Metallogenic episodes of the Tasman fold belt system, eastern Australia
Metallogenic episodes of the Tasman fold belt system, eastern Australia (in A special issue on the metallogeny of the Tasman fold belt system of eastern Australia, J. L. Walshe (editor), K. G. McQueen (editor) and S. F. Cox (editor))
Economic Geology and the Bulletin of the Society of Economic Geologists (October 1995) 90 (6): 1443-1466
- absolute age
- alteration
- Ar/Ar
- Australasia
- Australia
- base metals
- Cambrian
- copper ores
- dates
- deformation
- Devonian
- Drummond Basin
- emplacement
- gold ores
- Hellyer Deposit
- igneous activity
- igneous processes
- K/Ar
- Lachlan fold belt
- metal ores
- metallogenic epochs
- metals
- mineral deposits, genesis
- mineralization
- Mount Read Volcanics
- New South Wales Australia
- Ordovician
- Paleozoic
- precious metals
- Queensland Australia
- Silurian
- Tasman orogenic zone
- Tasmania Australia
- eastern Australia
- Anakie Inlier
Precise dating of alteration minerals and host rocks to Au and base metal deposits in the Tasman fold belt system, eastern Australia, has established a number of distinct metallogenic epochs which correspond to episodes of magmatism or to deformation events. Base and precious metal mineralization was emplaced in the Mount Read Volcanics, Tasmania, at about 500 Ma, and other hydrothermal or deformational events may have occurred in the Hellyer deposit between approximately 480 and 440 Ma. Copper and Au mineralization was emplaced in the Lachlan fold belt, New South Wales, at about 440 Ma, and appears to be related to the end stages of Ordovician magmatism that spans a period from approximately 480 through to 440 Ma. Gold deposits (+ or - base metals), which formed in New South Wales and Tasmania at about 420 to 380 Ma, are essentially coeval with deformation and/or are broadly related to Siluro-Devonian magmatism that largely occurred from about 420 to 390 Ma. Gold mineralization in the Anakie inlier, northeast Drummond basin, North Queensland, was essentially coeval with the emplacement of the host Drummond sequence at about 350 Ma.