1. Department of Earth Sciences, Durham University, Durham DH1 3LE, UK
2. Geospatial Research Ltd, Durham DH1 4EL, UK
3. Shell Centre for Exploration Geoscience, Institute of GeoEnergy Engineering, Heriot-Watt University, Edinburgh EH14 4AS, UK
4. Centre for Integrated Geological Studies, Babes-Bolyai University, Cluj-Napoca, Romania
5. Department of Geology, Hull University, Hull HU6 7RX, UK
6. British Geological Survey, Edinburgh EH14 4AP, UK
7. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Resources, China University of Geosciences, Wuhan, Hubei Province 430074, China