Citation

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Walter, M.R. & Veevers, J.J., 1997. Australian Neoproterozoic palaeogeography, tectonics, and supercontinental connections. AGSO Journal of Australian Geology and Geophysics  17:1:73-92. Australian Geological Survey Organisation, Canberra.

Abstract

Increasingly precise stratigraphic resolution by biostratigraphy, isotope stratigraphy, and sequence analysis in the Neoproterozoic allows more convincing palaeogeographic reconstructions than hitherto possible, so that the original connections amongst structural basins can be demonstrated. The Neoproterozoic stratigraphy of Australia can now be analysed in terms of four supersequences, with finer subdivision possible in the Ediacarian or Terminal Proterozoic. The palaeogeography of Australia during eight time intervals within the Neoproterozoic is assessed, with varying degrees of confidence. Our interpretation follows previous models of the Adelaide Rift Complex as a Neoproterozoic intracratonic rift between the Gawler and Curnamona cratons. The rift is at a high angle to the associated east-west elongated epicratonic sag of the Centralian Superbasin. In the earliest Cambrian the Flinders zone of the Adelaide Rift Complex was transformed to a failed arm or aulacogen by continental breakup along its southern part. Sedimentation ceased before the Late Cambrian-Early Ordovician (500 Ma) Delamerian Orogeny. The Rift Complex underwent two phases of onlap (= extension) accompanied by the deposition of (Sturtian and Marinoan) glacials. A third phase of onlap represented by the Billy Springs Formation occurred during right-lateral shearing (Petermann Ranges orogeny) that caused thrusting and the emergence of the east-west oriented Musgrave Block in the middle of the Superbasin. The Superbasin was finally dismembered by the rise of the southern Arunta Block between the Amadeus and Ngalia structural basins during the mid-Carboniferous Alice Springs Orogeny. According to the SWEAT hypothesis, Australia was joined in the Neoproterozoic with India, Antarctica, and Laurentia, so that the Tasman Line faced the Canadian-Wyoming cordilleran line. The configuration of the north-south trending Adelaide Rift Complex and the east-west trending Centralian Superbasin was mirrored by the basins in Laurentia to form a T, which split at the end of the Neoproterozoic by growth of a precursor of the Pacific Ocean.
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nonGeographicDataset - GA Publication - Journal

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Creative Commons Attribution 4.0 International Licence

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Commonwealth of Australia (Geoscience Australia)

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Date (publication)

1997

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nonGeographicDataset

Topic Category

geoscientificInformation

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GA Publication
Journal
Earth Sciences

Resource Language

English

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utf8

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unclassified

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Unknown

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onLine

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pdf

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Australia
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Metadata File Identifier

fae9173a-71a5-71e4-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

2015-03-23

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

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pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
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Downloads
For information on acquiring this product,
please contact Geoscience Australia Client Services via:

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1800 800 173 (within Australia);
 
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