The geochemistry of oil in Cornish granites

Mas'Ud Baba (Corresponding Author), John Parnell, Stephen Bowden

Research output: Contribution to journalArticle

Abstract

Oil residues in Variscan granites in Cornwall, SW England, preserve biomarker data which indicate an origin from marine source rocks. The biomarkers also indicate a thermal maturity that excludes an origin from the Devono-Carboniferous rocks intruded by the granites, but is similar to that of Jurassic-sourced oil to the east in the Wessex Basin. A suite of 5 different samples from the South Crofty tin mine are variably biodegraded, implying alteration after emplacement of oil in the granite. These characteristics are compatible with models for up-dip flow of fluids from offshore Mesozoic sediments into older granite topographic highs.
Original languageEnglish
Pages (from-to)298-305
Number of pages8
JournalPetroleum Geoscience
Volume25
Issue number3
Early online date9 Nov 2018
DOIs
Publication statusPublished - 19 Dec 2018

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Geochemistry
Oils
geochemistry
Granite
Biomarkers
biomarker
oil
Tin mines
granite
Rocks
thermal maturity
tin
Hercynian orogeny
source rock
Flow of fluids
dip
Sediments
emplacement
Jurassic
fluid

Cite this

The geochemistry of oil in Cornish granites. / Baba, Mas'Ud (Corresponding Author); Parnell, John; Bowden, Stephen.

In: Petroleum Geoscience, Vol. 25, No. 3, 19.12.2018, p. 298-305.

Research output: Contribution to journalArticle

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