Authors / CoAuthors
Maidment, D.W. | Hand, M. | Williams, I.S.
Abstract
Detrital zircon geochronology of high-grade metasedimentary rocks of the Harts Range Group (HRG) in central Australia indicates that its protoliths were deposited during the Neoproterozoic and Cambrian, coeval with sedimentation in the adjacent Amadeus and Georgina basins of the former Centralian Superbasin. The similar provenances of the HRG and basin successions imply that the HRG is the high-grade metamorphic correlative of the basin sequences. Metamorphic zircon formation at ~477 Ma and ~459 Ma appears to reflect peak and retrograde phases of the Early Ordovician Larapinta Event. Palaeogeographic reconstructions indicate that burial and metamorphism took place beneath an epicratonic sea, associated with the formation of a flat-lying foliation in the lower crust and tholeiitic magmatism, consistent with an extensional setting. Burial of the HRG to ~30 km appears to have taken place predominantly by sedimentary loading within an exceptionally deep intracratonic rift basin, the depth of which rivals those of the deepest basins in Earth history. This indicates that lower crustal high-grade metamorphism need not reflect compressional thickening of the crust.
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nonGeographicDataset
eCat Id
65049
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
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2601
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Keywords
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- External PublicationScientific Journal Paper
- ( Theme )
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- geochronology
- ( Theme )
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- metamorphism
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- AU-NT
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2006-12-18T00:00:00
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geoscientificInformation
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[-23.5, -22.5, 134.5, 136.5]
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