The BGS Lexicon of Named Rock Units — Result Details

Ballantrae Ophiolite Complex

Computer Code: BX Preferred Map Code: BX
Status Code: Full
Age range: Tremadoc Series (O1) — Arenig Series (OR)
Lithological Description: Tectonically assembled complex consisting largely of sepentinised ultramafic rock and basaltic pillow lavas. The latter are associated with basaltic breccias and a range of volcaniclastic rocks, conglomerate, mudstone-supported melange and chert. Some of the sedimentary rocks contain a graptolite fauna. There are several generations of dolerite and gabbro intrusions, and tectonism has locally produced amphibolite and greenschist.
Definition of Lower Boundary: Not seen; speculatively a thrust contact on crystalline basement.
Definition of Upper Boundary: Major unconformity beneath the overlying sedimentary cover. Above different parts of the Complex this cover is assigned to the Barr and/or Ardmillan groups and/or the Old Red Sandstone.
Thickness: Highly speculative; at least several kilometres and possibly as much as 10km.
Geographical Limits: About 75 square kilometres between Girvan and Ballantrae, Ayrshire, southwest Scotland.
Parent Unit: Not Applicable (-)
Alternative Name(s): BALLANTRAE COMPLEX
Type Area  Coastal and inland sections, Ballantrae to Girvan, southwest Scotland. 
Type Area  Coastal section about 10km long between Kennedy's Pass and Bennane Head. 
Spray, J G and Williams, G D, 1980. The sub-ophiolite metamorphic rocks of the Ballantrae Igneous Complex, south-west Scotland. Journal of the Geological Society of London, Vol.137, 359-368. 
Bailey, E B and McCallien, W J, 1952. Ballantrae problems: historical review. Transactions of the Edinburgh Geological Society, Vol.15, 14-38. 
Wilkinson, J M and Cann, J R, 1974. Trace elements and tectonic relationships of basaltic rocks in the Ballantrae Igneous Complex, Ayrshire. Geological Magazine, Vol.III, 35-41. 
Balsillie, D, 1932. The Ballantrae Igneous Complex, south Ayrshire. Geological Magazine, Vol 69, 107-131. 
Williams, A, 1962. The Barr and Lower Ardmillan Series (Caradoc) of the Girvan district, southwest Ayrshire, with descriptions of the Brachiopoda. Memoir of the Geological Society of London, No.3. 
Bloxham, T W, 1954. Rodingite from the Girvan-Ballantrae Complex, Ayrshire. Mineral Magazine, Vol.30, 525-528. 
Stone, P and Rushton, A W A, 1983. Graptolite faunas from the Ballantrae Ophiolite Complex and their structural implications. Scottish Journal of Geology, Vol. 19, 297-310. 
Stone, P and Smellie, J L, 1988. Classical areas of British Geology: The Ballantrae area: a description of the solid geology of parts of 1:25 000 sheets NX 08, 18 and 19. [London: HMSO for British Geological Survey.] 
Church, W R and Gayer, R A, 1973. The Ballantrae ophiolite. Geological Magazine, Vol.110, 497-510. 
Stone, P and Smellie, J L, 2001. Geochemical characteristics and geotectonic setting of early Ordovician basalt lavas in the Ballantrae ophioloite, SW Scotland.Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.91, 539-555. 
Ingham, J K, 1978. Geology of a continental margin 2: Middle and Late Ordovician transgression, Girvan. "In" Crustal evolution in north western Britain and adjacent areas. 163-176. 
Greig, D C, 1971, British Regional Geology: The South of Scotland. (Edinburgh. H.M.S.O.). British Geological Survey. 
Bluck, B J, 1978. Geology of a continental margin 1: The Ballantrae Complex, 151-162. "In" Crustal evolution in north western Britain and adjacent regions. Bowes, D R, and Leake, B E. (editors). Geological Journal Special Issue, No.10. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S007 S008