Events
The most illustrating way of considering the Musgrave Block is as part of a time-space plot in which geological events are arrayed in time against rock units, stratigraphic relationships and for correlative purposes.
The key events in the Musgrave Block are;
- Protolith formation ~1550 Ma. Formation of crustal rocks of the Birksgate Complex, which are both mafic and felsic in composition.
- Igneous event and orogeny ~1300 Ma inferred from geochronology and distribution of felsic “volcanic” supracrustal sequence of the high grade gneisses
- Musgravian orogeny at ~1200 Ma including generation of voluminous Kulgera Suite of granites and metamorphosis of the Birksgate Complex and ~1300 supracrustal sequence to amphibolite-granulite facies
- Warakurna Large igneous province at 1076 ± 6 Ma including the intrusion of the Giles Complex and the Winburn Suite of granites, plus deposition of the Bentley Supergroup (including Tollu and Smoke Hill Volcanics)
- Amata Dyke Suite at ~830-880 Ma
- Petermann Orogeny, 535-550 Ma; marginal foreland basin formation, trending to crustal consolidation and quiescence
- Permian glaciation and erosion of Petermann Orogeny mountains; deposition of Permian sequences in Officer and Amadeus basins
- Intracontinental setting till present
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