Neoproterozoic glacial deposits of the Kimberly Region and northwestern Northern Territory, Australia
Corkeron, Maree L. (2011) Neoproterozoic glacial deposits of the Kimberly Region and northwestern Northern Territory, Australia. In Arnaud, E., Halverson, G., & Shields-Zhou, G. (Eds.) Geological Society Memoir 36 The Glacial Record of Neoproterozoic Glaciation. The Geological Society, pp. 659-672.
Neoproterozoic glacigenic formations are preserved in the Kimberley region and northwestern Northern Territory of northern Australia. They are distributed in the west Kimberley adjacent to the northern margins of the King Leopold Orogen, the Mt Ramsay area at the junction of the King Leopold and Halls Creek Orogens, and the east Kimberley, adjacent to the eastern margin of the Halls Creek Orogen. Small outlier glacigenic deposits are preserved in the Litchfield Province, Northern Territory (Uniya Formation) and Georgina Basin, western Queensland (Little Burke Formation).
Glacigenic strata comprise diamictite, conglomerate, sandstone and pebbly mudstone and characterize the Walsh, Landrigan and Fargoo/Moonlight Valley formations. Thin units of laminated dolomite sit conformably at the top of the Walsh, Landrigan and Moonlight Valley formations. Glacigenic units are also interbedded with the carbonate platform deposits of the Egan Formation and Boonall Dolomite. δ13C data are available for all carbonate units. There is no direct chronological constraint on these successions. Dispute over regional correlation of the Neoproterozoic succession has been largely resolved through biostratigraphic, chemostratigraphic and lithostratigraphic analysis. However, palaeomagnetic results from the Walsh Formation are inconsistent with sedimentologically based correlations. Two stratigraphically defined glaciations are preserved in northwestern Australia: the ‘Landrigan Glaciation’, characterized by southwest-directed continental ice-sheet movement and correlated with late Cryogenian glaciation elsewhere in Australia and the world; and, the ‘Egan Glaciation’, a more localized glaciation of the Ediacaran Period. Future research focus should include chronology, palaeomagnetic constraint and tectonostratigraphic controls on deposition.
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|Item Type:||Book Chapter|
|Keywords:||Neoproterozoic, Snowball Earth, Kimberley, glaciation, cap carbonate|
|Subjects:||Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000)|
|Divisions:||Current > Schools > School of Earth, Environmental & Biological Sciences|
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Deposited On:||29 Mar 2012 08:41|
|Last Modified:||29 Mar 2012 08:41|
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