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Geochemistry and origin of organic-rich sediment veins in fractured granitic basement, Helmsdale, Sutherlandshire, UK

Geochemistry and origin of organic-rich sediment veins in fractured granitic basement, Helmsdale, Sutherlandshire, UK
Geochemistry and origin of organic-rich sediment veins in fractured granitic basement, Helmsdale, Sutherlandshire, UK
Black sediment veins up to 2 cm width penetrate the Caledonian Helmsdale Granite in the vicinity of the Helmsdale Fault, onshore Moray Firth. The black colour and geochemistry of the veins reflect a high content of organic carbon. Both Devonian and Jurassic shales are conceivable available sources, but sterane compositions relate the organic matter to the Jurassic shales. A content of extractable organic matter higher than in the shales suggests that the carbon in the veins represents oil rather than mechanically mobilized shale. The oil was present during sediment vein emplacement. The veins were emplaced forcefully, which may reflect high fluid pressure associated with post-Jurassic movement on the Helmsdale Fault.
0264-8172
107-114
Parnell, John
b86302b0-b930-4b7c-9786-13abc612fef7
Baba, Mas'ud
67190faf-ba8c-473d-9b02-41a9c22d417c
Bowden, Stephen
268b55da-fa8c-4b77-971d-bf33fd8547b6
Bullock, Liam
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d
Parnell, John
b86302b0-b930-4b7c-9786-13abc612fef7
Baba, Mas'ud
67190faf-ba8c-473d-9b02-41a9c22d417c
Bowden, Stephen
268b55da-fa8c-4b77-971d-bf33fd8547b6
Bullock, Liam
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d

Parnell, John, Baba, Mas'ud, Bowden, Stephen and Bullock, Liam (2017) Geochemistry and origin of organic-rich sediment veins in fractured granitic basement, Helmsdale, Sutherlandshire, UK. Marine and Petroleum Geology, 88, 107-114. (doi:10.1016/j.marpetgeo.2017.08.013).

Record type: Article

Abstract

Black sediment veins up to 2 cm width penetrate the Caledonian Helmsdale Granite in the vicinity of the Helmsdale Fault, onshore Moray Firth. The black colour and geochemistry of the veins reflect a high content of organic carbon. Both Devonian and Jurassic shales are conceivable available sources, but sterane compositions relate the organic matter to the Jurassic shales. A content of extractable organic matter higher than in the shales suggests that the carbon in the veins represents oil rather than mechanically mobilized shale. The oil was present during sediment vein emplacement. The veins were emplaced forcefully, which may reflect high fluid pressure associated with post-Jurassic movement on the Helmsdale Fault.

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Accepted/In Press date: 9 August 2017
Published date: 12 August 2017

Identifiers

Local EPrints ID: 421785
URI: http://eprints.soton.ac.uk/id/eprint/421785
ISSN: 0264-8172
PURE UUID: 2f23807a-5d0c-49fc-997a-883e4cdf42d9

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Date deposited: 27 Jun 2018 16:30
Last modified: 27 Apr 2022 10:06

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Contributors

Author: John Parnell
Author: Mas'ud Baba
Author: Stephen Bowden
Author: Liam Bullock

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