The Willyama Supergroup in the Nardoo and Mount Woowoolahra Inliers
This issue of the Quarterly Notes discusses the Nardoo and Mount Woowoolahra Inliers, which lie 100 km north and 90 km north-northwest, respectively, of Broken Hill, in far western New South Wales.
Both inliers contain rocks which belong to the Palaeoproterozoic Willyama Supergroup. Geological mapping of the inliers shows that they both contain graphitic to non-graphitic psammitic, psammopelitic and pelitic metasediments.
The Nardoo Inlier contains a significant amount of pegmatite and intermixed pegmatite and granitoid while Mundi Mundi type granite is common in the Mount Woowoolahra Inlier.
Structural fabrics and metamorphic mineral assemblages within the inliers are consistent with those observed in the nearby Broken Hill and Euriowie Blocks.
The metasediments are considered to form part of the Paragon Group. However, it is not clear if they can be correlated with other occurrences of the Paragon Group in the Broken Hill and Euriowie Blocks, or whether they are a separate (stratigraphically higher) part of the Paragon Group.
The recent finding that the Paragon Group in the Broken Hill Block is a time equivalent of stratigraphic units which host significant Pb–Zn deposits in the Mount Isa Inlier in Queensland, increases the prospectivity of the Paragon Group. Understanding its distribution and characteristics has, hence, become important.
To obtain hard copies or join the mailing list for this publication, contact simone.meakin@dpi.nsw.gov.au.
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