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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Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1997-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

81480 Product http://www.ga.gov.au/metadata-gateway/metadata/record/81480/

Keywords

GA Publication
Journal
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Lineage

Unknown

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Source Description

Source data not available.

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 SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
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