The Pilbara craton (the Pilbara province in northwest Western Australia), along with the Kaapvaal craton (the Kaapvaal province of South Africa) are the only remaining areas of pristine Archaean 3.6-2.7 Ga crust on Earth. Similarities of their rock records, especially the similarities in the overlying Late Archean sequences of both these cratons, suggest that they were once part of the Vaalbarasupercontinent, and then believed to have belonged to Ur continent.
The Pilbara craton evolved over two approximately 360 Matectonic cycles. Zircongeochronology indicates that the bulk of the intermediate to silicicigneous rocks in the Pilbara formed during seven periods of paired volcanic and plutonic activity. The extent of pre-3.5 Ga rocks is uncertain, but appears limited to... Read More