Ar-40/Ar-39 age constraints on tectonothermal events in the Shaw area of the eastern Pilbara granite-greenstone terrain (W Australia): 700 Ma of Archean tectonic evolution.

The Shaw area in the eastern Pilbara Craton, consists of granitoids with intrusion ages ranging from 3470 Ma to 2850 Ma, and supracrustal rocks with ages ranging from 3515 Ma to 3100 Ma as determined by U-Pb and Pb-Pb dating methods. In this terrain several major deformation events have recently been recognized, including late strike-slip deformation, compression and early extension. In order to provide time constraints for these events, twenty-four samples from the Shaw area have been used for