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| Dundas Tectonic Zone | |
|---|---|
| Name | Dundas Tectonic Zone |
| Type | Tectonic zone |
| Region | Western Australia |
| Age | Proterozoic |
Dundas Tectonic Zone is a Proterozoic-scale structural corridor in Western Australia associated with major crustal deformation, metamorphism, and mineralization. It juxtaposes Archean and Proterozoic terranes and is recorded in regional mapping by agencies such as the Geological Survey of Western Australia and academic studies from institutions like the University of Western Australia and the Commonwealth Scientific and Industrial Research Organisation. The zone is a focus for exploration by major mining companies including BHP, Rio Tinto, and Newmont Goldcorp.
The Dundas Tectonic Zone traverses lithotectonic domains mapped adjacent to the Yilgarn Craton, Gascoyne Complex, and Proterozoic basins influenced by the Pilbara Craton and Hamersley Basin, exhibiting strike-slip, thrust, and transpressional fabrics recorded in airborne magnetics and regional gravity surveys by the Geoscience Australia program. Outcrop and drillcore reveal metavolcanic, metasedimentary, and granitoid assemblages analogous to units described in the literature for the Jack Hills, Kalgoorlie Terrane, and Narryer Gneiss Complex, with shear zone architectures comparable to the Murchison Province and Pilbara Fold Belt. Structural mapping by teams from the Curtin University and the Australian National University documents mesoscale folds, S-C fabrics, and mylonitic foliation contiguous with crosscutting dolerite dykes similar to those observed near Meekatharra and Leonora.
Models for the Dundas Tectonic Zone invoke Proterozoic orogenic cycles contemporaneous with regional events such as the Kimberley Orogeny and the younger modifications linked to the Gondwana assembly and breakup. Tectonometamorphic episodes correlate with regional metamorphism recorded in studies referencing the Australian Shield framework and global comparisons to fez-scale belts like the Trans-Hudson Orogen and Grenville orogeny where similar collisional processes produced high-strain corridors. Paleoproterozoic to Mesoproterozoic deformation phases are constrained by stratigraphic relationships with units analogous to the Hamersley Formation and syntectonic granitoids comparable to those sampled near Kalgoorlie and Karratha, and reflect crustal reworking linked to plate interactions involving the Pacific Plate and fragments of the India plate during supercontinent cycles.
The Dundas Tectonic Zone hosts polymetallic mineralization styles including mesothermal gold, volcanogenic massive sulfide (VMS) analogs, and orogenic base-metal systems reminiscent of deposits described at Kalgoorlie Super Pit, Telfer Mine, and the Super Pit. Exploration along the zone has targeted shear-hosted gold similar to orebodies at St Ives Gold Mine and sulphide-rich horizons comparable to Murrin Murrin and Eneabba mineral provinces. Joint ventures and listed explorers such as Evolution Mining, Northern Star Resources, and junior groups active on the Australian Securities Exchange have reported anomalous geochemical signatures for gold, nickel, copper, and rare earth elements parallel to economic models used by Bureau of Mineral Resources planners and consultants from firms like SRK Consulting.
High-precision geochronology employing U–Pb zircon and monazite dating executed at laboratories affiliated with the Australian National University and international centers has provided age constraints that tie the Dundas corridor to Mesoproterozoic magmatism and metasomatism comparable to ages reported for the Albany–Fraser Orogen and the Musgrave Province. Geophysical imaging using magnetotellurics, seismic reflection, and potential-field inversion performed in collaboration with Geoscience Australia and industry partners reveals crustal-scale discontinuities similar to those interpreted beneath the Canning Basin and the Officer Basin, with magnetic lineaments matching trends documented in the Tectonic Map of Australia. Isotopic studies (Sr–Nd–Pb) undertaken by research groups at Macquarie University and the University of Adelaide indicate crustal assimilation processes akin to models used for the Gawler Craton and Yilgarn Craton.
Regionally, the Dundas Tectonic Zone is a key element in reconstructions of Western Australian Proterozoic architecture and is used in comparative studies alongside the Musgrave Block, Tennant Creek Mineral Field, and the Curnamona Province. Correlations with crustal corridors in the Laurentia and Rodinia reconstructions provide context for supercontinent assembly research pursued by collaborations involving institutions like the EarthByte Group and the International Continental Scientific Drilling Program. The zone's structural corridors influence modern crustal stress fields monitored by the Geoscience Australia seismic network and inform regional resource policy discussions involving the Western Australian Department of Mines, Industry Regulation and Safety and national programs such as the Australian Research Council funded projects.
Category:Tectonics of Western Australia