Authors / CoAuthors
Warren, R.G. | Thorpe, R.I. | Dean, J.A. | Mortensen, J.K.
Abstract
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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document
eCat Id
81413
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Keywords
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- GA PublicationJournal
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- NT
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_External
Publication Date
1995-01-01T00:00:00
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geoscientificInformation
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AGSO Journal of Australian Geology and Geophysics 15:4:501-509
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[-24.5, -20.0, 130.0, 138.0]
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