Citation

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Black, L.P., 1977. A Rb-Sr geochronological study in the Proterozoic Tennant Creek Block, central Australia. BMR Journal of Australian Geology and Geophysics  2:2:111-122. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

Rb-Sr isotopic data from total rock and mineral samples provide a broader geochronological framework than has hitherto been available for the Proterozoic rocks of the Tennant Creek Block. The oldest documented event is the amphibolite-facies metamorphism at 1920 ± 60 m.y. of possible basement rocks from the BMR 3 area, to the west-southwest of Tennant Creek township. The lower grade metamorphic rocks of the Warramunga Group were deposited before the major deformation episode which is inferred to have occurred at about 1810 m.y. Certain of the units within the Warramunga Group, of which the Bernborough Volcanics are an example; underwent isotopic resetting of total-rock systems during subsequent deformation. Granite ages range from 1797 m.y. for a phase of the Tennant Creek Granite to less than 1500 m.y. for the Cabbage Gum and Gosse River East Granites. Dated lamprophyre and porphyry samples yield ages of about 1660 m.y. and 1760 m.y., respectively. Muscovite separates from the Juno, Warrego, Golden Forty, and Nobles Nob mines suggest a common origin for the ore deposits about 1810 m.y. ago.
Google map showing geographic bounding box with values North bound -19.0 East bound 135.0 West bound 133.5 South bound -20.0
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nonGeographicDataset - GA Publication - Journal

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license
Creative Commons Attribution 3.0 Australia Licence

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Commonwealth of Australia (Geoscience Australia)

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Date (publication)

1977

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geoscientificInformation

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GA Publication
Journal
Earth Sciences

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English

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utf8

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unclassified

Geographic Extent

North bound
-19.0
East bound
135.0
West bound
133.5
South bound
-20.0

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Unknown

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pdf

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ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

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1.1

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2014-06-23

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unclassified

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Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
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