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A reconnaissance geochemical drainage survey of the Criffel-Dalbeattie granodiorite complex and its environs

By R.C. Leake, M.J. Brown, A.R. Date and T.K. Smith

Abstract

Regional geochemical reconnaissance by stream sediments and panned\ud concentrates was undertaken over an area of 850 km\ud 2\ud of south-west Scotland.\ud Rocks of Ordovician to Permian age are exposed within the area but the major\ud part is occupied by the Criffel-Dalbeattie granodiorite complex.\ud Multi-element analysis of the samples collected demonstrates\ud patterns of trace element distribution related to the geology and\ud Broad-scale patterns in the distribution of some elements reflect compositional\ud anumber of\ud mineralisation.\ud variations in both the Lower Palaeozoic turbidite sequence and the Criffel-\ud Dalbeattie granodiorite complex, both of which may be sub-divided into specific\ud units on the basis of the geochemical data.\ud The follow-up of copper anomalies in drainage samples from the Black\ud Stockarton Moor area led to the discovery of porphyry-style copper mineralisation\ud within an arcuate belt at least 5 km by 1 km within the Black Stockarton Moor\ud subvolcanic complex and of related disseminated copper mineralisation at Screel\ud Burn. The area to the west of the Criffel-Dalbeattie plutonic complex is also\ud characterised by relatively high boron levels in stream sediments reflecting\ud the widespread occurrence of tourmaline both in association with and peripheral\ud to the copper mineralisation. Vein mineralisation, usually containing baryte\ud in addition to base.metals, is also identifiable from the drainage survey at\ud the eastern margin of the Criffel-Dalbeattie granodiorite; in association with\ud the Lower Carboniferous rocks along the Solway coast; and within the Lower\ud Palaeozoic turbidites in the west of the area

Publisher: Institute of Geological Sciences
Year: 1977
OAI identifier: oai:nora.nerc.ac.uk:10676

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