Cold Climate in the Eastern Australian Mid to Lade Permian may Reflect Cold Upwelling Waters

A suite of ice-rafted dropstones and glendonites throughout the Permian succession of eastern Australia has led many researchers to suggest that the late Paleozoic glaciation terminated diachronously in this part of Gondwana. Paradoxically, these cold climate indicators are preserved in transgressive and highstand facies and formed at mid to high latitudes at a time when paleofloral data suggest temperate conditions at the pole. These apparent inconsistencies suggest that rather than recording the development of glacial conditions in eastern Gondwana, these features indicate localized cooling. A lack of glacial facies in the sedimentary basins and equable onshore climates indicated by abundant coal measures suggest that cooling of this part of the Gondwanan coast must have been driven by offshore processes. Upwelling of cold abyssal waters is one process by which this may have occurred. Coupled atmosphere-ocean models for the Permian indicate that onshore breezes and Ekman (geostrophic) currents may have resulted in upwelling along this section of the Gondwanan coast. This hypothesis is supported by the high productivity Eurydesma fauna that characterizes the strata, the relatively high total organic carbon content of the offshore mudrocks, and elevated phosphate concentrations within some horizons, which together display a similarity with modern upwelling zones. For the first time, this new hypothesis reconciles the prolonged deposition of cold-climate indicators in the eastern Australian Permian with a synchronous collapse of the late Paleozoic glaciation in the mid-Sakmarian.

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Date (Publication)
2005-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/61626

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Digital Object Identifier/http://dx.doi.org/10.1016/j.palaeo.2005.12.009

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Jones, A.T.

 1
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Fielding, C.R.

 2
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Frank, T.D.

 3
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Commonwealth of Australia (Geoscience Australia)
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Commonwealth of Australia (Geoscience Australia)

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Product data repository: Various Formats

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  • Earth Sciences

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2018-11-01T00:00:00
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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/a05f7892-c332-7506-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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Non geographic dataset
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nonGeographicDataset

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Geoscience Australia - short identifier for metadata record with

uuid

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eCatId/61626

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/a05f7892-c332-7506-e044-00144fdd4fa6

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2018-04-20T06:02:43
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2004-09-20T00:00:00

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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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