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 language | English |
|---|---|
| Pages (from-to) | 298-305 |
| Number of pages | 8 |
| Journal | Petroleum Geoscience |
| Volume | 25 |
| Issue number | 3 |
| Early online date | 9 Nov 2018 |
| DOIs | |
| Publication status | Published - 19 Dec 2018 |
Access to Document
- Baba_et_al_PG_Geoscience_Cornish_Granites_VOR
© 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)