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Isotopic age of the Tollu Volcanics, W.A.

Isotopic age of the Tollu Volcanics, W.A.
Isotopic age of the Tollu Volcanics, W.A.
The Tollu Volcanics have been dated by the Rb-Sr isochron method at 1060 ± 140 million years (95% certainty limit). The folded volcanics have an initial 87Sr/86Sr ratio of 0.705 and the scatter of the total-rock points about the isochron is ascribed to post-crystallisation redistribution of Rb and Sr. A rhyolite specimen from the Warburton area to the west fits on the isochron without significantly increasing the statistical error. The geological setting of
the volcanics is briefly described. The importance of this age to the dating of the Late Proterozoic sedimentary sequence of the region is pointed out.
0812-0099
235-238
Compston, W.
ab4ac3bd-d626-4155-a102-97d8cd7f34d2
Nesbitt, R.W.
6a124ad1-4e6d-4407-b92f-592f7fd682e4
Compston, W.
ab4ac3bd-d626-4155-a102-97d8cd7f34d2
Nesbitt, R.W.
6a124ad1-4e6d-4407-b92f-592f7fd682e4

Compston, W. and Nesbitt, R.W. (1967) Isotopic age of the Tollu Volcanics, W.A. Journal of the Geological Society of Australia, 14 (2), 235-238. (doi:10.1080/00167616708728661).

Record type: Article

Abstract

The Tollu Volcanics have been dated by the Rb-Sr isochron method at 1060 ± 140 million years (95% certainty limit). The folded volcanics have an initial 87Sr/86Sr ratio of 0.705 and the scatter of the total-rock points about the isochron is ascribed to post-crystallisation redistribution of Rb and Sr. A rhyolite specimen from the Warburton area to the west fits on the isochron without significantly increasing the statistical error. The geological setting of
the volcanics is briefly described. The importance of this age to the dating of the Late Proterozoic sedimentary sequence of the region is pointed out.

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Published date: 1967
Organisations: Geochemistry

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Local EPrints ID: 361896
URI: http://eprints.soton.ac.uk/id/eprint/361896
DOI: doi:10.1080/00167616708728661
ISSN: 0812-0099
PURE UUID: 1a3dfa09-fb28-4a10-bddd-dc0db6c0b34f

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Date deposited: 05 Feb 2014 13:38
Last modified: 14 Mar 2024 15:57

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Contributors

Author: W. Compston
Author: R.W. Nesbitt

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