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- Title
Geologic sources of sulphur at Dargall Lane (Galloway, Scotland)
- Authors
Giusti, L.
- Abstract
Dargall Lane is an acidic stream draining a moorland catchment in the Galloway Hills of southwest Scotland. This area has been receiving high atmospheric loadings of sulphur. The Dargall Lane catchment is underlain by a greywacke-shale sequence and by intrusive rocks of granodioritic-tonalitic composition. The shales have a sulphur concentration in the range 0.04-0.19 wt.%, whereas mudstones, greywackes and grandiorites rarely exceed 0.02 wt.% S. Calculations based on bedrock chemical composition, typical denudation rates of sedimentary and intrusive rocks, and the composition of surface water during baseflow, indicate that geogenic sulphur may account for a significant fraction of the sulphate hydrochemical budget. Sulphur mobilised by rock weathering of black shales is likely to be an important contributing factorcausing the observed lack of a significant sulphate decrease in sulfate water despite the reported 30% reduction of sulphate in atmospheric precipitation during the past decade.
- Subjects
ATMOSPHERIC deposition; SULFUR; ACID deposition
- Publication
Water, Air & Soil Pollution, 1999, Vol 110, Issue 3-4, p239
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1023/A:1005011929448