Application of sequence stratigraphic concepts to Middle Cambrian phosphogenesis, Georgina Basin, Australia

The stratigraphic and spatial distributions of phosphatic and organic-matter rich Middle Cambrian sediments of the Georgina Basin are outlined in terms of sequence stratigraphic concepts. This approach has permitted an integrated analysis of Middle Cambrian depositional patterns and their time constraints. It has also provided insights into aspects of the basins structure, the timing of subsidence of its primary Components, and frequency of relative sea level fluctuations. Middle to early Late Cambrian sediments of the Georgina Basin are interpreted to occur in two stratigraphic sequences. In each sequence phosphorites, phosphatic limestones and organic-matter rich shales comprise a suite of repeating lithofacies restricted to retrogradational parasequence sets of the transgressive systems tract. The position of facies within each transgressive systems tract depends on relative sea level, palaeogeography and palaeotectonics. In sequence 1 (early Middle Cambrian), phosphogenesis is related to gradual transgression of a continent with irregular palaeotopography. Sequence 1a is interpreted to be of local significance, related to early subsidence of the Mt Isa Block during the late Ordian to early Templetonian. A rapid fall in relative sea level terminated sediment accumulation in sequence 1 and led to the development of a subaerial exposure surface. Sediments of the transgressive systems tract in stratigraphic sequence 2 are of lateTempletonian to early Undillan age. Deposition in sequence2 ceased in the Mindyallan. Rocks of the transgressive systemstract occur in three retrogradational parasequence sets. Recognition of sequence boundaries has helped clarify lateralbiofacies, leading to improved reconstructions of thepalaeogeographic distribution of the phosphorites and organic-matter rich shales.

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Date (Publication)
1991-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81286

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Bureau of Mineral Resources, Geology and Geophysics

 Canberra
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Southgate, P.N.

 1
Author

Shergold, J.H.

 2
Name

BMR Journal of Australian Geology and Geophysics

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12:2:119-144

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

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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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  • Journal

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  • Earth Sciences

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  • Published_External

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Creative Commons Attribution 4.0 International Licence

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4.0

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2018-11-01T00:00:00
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English
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Commonwealth of Australia (Geoscience Australia)

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Journal article (pdf)

Journal article (pdf)

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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

Classification
Unclassified

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urn:uuid/fae9173a-70e3-71e4-e044-00144fdd4fa6

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Language
English
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UTF8
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Commonwealth of Australia (Geoscience Australia)

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Name

AGSO BMR Journal

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Geoscience Australia - short identifier for metadata record with

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eCatId/81286

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-70e3-71e4-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:08:09
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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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