Petermann Orogeny - Dynamics

Dynamics

The Petermann Orogeny is dominated by south-over-north movement on several large, anastomosing arcuate thrust faults. The prime thrust fault is the Woodroffe Thrust, which is a laminated pseudotachlyte-schist zone up to 300 metres thick. This has accommodated up to 42 kilometres of vertical movement at an angle of about 15 to 20 degrees.

The structure of the Petermann Orogen within the Musgrave Block is considered to be a flower-structure, which is a set of vertically arcuate thrust faults which dip toward each other and accommodate vertical movement by essentially squeezing the central block up and out.

Several northeast trending discontinuities including the Mundrabilla lineament divide the Petermann orogeny, with extensive vertical offsets across them, usually west-side-up, though the timing of this event is unknown.

Read more about this topic:  Petermann Orogeny

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