Pilbara craton

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Description:
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 Vaalbara supercontinent, and then believed to have belonged to Ur continent.

The Pilbara Craton comprises a mid-Archaean granite-greenstone terrane and an overlying late-Archaean volcano-sedimentary sequence called the Hamersley Basin. The Tabba Tabba Shear Zone is the major division between the East and West Pilbara craton. The Tabba Tabba Shear Zone is a granodioritic suite that forms the eastern boundary fault of the Mallina Basin.

Chronology

Ca. 3.6 Ga First Major Tectonic Cycle

The Pilbara craton evolved over two approximately 360 Ma tectonic cycles. Zircon geochronology indicates that the bulk of the intermediate to silicic igneous 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...
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