Citation

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Kennard, J.M., 1976. A sandstone breccia, formed by quasi-liquid deformation, from the Amadeus Basin, Northern Territory. BMR Journal of Australian Geology and Geophysics  1:4:345-349. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

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.
Google map showing geographic bounding box with values North bound -23.5 East bound 133.2 West bound 132.0 South bound -24.5
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Product Type/Sub Type

nonGeographicDataset - GA Publication - Journal

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license
Creative Commons Attribution 4.0 International Licence

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Commonwealth of Australia (Geoscience Australia)

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Date (publication)

1976

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geoscientificInformation

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GA Publication
Journal
Earth Sciences

Resource Language

English

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utf8

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unclassified

Geographic Extent

North bound
-23.5
East bound
133.2
West bound
132.0
South bound
-24.5

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Unknown

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onLine

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pdf

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fae9173a-6f62-71e4-e044-00144fdd4fa6

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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

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unclassified

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Geoscience Australia
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Canberra
Administrative Area
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Postal Code
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Country
Australia
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