Thermal History
- Heat from burial modest.
- Heated to 160+° by intrusion of dolerite sills, dykes and lenses during the early Jurassic, related to break up of Gondwana 180 million years ago. - the Ferrar Dolerite. Reached T of 200-300°C in places.
- Volatiles would have migrated outwards from the hot aureole, condensing when they reached rock cooler than their boiling point. This results in the "steam distillation" of the volatiles.
Read more about this topic: Beacon Sandstone
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