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Lead Isotope Evolution of Mineral Deposits in the Proterozoic Throssell Group, Western Australia


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Anderson, BR, Gemmell, JB and Nelson, DR 2002 , 'Lead Isotope Evolution of Mineral Deposits in the Proterozoic Throssell Group, Western Australia' , Economic Geology, vol. 97, no. 4 , pp. 897-911 , doi: 10.2113/97.4.897.

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The Meso-Neoproterozoic Throssell Group of the Paterson orogen in Western Australia hosts the Nifty and
Maroochydore sediment-hosted, replacement Cu deposits, as well as subeconomic Pb-Cu-Au veins at
Goosewacker, carbonate-hosted Zn-Pb at Warrabarty, and pyritic massive sulfide at Grevillea. We report new
Pb isotope data for the Nifty deposit and the Rainbow and Grevillea prospects. These data are combined with
published and unpublished data to characterize the Pb isotope signatures of the deposits and prospects in the
Throssell Group. In addition these data are integrated into a model for the sources of Pb in the mineralizing
Lead isotope data from mineralized occurrences in the Throssell Group plot as a linear trend in 207Pb/204Pb-
206Pb/204Pb space. Deposits and prospects are arranged, from least to most radiogenic, as Rainbow, Warrabarty,
Nifty, Goosewacker, and Maroochydore, along the trend. Secondary isochron or mixing isochron models were
previously proposed to interpret the Pb isotope trend for mineral deposits and prospects in the Throssell
Group. Our investigation shows that the linear trend does not represent an isochron due to the syngenetic (pre-
D4) timing for mineralization at Warrabarty and Rainbow compared to an epigenetic (syn-D4) timing for Maroochydore,
Nifty, and Goosewacker. We propose a source-mixing model, with no time dependency, to explain
the deposit Pb isotope linear trend where Pb from a primitive, mantle source (Pilbara Craton, μ = 9.88) is
mixed with crustal Pb (Throssell Group sedimentary rock derived from the Rudall Complex, μ = 10.55). The
position of deposits and prospects along the trend suggests that the Warrabarty and Rainbow prospects have
more primitive Pb and that the Maroochydore deposit contains Pb from primarily a crustal source. The Nifty
deposit, and the Goosewacker and Grevillea prospects, contain a mixture of both primitive and crustal Pb.

Item Type: Article
Authors/Creators:Anderson, BR and Gemmell, JB and Nelson, DR
Keywords: metallogeny, basin evolution, hydrothermal, lead sources, erxploration implications
Journal or Publication Title: Economic Geology
ISSN: 0361-0128
DOI / ID Number: 10.2113/97.4.897
Additional Information:

Copyright 2002, Society of Economic Geologists.

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