The impact of the supercontinent cycle on ore formation – S06

David Huston (Geoscience Australia)
Bruce Eglington (University of Saskatchewan)
Sally Pehrsson (Natural Resources Canada – Geological Survey of Canada)
It has been well documented for at least 30 years that the abundance certain types of ore deposits has waxed and waned throughout Earth’s history. This periodicity is currently thought to be related to three processes of change: (1) irreversible changes of the Earth’s atmosphere and hydrosphere, (2) irreversible changes to tectonic processes, and (3) episodic changes in geodynamic processes related to the assembly and break-up of supercontinents. The third process, which has been termed the supercontinent cycle, has an important control on the formation and preservation of a range of mineral deposit types, including volcanic-hosted massive sulphide deposits, orogenic gold and pegmatite deposits, amongst others. With recent greatly improved models for supercontinent formation back to the early Paleoproterozoic, the influence of the tectonic style of assembly on deposit abundance is also being recognized. This session investigates the influence of supercontinent cycle and secular changes in tectonic style on not only the secular distribution of deposits, but also their characteristics and how changes in these characteristics may influence exploration.
Types of presentation: Talks (up to 8) and Posters