Copper-gold mineral systems in the southeastern Gawler Craton -
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1 Copper-gold mineral systems in the southeastern Gawler Craton - another Mt Isa Eastern Succession? Ollie Raymond 1, Ian Fletcher 2 and Neal McNaughton 2 1 Geoscience Australia, Canberra, ACT, Centre of Excellence in Mass Spectrometry, Curtin University of Technology, Perth, WA, 6845
2 PEAKE AND DENISON DOMAIN NAWA DOMAIN COOBER PEDY RIDGE REWORKED MARGIN CHRISTIE DOMAIN FOWL ER DOMAIN NUYTS DOMAIN MT WOODS DOMAIN UNDIFFERENTIATED GAWLER RANGE VOLCANICS DOMAIN OLYMPIC DOMAIN HARRIS GREENSTONE BELT R EWORK ED MARGIN CL EVE DOMAIN S P ENC ER DOMAIN COULTA DOMAIN SOUTHE RN OCEAN Tectonic elements of the Gawler Craton (Ferris et al, 2002) GAWLER CRATON WILGENA DOMAIN MOONTA SUBDOMAIN Adelaide kilometres
3 1400 Ma biot. biot. Ar-Ar K-Ar musc. K-Ar MOONTA SUBDOMAIN MT ISA EASTERN SUCCESSION 1500 Ma 1575 Ma 1600 Ma WARTAKAN EVENT Moonta Wallaroo MOONTA EVENT (KARARAN, TICKERA, HILTABA) Hiltaba Suite (SHRIMP U/Pb ages) Williams Batholith ISAN OROGENY Cloncurry Belt Cu-Au 1700 Ma 1735 Ma 1765 Ma 1800 Ma KIMBAN OROGENY Wallaroo Group (SHRIMP U/Pb ages) Soldiers Cap Group WONGA EVENT Corella Fm Argylla Fm
4 m Wallaroo Moonta Moonta Subdomain (Yorke Peninsula) Depth to Palaeo- - and Meso-proterozoic basement 50m contour very little outcrop basement interpretation through geophysics and drilling km
5 The drillhole coverage initially looks impressive But remove the drillholes which do not intersect basement and holes with only very short basement tails
6 and there is a lot of the Yorke Peninsula basement that has not been adequately tested
7 Pine Point Fault Alford Alford Fault Fault Zone Zone Warooka Fault Zone Warooka Fault Zone Gawler Craton Structure Total Magnetic Intensity (NE sunangle) km
8 Pine Point Fault Alford Alford Fault Fault Zone Zone Warooka Fault Zone Warooka Fault Zone Gawler Craton Structure Total Magnetic Intensity (NE sunangle) km
9 Gawler Craton Hiltaba Suite intrusives Wallaroo Group metasediments Lithologies Total Magnetic Intensity (NE sunangle) and volcanics km
10 Gawler Craton Magnetic alteration Total Magnetic Intensity (NE sunangle) km
11 Northern Yorke Peninsula Basement Geology Regions of magnetic alteration Hiltaba Suite Mixed Hiltaba Suite and Wallaroo Group Wallaroo Group Pre-Wallaroo Group basement km
12 Moonta Subdomain Wallaroo Group Mt Isa Eastern Succession Corella Corella Fm,, Soldiers Cap Group mixed siliclastic, feldspathic,, carbonate greenschist to amphibolite grade and?evaporitic? metasediments metamorphic and metasomatic felsic and mafic metavolcanics scapolite
13 Hiltaba Suite Williams Suite Mesoproterozoic,, oxidised, I-type magmatism variably fractionated, felsic and mafic plutons close spatial and temporal relationships with alteration
14 Regional alteration assemblages in the Moonta Subdomain Albite - calcsilicate - magnetite Biotite - magnetite - albite
15 Regional albite - calcsilicate - magnetite alteration calcsilicates typically actinolite and/or clinopyroxene albite-, magnetite-, and actinolite-dominant variants ± accessory epidote, calcite, titanite, allanite (REE epidote), tourmaline veins and massive replacement unfoliated to strongly foliated breccias and pseudobreccias typically proximal to granites
16 Albite - calcsilicate - magnetite alteration geophysical signature Tickera Granite km
17 Mt Isa Eastern Succession Broad association of Na-Ca- -Ca-Fe metasomatism with Cu-Au mineralisation Which outcrop is in the regional alteration zone around Ernest Henry? North Beach, near Wallaroo, Moonta Subdomain Mt Fort Constantine, Cloncurry Belt
18 Biotite - magnetite - albite alteration ± quartz, apatite, monazite, tourmaline, amphibole, pyrite, chalcopyrite commonly foliation-controlled biotite-magnetite alteration domains distal albitic haloes strongly foliated biotite-magnetite schists vein stockworks in weakly foliated rocks massive biotite-magnetite ironstones at contacts of granites
19 Biotite - magnetite - albite alteration veins and narrow foliation-parallel domains low grade copper mineralisation
20 Biotite - magnetite - albite alteration geophysical signature km
21 Cu mineralisation associated with biotite-magnetite in the Wallaroo district low grade chalcopyrite- pyrite in a sheared host analogy to some Cloncurry Belt Fe-Cu-Au deposits Biotite alteration in the Mt Isa Eastern Succession magnetite-biotite ironstones potassic alteration commonly proximal to Fe oxide-cu-au deposits e.g. Ernest Henry
22 Regional alteration geochronology (SHRIMP U/Pb preliminary results) monazite from biotite-rich alteration titanite from albite-magnetite alteration
23 1400 Ma biot. biot. Ar-Ar K-Ar musc. K-Ar hbl. K-Ar 1500 Ma WARTAKAN EVENT Regional alteration geochronology 1575 Ma 1600 Ma Hiltaba Suite titanite (SHRIMP U/Pb Pb) monazite (SHRIMP U/Pb Pb) monazite (SHRIMP U/Pb Pb) (preliminary results) ~1625 Ma evidence of a broader hydrothermal system? 1700 Ma KIMBAN OROGENY 1735 Ma 1765 Ma Wallaroo Group 1800 Ma
24 Non-magnetic alteration overprints Chlorite - quartz - hematite - kfeldspar - pyrite - chalcopyrite Epithermal style kaolinite, quartz and carbonate Relatively minor regional alteration styles in the Moonta Subdomain - but locally host significant Cu mineralisation (eg: some Moonta veins) - under-represented in drilling due to targeting of magnetic highs? Paragenetic link to other higher crustal level, oxidised mineral systems in the Olympic Domain - Olympic Dam - Prominent Hill
25 Chlorite - quartz ± hematite ± kfeldspar ± pyrite ± chalcopyrite biotite, actinolite chlorite albite chlorite, kfeldspar magnetite hematite Overprint on albite-actinolite-magnetite alteration
26 Chlorite - quartz - hematite - chalcopyrite Local demagnetisation along faults of earlier magnetic alteration km
27 Epithermal style alteration Kaolinite ± quartz, pyrite, alunite, chalcocite Tickera Granite kaolinite alteration zone Alford Fault Zone Wallaroo mines Moonta mines km
28 Quartz - carbonate ± hematite ± adularia ± pyrite, chalcopyrite, bornite local veining and brecciation
29 Significance of epithermal alteration styles The timing of epithermal alteration is poorly constrained important implications for unroofing of the terrane Mesoproterozoic telescoping of the hydrothermal system? or a much younger system (e.g. Delamarian) )?
30 In conclusion.
31 Moonta Subdomain and Mt Isa Eastern Succession The Similarities Palaeoproterozoic mixed carbonate / siliciclastic metasedimentary and metavolcanic basement Mesoproterozoic felsic and mafic intrusive suite Syn-magmatic deformation and metamorphism; greenschist to amphibolite Regionally extensive Na-Ca-K- -Ca-K-Fe metasomatism associated with magmatism Regionally extensive fault zones as potential fluid conduits Fe and K metasomatism associated with Cu mineralisation Abundant Cu-Au anomalism
32 Moonta Subdomain and Mt Isa Eastern Succession The Differences Palaeoproterozoic phase of metasomatism in the Eastern Succession Chlorite-quartz-hematite hematite-kfeldspar-chalcopyrite and epithermal styles of alteration in the Moonta Subdomain the Olympic Dam link? Large tonnage Fe oxide-cu-au deposits discovered in the Eastern Succession A lack of Palaeo- - and Mesoproterozoic outcrop in the Moonta Subdomain
33 Moonta - Wallaroo Cloncurry Belt?? Olympic Dam Prominent Hill
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