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Sandover River, Northern Territory (Second Edition). 1:250 000 Geological Map Series Explanatory Notes, SF 53-08

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Sandover River, Northern Territory (Second Edition). 1:250 000 Geological Map Series Explanatory Notes, SF 53-08 DEPARTMENT OF BUSINESS, INDUSTRY AND RESOURCE DEVELOPMENT NORTHERN TERRITORY GEOLOGICAL SURVEY SANDOVER RIVER, SF 53-03 SF 53-04 SF 54-01 FREW RIVER AVON DOWNS MOUNT ISA Northern Territory CARBEEN MILNE GEORGINA Second Edition SF 53-07 SANDOVER RIVER SF 54-05 ELKEDRA SF 53-08 URANDANGI ARGAD- BARRY Sheet SF 53-08 ARGADA GORDON PLAIN CREEK 1:250 000 GEOLOGICAL MAP SERIES EXPLANATORY NOTES SF 53-11 SF 53-12 SF 54-09 HUCKITTA TOBERMORY GLENORMISTON PD KRUSE, LC MOHAMMED, NT QLD JN DUNSTER and ML DUFFETT Government Printer of the Northern Territory Darwin, December 2002 NORTHERN TERRITORY DEPARTMENT OF BUSINESS, INDUSTRY AND RESOURCE DEVELOPMENT MINISTER: Hon Paul Henderson, MLA CHIEF EXECUTIVE OFFICER: Peter Blake NORTHERN TERRITORY GEOLOGICAL SURVEY ACTING DIRECTOR: Richard Brescianini BIBLIOGRAPHIC REFERENCE: Kruse PD, Mohammed LC, Dunster JN and Duffett ML, 2002. Sandover River, Northern Territory (Second Edition). 1:250 000 geological map series explanatory notes, SF 53-08. Northern Territory Geological Survey, Darwin. (1:250 000 geological map series, ISSN 0814-7485) Bibliography ISBN 0 7245 7050 0 (Hard copy), ISBN 978-0-7245-7137-6 (CD version) 559.429 EDITOR: TJ Munson KEYWORDS: Geological mapping, Geophysical interpretation, Structural geology, Economic geology, Sedimentary geology, Stratigraphy, Northern Territory, Sandover River, Palaeoproterozoic, Cambrian, Ordovician, Cenozoic, Altjawarra Domain, Georgina Basin. For further information contact: Reference Geologist Northern Territory Geological Survey GPO Box 3000 Darwin NT 0801 Phone: +61 8 8999 5281 Web site: http://www.minerals.nt.gov.au/ntgs 1 Formerly Australian Geological Survey Organisation (Geoscience Australia) © Northern Territory Government 2002 Printed for the Northern Territory Geological Survey by the Government Printer of the Northern Territory Disclaimer This information is provided on the understanding that the user agrees to release and indemnify the Northern Territory, the Commonwealth of Australia, companies who supplied and acquired open le data, and their employees, agents and contractors, in respect of all liability for actions, claims costs or expenses, loss damage or injury, which may be suffered by them, or any other person, arising from the use of the data, or as a consequence of any unlawful or negligent act or omission of the user.(H ii ABSTRACT SANDOVER RIVER1 encompasses a portion of the southern Georgina Basin. Unmetamorphosed and essentially undeformed Late Cambrian to Early Ordovician and Cenozoic sedimentary rocks cover the sheet area. In the subsurface, basement metavolcanic schist and Middle to Upper Cambrian sedimentary units have been intersected in drillholes. The platformal marine Thorntonia Limestone was deposited in the early Middle Cambrian during a widespread marine trans- gression. This unit consists predominantly of dolostone, with local basal terrigenous sediments and a medial interval bearing pyritic-carbonaceous black shale interbeds. It largely coincides with the Middle Cambrian depositional sequence 1. Sequence 2, spanning the remainder of the Middle Cambrian, is primarily of Arthur Creek Formation and includes a basal interval of anoxic, basinal pyritic-carbonaceous black shale which constitutes a major potential petroleum source rock. The upper Arthur Creek Formation is of aerobic carbonate, deposited in normal marine waters. Quartzic dolostone and quartz sandstone of the overlying Steamboat Sandstone in the eastern sheet area complete sequence 2. The Late Cambrian Arrinthrunga Formation is primarily peritidal. It includes calcimudstone, microbial laminite, peloid/in- traclast and ooid grainstone, stromatolite boundstone and quartzic limestone and their dolomitised equivalents, together with minor quartz sandstone. The evaporitic Chabalowe Formation (including the Hagen Member) occurs in the western sheet area subsurface and is equivalent to the basal Arrinthrunga Formation. Cambro-Ordovician deposition consisted of two principal depofacies: peritidally in uenced, platformal marine carbonate rocks of the Ninmaroo Formation in the east, which inter nger with terrigenous quartz-glauconite sandstone of the marine Tomahawk Formation in the west. The corridor of inter ngering falls within the southern sheet area. Continental Cenozoic deposits indicate pedogenic and lacustrine (Austral Downs Limestone), and other terrestrial environ- ments. The southern Georgina Basin is strongly prospective for petroleum. Excellent potential source rocks and seal in the lower Arthur Creek Formation are juxtaposed against potential reservoir dolostone in the underlying Thorntonia Limestone. The Ha- gen Member is also prospective, offering vuggy dolostone reservoir rocks and an evaporite seal. Diamonds are being actively sought in the region, but no metalliferous occurrences are known. 1 Names of 1:250 000 and 1:100 000 mapsheets are shown in large and small capital letters, respectively, eg SANDOVER RIVER, ARGADARGADA. iii CONTENTS 3 Porosity, density and magnetic susceptibility data of drillhole Ross 1 .................................................... 22 Abstract ............................................................................iii Introduction ...................................................................... 1 FIGURES Terminology and classification ................................... 1 Location and access .................................................... 1 1 Location of SANDOVER RIVER .............................. 1 Climate ........................................................................ 2 2 Regional geological setting ........................................ 3 Physiography ............................................................... 2 3 Simplified solid geology ............................................. 4 Vegetation ................................................................... 2 4 Metavolcanic rock ...................................................... 6 Previous investigations ............................................... 2 5 Marly dolomudstone interbeds in Regional geological setting .............................................. 2 Arrinthrunga Formation ............................................. 9 Stratigraphy ...................................................................... 4 6 Flat-pebble intraclast conglomerate in Palaeoproterozoic ................................................................ 4 Arrinthrunga Formation ............................................. 9 Metavolcanic rock (LPlv) .............................................. 4 7 Nodular evaporite in dolomudstone of Cambrian ............................................................................. 4 Arrinthrunga Formation ............................................. 9 Thorntonia Limestone (–Cmt) ...................................... 4 8 Domical stromatolite in Arrinthrunga Arthur Creek Formation (–Cma) .................................. 6 Formation ................................................................. 10 Steamboat Sandstone (–Cms) ....................................... 7 9 Siliceous nodules in Arrinthrunga Formation ...........11 Chabalowe Formation (–Cuc) ...................................... 7 10 Ovoid concretions in Arrinthrunga Formation ..........11 – – Arrinthrunga Formation (Cua) .................................... 8 11 Asymmetric ripples in unit Cuas of Cambro-Ordovician .......................................................... 10 Arrinthrunga Formation ............................................11 – – Tomahawk Formation (COt) .................................... 10 12 Tabular quartz sandstone in unit Cuas of Ninmaroo Formation (–COn) ..................................... 14 Arrinthrunga Formation ........................................... 12 Palaeogene-Neogene ......................................................... 16 13 Tomahawk Formation quartz sandstone Austral Downs Limestone (Cza) ............................... 16 ridge overlying dolostone interbed ........................... 13 Palaeogene-Neogene-Quaternary ..................................... 17 14 Intraformational conglomerate in Quaternary ......................................................................... 18 Tomahawk Formation ............................................... 13 Structure and tectonics .................................................. 19 15 Intraformational conglomerate in Geophysics ...................................................................... 19 Tomahawk Formation ............................................... 14 Gravity ...................................................................... 20 16 Dolograinstone bed in basal dolostone unit – Magnetics .................................................................. 20 COtd of Tomahawk Formation ................................. 14 Radiometrics ............................................................. 20 17 Deformation in quartz sandstone of Downhole geophysics ............................................... 21 Tomahawk Formation ............................................... 15 Geological history ........................................................... 21 18 Wavy to columnar stromatolites in Economic geology ........................................................... 22 Ninmaroo Formation ................................................ 15 Petroleum .................................................................. 22 19 Columnar stromatolites in Ninmaroo Formation ..... 16 Diamonds .................................................................
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