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Published in:
2005 | OriginalPaper | Chapter
Syn-metamorphic dates for tourmaline formation around Mount Isa, north-west Queensland, Australia
Authors : Robert J. Duncan, Andy R. Wilde, Roland Mass, Katherine Bassano
Published in: Mineral Deposit Research: Meeting the Global Challenge
Publisher: Springer Berlin Heidelberg
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Pb stepwise leaching of tourmaline from the Palaeoproterozoic Western Fold Belt of the Mount Isa Inlier yield dates of 1559±17 Ma, 1577±52 Ma and 1480±90 Ma. Structural, petrological and textural data suggest that 1559±17 Ma is the best estimate for peak metamorphism in the area. Estimates of Pb closure temperature and comparison with peak metamorphic temperatures indicate that this age represents tourmaline crystallisation. These dates represent syn-metamorphic fluid flow and indicate metal mobility during the Isan Orogeny. A result of this event is regional-scale silicification that has the same relative timing as extensive silica deposition in the rocks that now host the Cu orebodies at Mount Isa.