Silcretes of the Mirackina Palaeochannel, Arckaringa, South Australia

The Mirackina Palaeochannel (MPC) consists of a chain of parallel silcrete-capped mesas extending for about 200 km through the far north of South Australia. The channel fill comprises fluvial conglomerate and sandstone; has a siliceous and ferruginous duricrust caprock; and overlies kaolinised and weakly silicified Bulldog Shale. The MPC presents a striking example of inverted topography and exhumed palaeodrainage on airphotos and Landsat imagery. However, a study of a section of the MPC 60 km long west and northwest of Arckaringa homestead, about 150 km north of Coober Pedy, has shown that most of its non-indurated fill has been removed by erosion. Fill remnants are preserved beneath parallel lines of silcrete cappings created by groundwatcr discharge along the channel margins. These caprocks have been extensively tilted and displaced by landslides within the underlying Bulldog Shale. The ferruginous silcrete capping of the MPC is typically about 30 m lower than the adjacent Stuart Range and Arckaringa Hills land surfaces, which are probably equivalent to the Cordillo Surface of early Tertiary age. The palaeochannel sediments are thought to be Miocene, though their silicification may have been completed later (possibly during the Pliocene) and over a short interva l.

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Date (Publication)
1996-01-01T00:00:00
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Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81441

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Australian Geological Survey Organisation

 Canberra
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McNally, G.H.

 1
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Wilson, I.R.

 2
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AGSO Journal of Australian Geology and Geophysics

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16:3:295-301

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Commonwealth of Australia (Geoscience Australia)
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2018-11-01T00:00:00
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English
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Australian Government Security ClassificationSystem

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2018-11-01T00:00:00
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urn:uuid/fae9173a-717e-71e4-e044-00144fdd4fa6

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English
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Commonwealth of Australia (Geoscience Australia)

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AGSO BMR Journal

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eCatId/81441

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2018-04-20T06:07:22
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2014-06-03T00:00:00

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ISO 19115-1:2014

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ISO 19115-3

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

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Version 2.0, September 2018

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

 
 

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