Implications of AEM for uranium in the Paterson area
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1 Implications of AEM for uranium in the Paterson area Songfa Liu, Subhash Jaireth, David Huston, Ian Roach Onshore Energy and Minerals Division, Geoscience Australia GPO Box 378, Canberra ACT 2601
2 Outline of this presentation Miles mineral system : late stage of Yeneena Basin development initial inversion of Yeneena Basin during Miles Orogeny Implications of AEM for uranium in Paterson : Unconformity related uranium mineral system U-Cu mineral system associated with the Broadhurst- Coolbro contact Sandstone-hosted uranium mineral system Calcrete-hosted uranium mineral system
3 Mineral occurrences & deposits in Paterson Fig. 6.a Most known U in Rudall Complex (Coolbro-Rudall unconformity) Association of U with Cu-Pb-Zn Newly interpreted major faults: East Waukarlycarly Fault Havieron Fault Trotman Hill Fault West Waukarlycarly Fault Coolbro Fault Maroochydore Fault
4 New geochronology ~~~~~~~~ Paterson Orogeny ~ 650 Ma ~~~~~~~~~ ~~~~~~~~ Miles Orogeny ~ 810 Ma ~~~~~~~~~ Tarcunyah Group Lamil Group Throssell Range Group ~ 860 Ma felsic Ma ~~~~~~ Yapungku Orogeny ~ Ma ~~~~~ Rudall Complex
5 Miles mineral system NEXT: U mineral systems in Paterson Two-event model: Ma: late Yeneena Basin development extension - downward fluid movement basin thickness >10km basinal brines during diagenesis additional heat flow: mafic intrusions ( Ma) trap rocks in basement deposition of U, Cu-Zn- Pb, Au, and platinum group Ma: initial inversion of Yeneena Basin normal faults during basin formation thrusts, & folding upward fluid movement fluids interact with traps at the Coolbro-Broadhurst contact, or carbonaceous and carbonate-rich intervals at higher levels in Broadhurst Formation Cu, U and other metals, also as consequence of reduction enriched in Cu ~830Ma mafic rocks as Cu sources U, Cu & U-Cu-Zn-Pb mineral systems & zoning deposit scale regional scale
6 Uranium mineral systems in Paterson Basinal fluid related: Unconformity-related U Diagenetic fluid-related U-Cu Sandstone-hosed U Calcrete-hosted U NEXT: U mineral systems in Paterson after Skirrow et al. (2009)
7 Unconformity related uranium system Critical components : unconformity uranium-rich source rocks thick (5-7km) fluviatile sandstone package reductants faults closely associated with unconformity: spatially (with 100s m of unconformity) process (fluid movement along unconformity & faults)
8 Neoproterozoic unconformities in Paterson Neoproterozoic unconformities (image) : Tarcunyah-Archean Eel Creek, Waroongunyah, & Googehnama Fms over Archean Pilbara Craton & Fortescue Basin Yeneena-Rudall Coolbro Sandstone over Rudall Complex Coolbro Sandstone-Taliwanya Formation over Rudall Complex Karara-Rudall Karara Formation over Rudall Complex NEXT: Tarcunyah-Archean unconformity
9 Tarcunyah-Archean unconformity: Cover: Eel Creek, Waroongunyah & Googhenama Formations North Paterson (image) : Basement: Fortescue Basin & Pilbara Craton Googhenama-Archean unconformity: Mapped in surface & solid geology Depicted in AEM data Googhenama Formation: Sandstone & conglomerate (contains locally derived granitic and gneissic clasts) Uranium sources: Felsic igneous rocks in Pilbara Craton & Fortescue Basin Trap rocks: Pelitic sediments & mafic rocks in Fortescue Group Mafic igneous rocks in Pilbara Craton Moderate to high potential, moderate certainty NEXT: Coolbro-Rudall unconformity
10 Coolbro / Rudall unconformity (image): Coolbro Sandstone granitic gneiss Yandagooge Formation Rudall Complex (undivided)
11 Coolbro / Rudall unconformity (image): Coolbro Sandstone granitic gneiss Yandagooge Formation Rudall Complex (undivided)
12 Trap rocks in Rudall Complex & Coolbro Sst (image): In Rudall Complex graphitic schist (Yandagooge Fm) mafic & ultramafic rocks BIFs In Coolbro Sandstone shale and pelitic schist calcareous shale
13 Coolbro / Rudall unconformity Coolbro / Rudall unconformity Unconformity U source in granitic rocks in Rudall Complex Coolbro Sandstone: fluviatile Reductants in Rudall Complex (and Coolbro Sandstone) Faults, particularly NNW thrusts High potential, high certainty NEXT: Taliwanya-Coolbro / Rudall unconformity
14 Taliwanya-Coolbro / Rudall unconformity Unconformity U source in granitic rocks in Rudall Complex (image): Taliwanya Fm & Coolbro Sandstone Reductants in Rudall Complex (and Pungkuli Fm) Faults High potential, moderate to high certainty NEXT: Karara / Rudall unconformity
15 Unconformity Karara / Rudall unconformity U source in granitic rocks in Rudall Complex (image): Karara Formation: sandstone & conglomerate Reductants in Rudall Complex (mafic & ultramafic) Faults High potential, moderate certainty NEXT: U-Cu with Broadhurst - Coolbro contact Karara / Rudall unconformity
16 U-Cu mineral system associated with the Broadhurst-Coolbro contact Assessment of potential : Broadhurst-Coolbro contact (solid geology) Reduced parts of Broadhurst Formation conductive zone (AEM data) Fluid pathways (surface and solid geology) Indications of alteration and deposition of uranium (surface geology mapping & remotely sensed data) iron-oxide alteration zone sericite composition from ASTER data Much work to be done
17 Broadhurst Formation Parts very conductive North Paterson: AEM depth-slice image at 200m): carbonaceous & sulfidic shale up to 10% pyrite & pyrrhotite near base of unit, distinctive magnetic signature (Hickman & Clarke 1993) At Maroochydore 70 Siemens/m in mineralised horizon & footwall carbonaceous shale (Reed 1996) Map subsurface host sequence & structure Map regionally
18 Conductive Broadhurst Formation 20 km Lakes and selected AEM sections over pre-mesozoic solid geology
19 U-Cu mineral system associated with the Broadhurst-Coolbro contact Fig. 6.a Known mostly in two areas Maroochydore and Broadhurst- Sunday Creek Rainbow-Nifty-Finch Near major crustal scale faults Coolbro Fault Maroochydore Fault Mt Eva and Camel-Tabletop Fault Zone McKay Fault Vine Fault Potential in other areas?
20 Muscovite ASTER minerals index map with Pima samples overlay unpublished results from Czarnota et al. BR1-5,8 BR7 GA2 BR9 BR10 GA1 uranium prospect AlOH absorption feature wavelength (nm ) Muscovite Phengite Alteration mapping from ASTER data Muscovite alteration at Broadhurst-Coolbro contact Fluid pathway in up part of Coolbro Sst Evidence for Miles mineral system Sunday Creek U Sunday Creek NEXT: sandstone-hosted U
21 Sandstone-hosted U mineral system Two types: Confined aquifers: roll-front & tabular types Paleochannels: basal channel type Continental fluvial or marginal marine (mixed fluvial-marine) sediments
22 Sandstone-hosted U mineral system Confined aquifers : roll-front & tabular types roll front deposit: e.g., new discovery by Heathgate Resources, west of Beverley, SA Single fluid or two fluids after Jaireth et al. (2008) Uranium transported in oxidised shallow-level ground water deposited due to reduction by in situ organic materials (plant debris, amorphous humate, marine algae) or other reductants (sulfides, Fe +2 -bearing silicates and oxides) or mobile reductants (hydrocarbons and/or H 2 S) reductants Similar chemistry for paleochannel type but U transported in surface water
23 Sandstone-hosted U mineral system Paleochannels: basal channel type meandering bends of main channel confluence of main channel with tributary channels Beverley Hill (after Jaireth et al. 2010)
24 Sandstone-hosted U mineral system Possibilities in Paterson: Permian-recent paleovalleys / paleochannels: moderate to high potential Mesozoic: low potential lack of uranium rich source rocks Permian: moderate potential Neoproterozoic: low potential lack of plant derived organic materials
25 Permian solid geology with glacial flow directions Oakover Valley Waukarlycarly Embayment Rudall West labelled: Permian paleovalleys Canning Paleovalley South of Telfer Rudall West Disappointment Paleovalley Paterson Formation: fluvioglacial sequence lack of info on reductants: in situ organic materials or other reductants potential of mobile reductants: e.g., hydrocarbons Paleovalleys : Oakover Valley (A) Rudall West (B) Rudall Central (C) South of Telfer (D) Canning Paleovalley (E) Disappointment Paleovalley Waukarlycarly Embayment
26 North Paterson (image) : AEM depth slice image at 200m in Paterson North Waukarlycarly Embayment Canning Paleovalley
27 Canning Paleovalley? Flow direction $U $U $U AEM interp $U $U TELFER!( TELFER Kilometers
28 Paleovalley-type sandstone-hosted uranium mineral system --- Disappointment Paleovalley South Paterson (image) : AEM depth slice image at 200m of Paterson South survey area
29 Disappointment Paleovalley $U Disappointment Paleovalley Flow direction $U $U $U AEM interp $U Kilometers
30 Calcrete-hosted U mineral system Schematic diagrams showing stages in the formation of calcrete-hosted uranium deposits (modified after Thomas 2007) Carnotite: K(U +6 O 2 )(V +5 O 4 ).xh 2 O K & U leached from felsic rocks and V from mafic and Fe-rich sediments Calcrete-hosted U in 3 stages: fill of coarse sediments evaporation calcrete, which acts as aquifer seasonal fluctuation of water table a/with evaporation increase concentration of K, V & U precipitation of carnotite, or, mixing of valley ground water with more saline lake waters (higher in K & Ca)
31 Calcrete-hosted U mineral system Essential components: source rocks of uranium source rocks of vanadium drainage system with recharge and discharge areas (e.g., playa lake) paleovalleys / paleochannels with calcrete
32 Calcrete-hosted U mineral system Lake Waukarlycarly Rudall River Lake Auld Percival Lakes Tobin Lake Potential areas in Paterson: Lake Waukarlycarly Lake Disappointment W Lake Disappointment SE Lake Winfred Lake Auld Percival Lakes Tobin Lake Rudall River Lake Winfred Lake Disappointment Essential components source rocks of uranium source rocks of vanadium drainage system with recharge and discharge areas (e.g., playa lake) paleovalleys / paleochannels with calcrete U & V sources, calcrete, & drainage systems with flow directions in the Paterson area
33 Calcrete-hosted U mineral system Lake Waukarlycarly Percival Lakes Tobin Lake Rudall River Lake Auld Lake Winfred Lake Disappointment Prospectively map (potential and certainty)
34 Calcrete-U system: Lake Waukarlycarly U sources: Pilbara Craton Rudall Complex Mt Crofton granite suite V sources: Pilbara Craton Rudall Complex Drainage systems: Canning Paleovalley (Percival Paleovalley system) Between Nifty, Telfer & Kin tyre Calcrete: rim around lake & in paleovalleys Moderate to high potential Lamil Hill U prospect
35 Calcrete-hosted U mineral system Lake Waukarlycarly Percival Lakes Tobin Lake Rudall River Lake Auld Lake Winfred Lake Disappointment Prospectively map (potential and certainty)
36 Calcrete-hosted uranium mineral system Disappointment Paleovalley South Paterson (image) : AEM depth slice image at 200m of the South Paterson Survey area NEXT: Conclusions
37 Regional AEM data : Conclusions assist uranium potential assessment Potential for uranium mineral systems unconformity-related Tarcunyah-Archean unconformity Yeneena-Rudall unconformity Karara-Rudall unconformity stratiform U-Cu with the Broadhurst-Coolbro contact sandstone-hosted U Paterson Formation Permian and younger paleovalleys/paleochannels calcrete-hosted U Lake Waukarlycarly, east & west of Telfer, Lake Winfred
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