Abstract
The occurrence of hydrocarbons (bitumens senso lato) in granite plutons and other basement rocks is not per se evidence of an abiogenic origin for the hydrocarbons. On the contrary, plutons are thermal foci and often highly fractured, and therefore are hosts to the migration of fluids from outside the plutons, including water and biogenic hydrocarbons. Hydrocarbons are associated with several British granites. In all cases they can be attributed to biogenic sedimentary source rocks. The occurrences are particularly related to hydrothermal mineralized veins in granites, including the Cornish Hercynian granites, the Mountsorrel Granodiorite and the Weardale Granite.
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