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Investigations of small intrusions in southern Scotland

By D.C. Cooper, M.E. Parker and P.M. Allen

Abstract

Sixteen small intrusions and one mineral occurrence\ud were examined briefly for indications of disseminated\ud mineralisation. Stream sediment and\ud panned concentrate samples were collected from\ud streams crossing some of the intrusions to\ud supplement existing coverage, and geophysical\ud surveys were conducted over Priestlaw, Cockburn\ud Law and Lamberton Moor. Rock samples collected\ud at some of the localities were analysed for major\ud and trace elements.\ud The intrusive rocks range in composition from\ud granite to diorite and in grain size from hypabyssal\ud to plutonic types. The larger intrusions at Portencorkrie,\ud Priestlaw and Cockburn Law are zoned.\ud Hydrothermal alteration, in places with associated\ud pyrite, was recorded at Mains of Dhuloch,\ud Mochrum, Priesthope, Lamberton Moor, Broad\ud Law, Glenluce, Priestlaw, Cockburn Law and Mull\ud of Galloway, and significant copper enrichment\ud was recorded at the last four of these. It is\ud concluded, however, that in no case is there a\ud likelihood of there being porphyry copper style\ud mineralisation at or near surface. An old copper\ud mine at Tonderghie (Burrow Head) worked a vein\ud system along a fault within Silurian sedimentary\ud rocks

Topics: Earth Sciences
Publisher: Institute of Geological Sciences
Year: 1982
OAI identifier: oai:nora.nerc.ac.uk:11854

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