The Brunhes/Matuyama Polarity Transition (0.78 Ma) as a chronostratigraphic marker in Australian regolith studies

The Brunhes/Matuyama (B/M) polarity transition (0.78 Ma) marks the end of the last major period of reversed polarity of the Earth s magnetic field. Weathered regolith materials with reversed polarity chemical remanent magnetisation (CRM) must, therefore, predate the B/M transition. Reversed polarity magnetisation can be preserved in a wide variety of regolith materials in eastern Australia, particularly in oxidising environments. At Sellicks Beach and Hallett Cove near Adelaide, the B/M transition is identified in a strongly mottled unit, the Ochre Cove Formation. In Canberra, strongly weathered fan gravels on the east side of Black Mountain have a mixture of reversed and normal polarities, indicating initial weathering and deposition before 0.78 Ma and continued weathering since then. In north Queensland, a soil formed on a 2.46 Ma basalt flow has reversed polarity in the lower B horizon, indicating that, over the last 0.78 Ma, pedogenesis has had little or no effect on the secondary iron minerals carrying the magnetic remanence in that part of the profile.

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1996-01-01T00:00:00
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Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81440

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Australian Geological Survey Organisation

 Canberra
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Pillans, B.

 1
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Bourman, R.P.

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AGSO Journal of Australian Geology and Geophysics

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16:3:289-294

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

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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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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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eCatId/81440

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-717d-71e4-e044-00144fdd4fa6

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2018-04-20T06:07:23
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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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