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The ages of Proterozoic granites in the Georgetown Inlier of northeastern Australia, and their relevance to the dating of tectonothermal events

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Created 20/01/2025

Updated 20/01/2025

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U-Pb zircon SHRIMP ion-microprobe ages are presented for five Proterozoic igneous rocks from the Georgetown Province of northeastern Queensland. Four of these are interpreted as the igneous crystallisation ages of the Croydon Volcanic Group (1548±18 Ma), Lighthouse Granite (1561±10 Ma), Digger Creek Granite (1554±10 Ma), and Mount Hogan Granite (1549±25 Ma). Most of the zircon within the Forest Home Trondhjemite is apparently xenocrystic, being rounded cores that crystallised at 1650±17 Ma; the time of emplacement is not known with certainty, but is thought to be better represented by a 1553±46 Ma Rb-Sr isochron age. The U-Pb zircon emplacement ages are internally consistent in constraining the age of a prograde, intense tectonothermal event (D2) in the province to 1554±10 Ma. This is about 80 Ma older than a previous estimate for the age of this event, based on the correlation of Rb-Sr whole-rock isochron ages and the development of a penetrative (S2) fabric. The use of that particular Rb-Sr technique in terranes of this type should therefore be treated with considerable caution.

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Title The ages of Proterozoic granites in the Georgetown Inlier of northeastern Australia, and their relevance to the dating of tectonothermal events
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/16ddd05c-09e2-4cdc-bec6-c1ca28c3777a
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[142.0, -20.0], [146.0, -20.0], [146.0, -16.0], [142.0, -16.0], [142.0, -20.0]]]}
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "The ages of Proterozoic granites in the Georgetown Inlier of northeastern Australia, and their relevance to the dating of tectonothermal events". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/the-ages-of-proterozoic-granites-in-the-georgetown-inlier-of-northeastern-australia-and-their-r