Change from plume to convergent tectonics in the early Archaean: metallogenic implications in the Pilbara Craton, Western Australia

AUTHORS: Huston, D.L., Van Kranendonk, M.J., Hickman, A.H., Pirajno, F.

ABSTRACT: At ~3.2 Ga the driver of crustal growth in the 3.7- .83 Ga Pilbara Craton changed from mantle plume to plate tectonic processes. Although volcanic-hosted massive sulfide and lodegold deposits spanned this change, factors such as the development of arc-related volcanic basins and transpressional orogenic belts favor development of larger deposits after the initiation of plate tectonics. Development of passive margins after 3.2 Ga allowed deposition of Hamersley-type banded iron formations, the source of most of the world’s iron. Porphyry Cu- Mo and epithermal deposits are present in rocks older than 3.2 Ga, suggesting that these deposits spanned most of geologic time and that porphyry Cu-Mo deposits form in settings other than convergent margins.

KEYWORDS: Pilbara Craton, metallogeny, mantle plumes, convergent tectonics, Archaean

EAN: SGA_2007_A006
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