Entity ID: 468043 Compiled by: Stewart, A.J. Year: 2009 Status: Defined
Last Revised: 2013
Rank: province Type: sedimentary Subtype: undefined Location: NT On-shore
Synonyms: NA Symbol: NA
Minimum age: Calymmian, 1492 ± 31 Ma Age method:
Maximum age: Orosirian, 1862 ± 5 Ma Age method: isotopic, U/Pb ion probe
Summary: The Tomkinson Province is a multiply folded sequence of Paleo- to Mesoproterozoic sedimentary rocks that overlie the Warramunga Province. The province may interfinger with the McArthur Basin beneath the Georgina and Carpentaria Basins.
State: NT Resources: Manganese Renner Springs prospect; epigenetic; no production; indicated resource 4000 t @31% Mn Resources: Manganese Bootu Creek deposit; epigenetic; prod 13 280 t @ ~42% Mn 1955-69; potential for >20 M t Mn material. Country: AUS
Parent: No data
Child Provinces: No data
Adjoins - McArthur Basin [Provinces may interfinger under Georgina and Carpentaria basins.]
Underlies - Wiso Basin
Constituent units: Rising Sun Conglomerate (In part - see key reference 65209 (NTGS Record 2005-001, p. 38)), Tomkinson Creek Group, Renner Group, Namerinni Group
Events: Tennant Region deformation Stage 3, Davenport Event (Tennant Region deformation Stage 4)
Mineral Deposits: Mucketty, Bootu Creek, Renner West
Key Reference: Donnellan, N. 2005, A framework for the Paleoproterozoic geology of the Tennant Region. IN Annual Geoscience Exploration Seminar (AGES) 2005. Record of Abstracts, Northern Territory Geological Survey Record, 2005-001, 35-40 (Refid:65209)
Comments: Maximum age is age of crystallization of felsic volcanic rock in Junalki Formation, which is unconformable below Ooradidgee Group. Minimum age is age of Renner Group (Hussey et al 2001, Helen Springs 1:250K Second Edition Explanatory Notes).
Overview: Lowest rocks are Tomkinson Creek group, consisting of siliciclastics with lesser amounts of silicic and intermediate volcanic and carbonate rocks, totalling about 10 000 m thick. The overlying Namerinni Group consists of siliciclastic and minor carbonate rocks totalling about 3000 m thick. Overlying these is the Renner Group, composed of more siliciclastic and rare carbonate rocks totalling about 1450 m thick.
Deposition of the Hayward Creek Formation, (the lowest formation of the Tomkinson Creek Group) was interrupted by tilting during Tennant Region deformation Stage 3 between about 1814 and 1811 Ma. The Tomkinson Creek group as a whole was open to tightly folded about NW-trending axes and faulted during the Davenport Event (Tennant Region deformation Stage 4) at about 1720 Ma. Later folding, Tennant Region deformation Stage 5, affected Tomkinson, Namerinni, and Renner Groups about NNW-trending axes, and was concentrated near faults. Most of the faults are subvertical, with normal and reverse movements documented.
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