Tomkinson Province

Lithology:

Sedimentary and volcanic: sandstone, dolostone, shale, basalt.

Epoch Min:

Mesoproterozoic

Epoch Max:

Palaeoproterozoic.

Age Min:

1400 Ma.

Age Max:

1780 Ma.

Summary:

Forms part of the Tennant Region. Unmetamorphosed and weakly deformed, predominantly shallow marine sedimentary rocks correlated with the McArthur Basin.

Relationship:

Overlies the Palaeoproterozoic Warramunga Province to the south, and is overlain by the Neoproterozoic to Palaeozoic Georgina and Wiso basins and Mesozoic Carpentaria Basin. Locally overlain by the Cambrian Kalkarindji Province. Likely to be continuous undercover with the Palaeo-Mesoproterozoic McArthur and Birrindudu basins.

Thichness:

At least 5 km.

Economic:

Hosts substantial stratiform manganese deposits at Bootu Creek.

Metamorphism:

Unmetamorphosed.

Main Reference:

Donnellan N, 2013. Chapter 16: Tomkinson Province: in Ahmad M and Munson TJ (compilers) ‘Geology and Mineral Resources of the Northern Territory’. Northern Territory Geological Survey, Special Publication 5