The Cretaceous of the Eromanga and Surat Basins

Little deformed Cretaceous sedimentary rocks underlie 1 500 000 km^2 of eastern Australia. Depositional environments in them range from freshwater to shallow marine. The Neocomian and Aptian sequences are quartz-rich, and the Albian and Cenomanian sequences are quartz-poor. The older sequences were derived largely from nearby basement rises, while the younger sequences were probably derived from Cretaceous volcanics forming a mountain range to the northeast. Glauconie is common in marine and paralic sequences. An epicontinental sea, with seaways to the north and east, covered the basins in the late Aptian, but the eastern seaway closed during an early Albian regression. A second transgressive-regressive cycle, in the late Albian, was virtually confined to the Eromanga Basin. Collectively the two transgressions and regressions were spread over about 20 million years. The present Baltic Sea is thought to provide a small-scale depositional model for the sequences under consideration: of an epicontinental sea in a cool climate, in which the salinity, the number of planktonic organisms, and the variety of benthonic organisms, decrease away from the ocean. The shallowness of the sea and its entrances mean that it is very susceptible to major environmental changes, caused by such factors as eustatic changes of sea level. The area had a gentle northwesterly regional tilt during the Cretaceous, but mid-Tertiary movements changed this to southwesterly. Despite subsequent erosion, as much as 2000 m of Cretaceous sediment is preserved in the Eromanga Basin, and 700 min the Surat Basin.

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Date (Publication)
1976-01-01T00:00:00
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Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/80863

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Bureau of Mineral Resources, Geology and Geophysics

 Canberra
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Exon, N.F.

 1
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Senior, B.R.

 2
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BMR Journal of Australian Geology and Geophysics

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1:1:33-50

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

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Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

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2018-11-01T00:00:00
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English
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Journal article (pdf)

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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

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urn:uuid/fae9173a-6f3c-71e4-e044-00144fdd4fa6

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English
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UTF8
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Commonwealth of Australia (Geoscience Australia)

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AGSO BMR Journal

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Geoscience Australia - short identifier for metadata record with

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eCatId/80863

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-6f3c-71e4-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:08:45
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2014-06-03T00:00:00

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AU/NZS ISO 19115-1:2014

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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

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

 
 

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