Emplacement of oil in the Weardale Granite

M Baba (Corresponding Author), J. Parnell, S. Bowden, J. Armstrong, M. Perez, X. Wang

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Abstract

Oil residues occur as solid bitumen in mineralized zones within the Devonian Weardale Granite of the northern Pennines, Northern England. Comparable residues are present in the overlying Mississippian rocks and were probably derived from a Carboniferous source, i.e. during later mineralization of the granite. The bitumen was already solidified during fluorite mineralization, which does not contain oil inclusions. The residues do not show the high thermal maturity of organic matter in the region altered by the earliest Permian Whin Sill. Like the sulphide-fluorite mineralization, oil emplacement post-dated intrusion of the sill. Pyrite associated with the oil residues is enriched in trace elements including lead, silver, gold, selenium and tellurium, which suggests that mineralizing fluids at least shared pathways with migrating hydrocarbons and possibly also suggests undiscovered valuable metal resources.
Original languageEnglish
JournalProceedings Of The Yorkshire Geological Society
Early online date7 Dec 2018
DOIs
Publication statusE-pub ahead of print - 7 Dec 2018

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emplacement
granite
oil
fluorite
bitumen
mineralization
sill
tellurium
thermal maturity
selenium
silver
pyrite
Permian
gold
sulfide
trace element
hydrocarbon
organic matter
fluid
metal

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Emplacement of oil in the Weardale Granite. / Baba, M (Corresponding Author); Parnell, J.; Bowden, S.; Armstrong, J.; Perez, M.; Wang, X.

In: Proceedings Of The Yorkshire Geological Society, 07.12.2018.

Research output: Contribution to journalArticle

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abstract = "Oil residues occur as solid bitumen in mineralized zones within the Devonian Weardale Granite of the northern Pennines, Northern England. Comparable residues are present in the overlying Mississippian rocks and were probably derived from a Carboniferous source, i.e. during later mineralization of the granite. The bitumen was already solidified during fluorite mineralization, which does not contain oil inclusions. The residues do not show the high thermal maturity of organic matter in the region altered by the earliest Permian Whin Sill. Like the sulphide-fluorite mineralization, oil emplacement post-dated intrusion of the sill. Pyrite associated with the oil residues is enriched in trace elements including lead, silver, gold, selenium and tellurium, which suggests that mineralizing fluids at least shared pathways with migrating hydrocarbons and possibly also suggests undiscovered valuable metal resources.",
author = "M Baba and J. Parnell and S. Bowden and J. Armstrong and M. Perez and X. Wang",
note = "The research was partly supported by NERC grant NE/M010953/1. MB is in receipt of a PhD studentship from PTDF (Nigeria). K.C. Dunham kindly provided samples from the Rookhope Borehole. P. Eakin collected bitumen at Moot Law. We are most grateful to very careful reviews by F. Smith and D. Holliday, which greatly improved presentation of the work.",
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AU - Armstrong, J.

AU - Perez, M.

AU - Wang, X.

N1 - The research was partly supported by NERC grant NE/M010953/1. MB is in receipt of a PhD studentship from PTDF (Nigeria). K.C. Dunham kindly provided samples from the Rookhope Borehole. P. Eakin collected bitumen at Moot Law. We are most grateful to very careful reviews by F. Smith and D. Holliday, which greatly improved presentation of the work.

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AB - Oil residues occur as solid bitumen in mineralized zones within the Devonian Weardale Granite of the northern Pennines, Northern England. Comparable residues are present in the overlying Mississippian rocks and were probably derived from a Carboniferous source, i.e. during later mineralization of the granite. The bitumen was already solidified during fluorite mineralization, which does not contain oil inclusions. The residues do not show the high thermal maturity of organic matter in the region altered by the earliest Permian Whin Sill. Like the sulphide-fluorite mineralization, oil emplacement post-dated intrusion of the sill. Pyrite associated with the oil residues is enriched in trace elements including lead, silver, gold, selenium and tellurium, which suggests that mineralizing fluids at least shared pathways with migrating hydrocarbons and possibly also suggests undiscovered valuable metal resources.

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