A sandstone breccia, formed by quasi-liquid deformation, from the Amadeus Basin, Northern Territory

A prominent sandstone breccia crops out in the Pacoota Sandstone, Western MacDonnell Ranges, Northern Territory. The breccia occurs as discontinuous lenses which grade laterally, through incipient breccia and disrupted sandstone beds, into the enclosing sandstone sequence. This sequence consists of interbedded well-sorted silicia-cemented and poorly sorted friable quartzose sandstones; these two sandstone types also constitute, respectively, the clasts and matrix of the breccia. The clasts are rectangular (joint-bounded) and broken rectangular in shape, ranging up to 1 m in length. The matrix is predominantly massive, but convolute bedding is locally present. Similar sandstone breccias are known from three other localities in the region, all at the same stratigraphic level within the Pacoota Sandstone. Petrographic data indicate that the clast sandstone was cemented and strained prior to brecciation, whilst the matrix sandstone retained a largely cohesionless state and failed in a quasi-liquid manner. It is concluded that the brecciation occurred in situ at a considerable depth in a sedimentary pile, and resulted from the rotation and fragmentation of joint blocks of silica-cemented sandstone in the interbedded mobile matrix sandstone. Pore-water pressures are thought to have played an important role in the mobilization of the matrix sandstone.

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Date (Publication)
1976-01-01T00:00:00
Date (Revision)
2019-04-08T05:52:41
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/80901

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Role Organisation / Individual Name Details
Publisher

Bureau of Mineral Resources, Geology and Geophysics

 Canberra
Author

Kennard, J.M.

 1
Name

BMR Journal of Australian Geology and Geophysics

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1:4:345-349

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Commonwealth of Australia (Geoscience Australia)
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Commonwealth of Australia (Geoscience Australia)

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  • Geoscientific information

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Product data repository: Various Formats

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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

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  • GA Publication

  • Journal

Keywords

  • NT

Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

Keywords

  • Published_External

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Title

Creative Commons Attribution 4.0 International Licence

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CC-BY

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4.0

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http://creativecommons.org/licenses/

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License

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Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
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https://www.protectivesecurity.gov.au/Pages/default.aspx

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Unclassified
Language
English
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UTF8

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Commonwealth of Australia (Geoscience Australia)

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OnLine resource

Journal article (pdf)

Journal article (pdf)

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  • pdf

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Unknown

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Non geographic dataset
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GA Publication

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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-6f62-71e4-e044-00144fdd4fa6

Title

GeoNetwork UUID

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

Commonwealth of Australia (Geoscience Australia)

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Type of resource

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Document
Name

AGSO BMR Journal

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Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/80901

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-6f62-71e4-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:10:22
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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