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Geological Society, London, Special Publications; 1997; v. 124; p. 213-228;
DOI: 10.1144/GSL.SP.1997.124.01.13
© 1997 Geological Society of London

Geochemistry

Fluid migration history in the north Irish Sea-North Channel region

John Parnell

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

Basins in the north Irish Sea region have experienced numerous stages of fluid migration. Carboniferous and Permo-Triassic sandstones both experienced rapid cementation due to high sedimentation/burial rates. Both successions also experienced syn-sedimentary faulting which focused cement precipitation and created permeability barriers. Further fracture-based diagenesis occurred post-lithification, and accompanying hydrothermal activity associated with Tertiary intrusions. The extensional activity which helped to define Permo-Triassic basins in the Southern Uplands terrane also channelled mineralizing fluids in the same terrane. These fluids included hydrocarbons in at least two districts. Along the North Solway Fault Zone, basinal fluids from the Carboniferous Solway Basin interacted with metalliferous groundwaters to precipitate metalliferous bitumens. The Solway Carboniferous outcrop also contains intergranular oil residues.





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[Abstract] [PDF]