Establishing an interconnected mineralisation history of the Mount Isa Province and the Peake and Denison Domain, northeastern Gawler Craton
Date
2023
Authors
Gully, D.
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Abstract
The Mesoproterozoic period saw extensive IOCG mineralisation of the Mount Isa Province at c. 1550-1490 Ma. Tectonic reconstructions of Paleoproterozoic and early Mesoproterozoic Australia situate the Peake and Denison Domain of the northeastern Gawler Craton at the boundary of the NAC and SAC during this time. Recent geochronology of zircon and titanite suggests an interconnected hydrothermal history between the Peake and Denison Domain and Mount Isa Province during the early Mesoproterozoic. This project presents new U-Pb LA-ICP-MS geochronology of zircon and titanite, and multi-method (U-Pb, Lu-Hf) LA-ICP-MS geochronology of apatite from IOCG-style mineralised core of the Peake and Denison Domain. Zircon analysis interprets a c.1775 Ma upper intercept age for the metasedimentary protolith. Titanite analysis constrains the timing of mineralisation to 1500 Ma. Apatite U-Pb analysis presents mineralisation ages of c.1490-1470 Ma, while Lu-Hf analysis constrains the timing of mineralisation to c.1530-1490 Ma. These results suggests that the c.1550-1490 Ma mineralising systems of the Mount Isa Province also governed the Peake and Denison Domain and subsequent northeastern Gawler Craton, separate from the c.1600-1570 Ma mineralising system of the central Gawler Craton. These interpretations align with the Mesoproterozoic amalgamation of the NAC and SAC. Establishing an interconnected mineralisation history of the Peake and Denison Domain and Mount Isa Province implies that the northeastern portion of the Gawler Craton is likely prospective for Isan-style mineralisation, thereby creating incentive for future mineral exploration.
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School of Physical Sciences
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Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, YEAR
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