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Geological Society, London, Special Publications; 1996; v. 107; p. 51-63;
DOI: 10.1144/GSL.SP.1996.107.01.05
© 1996 Geological Society of London

Mineralization, Hydrocarbons and Diagenesis

Metal-organic interactions in the Dinantian Solway Basin, UK: inferences for oil migration studies

C. Veale & J. Parnell

School of Geosciences, The Queen’s University, Belfast BT7 1NN, UK

Carboniferous basins within the British Isles show a variety of metal-organic fluid interactions, including the precipitation of thoriferous bitumen nodules. These represent the interaction between a thorium-rich fluid, such as groundwater, and migrating hydrocarbons. They are found in the Dinantian of the Northwest Irish Basin and the Solway Basin. In the latter case, nodules are found in coarse-grained clastics laid down in a variety of depositional environments. The source of the thorium was the nearby Caledonian Criffel-Dalbeattie Granite. Studies of sedimentological parameters of both nodule-bearing and barren beds, and the structure of the basin, show that factors controlling the distribution of nodules include the maturity and porosity of the host rock, with an enhanced maturity and high porosity preferable, as well as the depositional environment. In the case of the Dinantian of the Solway Basin, distal shallow-marine sediments and channelized deposits host the nodules. Chemical age dating of the thoriferous inclusions within the nodules points to the possible use of these nodules in assessing the timing as well as spatial distribution of hydrocarbon migration within sedimentary basins. Results indicate a correlation with previous models of Mesozoic hydrocarbon migration.





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J. Parnell
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Geological Society, London, Special Publications, 1997; 124: 213 - 228.
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