Tectonic controls on sediment provenance evolution in rift basins: Detrital zircon U–Pb and Hf isotope analysis from the Perth Basin, Western Australia
Embargo Lift Date
MetadataShow full item record
The role of tectonics in controlling temporal and spatial variations in sediment provenance during the evolution of extensional basins from initial rifting to continental breakup and passive margin development are not well established. We test the influence of tectonics in a rift basin that has experienced minimal uplift but significant extension throughout its history: the Perth Basin, Western Australia. We use published zircon U–Pb and Hf isotope data from basin inception through to continental drift and complement this with new data from samples deposited synchronously with the continental breakup of eastern Gondwana. Three primary source regions are inferred, namely the Archean Yilgarn Craton to the east, the Paleo- and Mesoproterozoic Albany–Fraser–Wilkes Orogen to the south and east, and the Mesoproterozoic and Ediacaran–Cambrian Pinjarra Orogen underlying the rift basin and comprising the dominant crustal components to the west and southwest. From mid-Paleozoic basin inception to Early Cretaceous breakup of eastern Gondwana, drainage in the Perth Basin was primarily north- to northwest-directed as evidenced by the dominant Mesoproterozoic detrital zircon cargo, paleodrainage patterns and paleocurrent directions. Thus, provenance was primarily parallel to the rift axis and perpendicular to the extension direction, particularly during periods of thermal subsidence. During episodes of mechanical extension, detrital zircon ages are polymodal and consistently dominated by Paleo- and Mesoproterozoic grains derived from the Albany–Fraser–Wilkes Orogen, but with significant Archean and Neoproterozoic inputs from the rift margins. It is inferred that during mechanical extension the rate of subsidence exceeded sediment supply, which generated basin-margin scarps and enhanced direct input from the rift shoulders. Detrital zircon spectra from temporally-equivalent samples at the rift margin and in the rift axis reveal that distinct sedimentary routing operated on the flanks. In summary, sediment provenance in the Perth Basin (and probably other rift basins) is tectonically controlled by: (1) extension direction, (2) episodes of mechanical extension (rift) or thermal subsidence (post-rift), and (3) proximity to rift axis or rift margin.
Showing items related by title, author, creator and subject.
Tectonic links between Proterozoic sedimentary cycles, basin formation and magmatism in the Albany–Fraser Orogen, Western AustraliaSpaggiari, C.V.; Kirkland, Chris; Smithies, R.; Wingate, M. (2014)Preserved in the Albany–Fraser Orogen are the remnants of two, regionally extensive basin systems — the c. 1815 to 1600 Ma Barren Basin and the c. 1600 to 1305 Ma Arid Basin. An extensive U–Pb zircon geochronology dataset ...
Visualizing the sedimentary response through the orogenic cycle: a multi-dimensional scaling approachSpencer, Christopher; Kirkland, C. (2016)Changing patterns in detrital provenance through time have the ability to resolve salient features of an orogenic cycle. Such changes in the age spectrum of detrital minerals may be attributable to fluctuations in the ...
Tracking sediment dispersal during orogenesis: A zircon age and Hf isotope study from the western Amadeus Basin, AustraliaHaines, P.; Kirkland, Chris; Wingate, M.; Allen, H.; Belousova, E.; Gréau, Y. (2015)© 2015. The c. 570-530. Ma intraplate Petermann Orogeny of central Australia involved high temperature and pressure metamorphism, deformation, and uplift of the Mesoproterozoic Musgrave region and associated components ...