Uranium ore-forming systems of the - Geoscience Australia

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Uranium ore-forming systems of the Lake Frome regionLocality 14 (353980E ; 6664830N) Four Mile Creek - Dead Tree SectionA key stratigraphic section adjacent to the Four Mile West uranium mineralisation has recently beenrecognised by University of Adelaide and PIRSA researchers within an ephemeral stream tributaryof Four Mile Creek. This section includes:the basal Mesozoic lithic gravels (possibly equivalent to the Algebuckina Sandstone);a complete sequence of Eyre Formation sediments extending from the basal quartzosegravel, through sediments laterally equivalent to those that host the Four Milemineralisation and the uppermost pedogenic silcrete (equivalent to the 'Cordillo Silcrete');and,Lower energy proximal fluvial sands of the Namba Formation.The sedimentary section extends for over 150 m and may contain evidence of cryptic signaturesrelating to fluid migration and residence associated with the Four Mile mineralisation. The exposedsediments are now oxidised and therefore any prospect of hosting significant uranium mineralisationis low. However because parts of this sequence are laterally equivalent to the adjacent Four Milemineralisation they may have previously hosted mineralisation.The compilation and description of this section is presently being finalised by Steve Hill (Universityof Adelaide) and Steve Hore (PIRSA) and is due for submission for publication in 2009.Page 139 of 151
Uranium ore-forming systems of the Lake Frome regionAPPENDIX 2: METADATA FOR 3D GEOLOGICAL MAPS, FIGURES 3.3-3.7.Map Symbol Stratigraphic Name Stratigraphic Descriptionbr Unnamed GIS Unit - see description Breccia, undifferentiated.br3 Unnamed GIS Unit - see description Diapiric brecciaCgl Merrimelia Formation Conglomerate, polymict, framework supported, massive;fluvio-glacial conglomerate, diamictite and sandstone.Glacigene, deep-water lacustrine rhythmites, fluvio-glacialoutwash, etc.CP-g Mount Gee Sinter Quartz-haemetite, rhythmically layered, vuggyCPgi Tirrawarra Sandstone Conglomerate; sandstone, medium to coarse-grained;mudstone.Fluvial, alluvial fans, distal proglacial outwash,backswamp, minor coal.CP-r Radium Ridge Breccias Breccia, granitic, chloritic and haematitic. Includedsediments and diamictite blocks.dl Unnamed GIS Unit - see description Dolerite, undifferentiated.dl1 Unnamed GIS Unit - see description Dolerite in diapiric breccia. Based on green unit in CallannaBeds on ANDAMOOKAdl2 Unnamed GIS Unit - see description Dolerite, quartz porphyry, aplite. Based on "diorite" inMelrose Diapir on ORROROO.dw Unnamed GIS Unit - see description Deep weathering, undifferentiatedE Unnamed GIS Unit - see description Undifferentiated Cambrian rocksED1 Unnamed GIS Unit - see description Soda leucogranite, white, medium grained. Based on redunit on COPLEYEf Lake Frome Group Sandstone; siltstone; shale; limestone; conglomerate.Efb Balcoracana Formation Siltstone, very micaceous; shale; carbonate; sandstone,arkosic, fine-grained and crossbedded. Trilobite tracks.Efm Moodlatana Formation Siltstone, micaceous; shale; arkosic fine to medium-grainedsandstone; minor carbonateEfp Pantapinna Sandstone Sandstone, feldspathic, red, white, fine to medium-grained;minor micaceous siltstone and shaleEh Hawker Group Limestone, siltstone, shale; lesser sandstone, greywacke,sandstone.Ehd Midwerta Shale Shale, green-grey to black, argillaceous pyritic andmanganiferousEhi Wirrapowie Limestone Limestone and calcareous siltstone, green and grey,stromatolitic, intraformational conglomerate; minor crossbedded ooid grainstone.Ehj Ajax Limestone Limestone, reefs, flat-topped, keep-up. Lower thick-beddedand upper nodular limestone.Ehm Moorowie Formation Shale; siltstone; shelf margin oolite; reef limestone;Eho Oraparinna Shale Shale, calcareous.Ehp Parachilna Formation Sandstone, upward-fining; with siltstone and minorcarbonate interbeds. Trace fossils include Diplocraterion,and BemellaEhq Woodendinna Dolomite Dolomite; shale; conglomerate.Page 140 of 151
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