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Magnetostratigraphic tests of lithostratigraphic correlations between latest Proterozoic sequences in the Ngalia, Georgina and Amadeus Basins, central Australia

Palaeomagnetic polarity sequences have been determined for the lower Yuendumu Sandstone of the Ngalia Basin, and the upper Wonnadinna Dolomite and lower Gnallan-a-gea Arkose of the Georgina Basin to illustrate an application of magnetostratigraphy, i.e. to test previous correlations. The Yuendumu Sandstone of the Ngalia Basin had been correlated with the Arumbera Sandstone because of lithological similarities, as well as palaeogeographic and tectonic considerations. The discovery of trace fossils in the upper Yuendumu Sandstone had supported a correlation with the upper, Cambrian, part of the Arumbera Sandstone. The age of the lower Yuendumu Sandstone was unknown. It was found to be of mixed polarity with a marked normal bias. Magnetostratigraphic comparisons with the polarity pattern from the Amadeus Basin are equivocal: they allow correlations with both the upper part of Arumbera Sandstone I (latest Proterozoic), and the Arumbera Sandstone II-III (Early Cambrian). Since Arumbera II lies unconformably on Arumbera I, we searched for a break within the Yuendumu Sandstone. Photointerpretation and field observation revealed an unconformity within the formation, which, together with the palaeomagnetic data, indicates that the lower part of the sandstone is best correlated with the upper part of Arumbera Sandstone I, and thus is of latest Proterozoic age. The polarity pattern from the Georgina Basin stimulated a reassessment of possible correlations and the collection of new field data. The magnetostratigraphic test was to check whether the reversely magnetised Julie Formation of the Amadeus Basin correlated with the Wonnadinna Dolomite of the Georgina Basin. The magnetostratigraphic result was negative; the Wonnadinna Dolomite is predominantly normally magnetised. This led to an examination of drill cores from near Mount Skinner on the Alcoota 1:250 000 Sheet area, which showed that the Grant Bluff Formation, which elsewhere overlies the Gnallan-a-gea Arkose and the Wonnadinna Dolomite, occurs at depth below correlatives of Arumbera I, the Julie Formation and the upper Pertatataka Formation. It now appears that the Grant Bluff Formation and the Gnallan-a-gea Arkose (Georgina Basin) are correlatives of the Cyclops and Waldo Pedlar Members of the Pertatataka Formation (Amadeus Basin). The Wonnadinna Dolomite is thought to be a correlative of the cap dolomites above the upper tillites of the Ngalia and Amadeus Basins. The new Adelaidean stratigraphy of the central Australian basins has immediate application with regard to Adelaidean Polarity Time Scales; it allows for partial coverage back to the time of the upper glaciation of the late Proterozoic.

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Identification info

Date (Publication)
1979-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/80984

Cited responsible party
Role Organisation / Individual Name Details
Publisher

Bureau of Mineral Resources, Geology and Geophysics

Canberra
Author

Burek, P.J.

1
Author

Walter, M.R.

2
Author

Wells, A.T.

3
Name

BMR Journal of Australian Geology and Geophysics

Issue identification

4:1:47-55

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Role Organisation / Individual Name Details
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Corp

Owner

Commonwealth of Australia (Geoscience Australia)

Custodian

Commonwealth of Australia (Geoscience Australia)

Voice
Topic category
  • Geoscientific information

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E
W


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Unknown

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Title

Product data repository: Various Formats

Website

Data Store directory containing the digital product files

Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes

Keywords
  • GA Publication

  • Journal

Keywords
  • NT

  • QLD

  • WA

Australian and New Zealand Standard Research Classification (ANZSRC)
  • Earth Sciences

Keywords
  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License

Resource constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Commonwealth of Australia (Geoscience Australia)

Voice
OnLine resource

Journal article (pdf)

Journal article (pdf)

Distribution format
  • pdf

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Unknown

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Non geographic dataset
Other

GA Publication

Description

Source data not available.

Metadata constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/fae9173a-6fb5-71e4-e044-00144fdd4fa6

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

Voice

Type of resource

Resource scope
Document
Name

AGSO BMR Journal

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/80984

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-6fb5-71e4-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:08:37
Date info (Creation)
2014-06-03T00:00:00

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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N
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W



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