Abstract
The lower Proterozoic of the Olary Block is divided into five rock suites defining a conformable stratigraphic sequence correlated with the Willyama Supergroup of the Broken Hill Block, which has a probable depositional age no greater than 1800 Ma. The sequence was deformed and metamorphosed during the ‘Olarian’ Orogeny at ∼ 1580 Ma. Definition of the stratigraphy permits regional structural analysis and the resolution of two folding events: an initial recumbent fold terrain redeformed by upright folds with a near vertical axial surface. The ‘Olarian’ Orogeny comprises a single regional compression axis, with both folding events indicating a SE direction of transport. The described tectonic fabrics are consistent with simple shear deformation generating the early recumbent terrain.
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