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Pb-isotope data from base-metal deposits in central Australia: implications for Proterozoic stratigraphic correlations

Created 17/10/2025

Updated 17/10/2025

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Pb-isotope data for samples of lead-bearing minerals collected in central Australia provide useful age information, based on recently developed Pb-isotope mixing models. The Strangways Metamorphic Complex and the Bonya Metamorphics in the Arunta Block are hosts to stratabound base-metal lodes with model Pb-ages clustered with that of vesicle-filling galena from the lower Hatches Creek Group in the southern Tennant Creek Block. It is suggested, therefore, that these units in the northern and central Arunta Block are time-depositional equivalents of the Hatches Creek Group, the age of which has been independently established by zircon geochronology as 1820-1810 Ma. This time interval was an episode of extension, rift-style deposition and generation of volcanogenic base-metal deposits in the northern and central Arunta Block. The model Pb-age of the Oonagalabi prospect, and hence its host, the Bungitina metamorphics, appears younger than that for the Strangways Metamorphic Complex, but field evidence requires a more complex interpretation, involving metasomatic addition of radiogenic lead. Other deposits in the northern Arunta Block have Pb-isotope characteristics that show they are younger than their host rocks, and are thus related to granite intrusion or later tectonism. Home of Bullion lead has a range of compositions that can be interpreted to indicate formation probably in the Late Proterozoic. The isotopic composition of lead in the gold lodes of the Tennant Creek district indicates model Pb-ages consistent with introduction shortly after deposition of their host rocks, during folding and granite emplacement.

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Title Pb-isotope data from base-metal deposits in central Australia: implications for Proterozoic stratigraphic correlations
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/1d04142f-e2b0-4df2-83ae-db55638f5a8b
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Pb-isotope data from base-metal deposits in central Australia: implications for Proterozoic stratigraphic correlations". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/pb-isotope-data-from-base-metal-deposits-in-central-australia-implications-for-proterozoic-stra