbro, microgranite with apatite-bearing iron-rich microdiorite, micromonzodiorite and microgranite zones forming the tholeiitic Carrock Intrusions, quartz-phyric rhyolite of the Harestones Rhyolite, and a microgranite named the Iron Crag Microgranite. Several component intrusions have Ordocician radiometric ages (Mosedale Gabbros, Carrock intrusions). |
| Definition of Lower Boundary: |
Not defined. |
| Definition of Upper Boundary: |
Not defined. |
| Thickness: |
A near-vertical, sheet-like mass of about 8.5 sq. km emplaced at the junction between the Skiddaw Group and the Eycott Volcanic Group. |
| Geographical Limits: |
Carrock Fell, Cumbria. |
| Parent Unit: |
Lake District Ordovician Mafic Plutonic Suite (LDMP)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Carrock Fell |
| Reference(s): |
| Hunter, R H, 1980. The petrology and geochemistry of the Carrock Fell Gabbro-granophyre Complex, Cumbria. (University of Durham: PhD thesis.) |
| Millward, D. 2002. Early Palaeozoic magmatism in the English Lake District. Proceedings of the Yorkshire Geological Society, Vol. 54, Part 2, 65-93. |
| Stephenson, D, Bevins, R E, Millward, D, Highton, A J, Parsons, I, Stone, P and Wadsworth, W J. 1999. Caledonian igneous rocks of the British Isles. (Peterborough: Joint Nature Conservation Committee.) |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E023
|
