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

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Created 13/01/2025

Updated 13/01/2025

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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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Title The Brunhes/Matuyama Polarity Transition (0.78 Ma) as a chronostratigraphic marker in Australian regolith studies
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/7b9ac03d-5c61-4d8c-b7fb-07b4f93150ea
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[127.7, -43.89], [155.38, -43.89], [155.38, -10.05], [127.7, -10.05], [127.7, -43.89]]]}
Data Portal data.gov.au

Data Source

This dataset was originally found on data.gov.au "The Brunhes/Matuyama Polarity Transition (0.78 Ma) as a chronostratigraphic marker in Australian regolith studies". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/the-brunhes-matuyama-polarity-transition-0-78-ma-as-a-chronostratigraphic-marker-in-australian-