AUSTRALIAN ARCHEAN MAFIC-ULTRAMAFIC MAGMATIC EVENTS Sheet 1 of 2 Broome 114° 120° 126° 132° 138° 120° 130° 140° 150° 120° Sheet 1: Map of Australian Archean Mafic-Ultramafic Magmatic Events, Archean Mafic-Ultramafic Magmatic Events 18° 10° Time–Space–Event Chart 10° Sheet 2: Maps of Interpreted Distribution, Characterisation, and Nickel Archean Magmatic Events (AME) are defined from the published ages of mafic and AME 17 Resources of Archean Mafic-Ultramafic Rocks in the ultramafic rocks in each province and their temporal and spatial relationships are A AME 6 Port Hedland Yilgarn Craton summarised in the 'Time–Space–Event' Chart. Time-equivalent magmatism in different AME 6 a e an provinces does not necessarily imply cogenetic magmatism. The informal event names are rr Undefined AME 3 B Te AME 3 West Pilbara Mount Isa Locations of additional ages and other geological data e ra C taken from dated examples n AME 2 ba a C Terrane NORTHERNil TERRITORY r P East Pilbara (arranged on 1:5 000 000 map from north to south) r Dampier AME 13 AME 8 l AME 2 AME 17 AME 6 e D AME 6 a D T tr Terrane AME 16 Bradley Event AME 6 (mu): ~3115 Ma; a Port Hedland Undefined en A ra AME 16 C PILBARA a Dominantly mafic-ultramafic rock units are shown with bold colours a AME 4 b Undefined AME 4 3117 ± 3 Ma (SHRIMP U-Pb zircon) tuff interbedded with basalt of Woodbrook Formation, ilb CRATON AME 6 AME 16 AME 6 AME 6 West Pilbara P East Pilbara F Woodbrook Homestead, Pilbara Craton b Terrane AME 8 F Terrane B al PILBARA ntr AME 13 HAMERSLEY 20° Subordinate mafic-ultramafic rocks of the same age within a regional rock package are e Undefined AME 5 Undefined 20° Dampier C G BASIN Bradley Event AME 6 (mu): ~3115 Ma; shown with pale colours AME 16 AME 5 d AME 13 AME 13 b AME 18 AME 5 d (1) 3125 ± 4 Ma (SHRIMP U-Pb zircon) felsic tuff from top of Nallana Formation that underlies AME 13 G the Bradley Basalt, Mount Sholl, and (2) 3116 ± 3 Ma (SHRIMP U-Pb zircon) rhyodacite E PILBARA AME 16 AME 8 Undefined Note that the presence of mafic and ultramafic rocks in some areas is interpreted only from AME 16 Mosquito Creek Basin AME 16 AME 18 interbedded with metabasalt of Bradley Basalt, Mount Fisher, Pilbara Craton CRATON AME 13 geophysical data. Further occurrences of these rocks may exist under cover AME 18 AME 13 CRATON Munni Munni Event AME 8 (mu): ~2925 Ma; Undefined c AME 16 c c Pannawonica (1) 2927 ± 13 Ma (Sm-Nd mineral isochron) PGE-bearing porphyritic websterite; (2) 2925 ± 2 Ma AME 8 Undefined AME 18 AME 16 f In the period ~2820 Ma to ~2660 Ma there is an apparent ~160 Ma continuum of Archean e Kurrana Terrane AME 8 E AME 8 (SHRIMP U-Pb zircon-baddeleyite) pegmatitic gabbro; and (3) 2924 ± 5 Ma (SHRIMP U-Pb zircon) HAMERSLEY AME 13 AME 18 monzonite dyke cutting Munni Munni Intrusion, Pilbara Craton magmatic ages which may not be accurately resolved into distinct magmatic episodes by AME 13 g Exmouth AME 18 H f AME 16 AME 13 Undefined AME 18 e YILGARN available geochronology. 'Magmatic Events' are named at 10 Ma intervals within this period AME 18 AME 18 GAWLER AME 16 AME 18 CRATON Honeyeater Event AME 5 (mu): ~3175 Ma; AME 18 BASIN I CRATON 30° d Alice Springs 30° 3182 ± 2 Ma (SHRIMP U-Pb zircon) unnamed subvolcanic sill of Dalton Suite that intrudes Undefined AME 15 Soanesville Group sedimentary rocks, Sulphur Springs, Pilbara Craton Dominant Subordinate Undefined AME 16 HAMERSLEY Mosquito Creek Basin 24° Paraburdoo AME 13 SYLVANIA AME 13 AME 18 KurranaTerrane Maddina Event AME 18 (m): ~2715 Ma; INLIER e g H 2717 ± 2 Ma dacite interlayered with basalt and shoshonitic rocks of Maddina Formation, AME 26 (mu): ~2520 Ma (Lake Harris Event) Booloomba Pool, Hamersley Basin J Undefined Undefined AME 13 AME 15 AME 16 I AME 18 f Kathleen Valley Event AME 16 (mu): ~2735 Ma; AME 25 (mu): ~2560 Ma (Devils Playground Event) AME 18 Yulara 2741 ± 3 Ma (SHRIMP U-Pb zircon) tuff directly underlying and chemically related to INSET AME 13 AME 16 BASIN overlying basalt of Kylena Basalt, Nullagine, Hamersley Basin Most Archean mafic and ultramafic rocks in the Yilgarn Craton are AME 24 (m): ~2625 Ma (Kaluweerie Event) 24° W E S T E R N A U S T R A L I A Black Range Event AME 13 (m): ~2770 Ma; not assigned to an Archean Magmatic Event because the solid- 40° g geology coverage is not assigned with stratigraphic Formation or 40° 2775 ± 10 Ma (SHRIMP U-Pb zircon) felsic volcanic rock near base of Mount Roe Basalt, Member information. In the Pilbara Craton and Hamersley Basin the Wyloo Dome, Hamersley Basin mafic and ultramafic rocks have generally been formally Undefined AME 23 (m): ~2665 Ma (Coates Siding Event) Undefined Carnarvon e stratigraphically characterised and can in some cases be assigned to AME 13 W E S T E R N A U S T R A L I A n Washburton AME 18 AME 18 a AME 11 Magmatic Events Paraburdoo Narndee Event AME 11 (mu): ~2800 Ma; rr h h e Generalised Geology of Australia 2799 ± 2 Ma (SHRIMP U-Pb zircon) volcaniclastic unit conformably underlying komatiite, Lordy Bore, AME 22 (m): ~2675 Ma (Golden Mile Event) T AME 12 AME 9 Meekatharra, Yilgarn Craton. Greenstones in the Meekatharra to Cue area of the Murchison Domain range r 110° 120° 130° 140° 150° 160° in age from ~2820 Ma to ~2720 Ma and have been divided into three groups by GSWA, each containing e L M AME 7 y Scale 1:2 500 000 SYLVANIA INLIER basaltic and komatiitic basaltic rocks. To the south and southwest, at Yalgoo and at Mount Gibson, mafic to AME 21 (mu): ~2685 Ma (Mount Pleasant Event) rr Undefined Wiluna N 0 50 100 150 200 250 Kilometres Geological ages (in million years: Ma) AME 1 a AME 14 SOUTH AUSTRALIA ultramafic volcanic rocks are overlain by felsic volcanic rocks, and/or intruded by granitic rocks in N Meekatharra AME 14 K AME 16 j Oodnadatta the range 2935 Ma to 2919 Ma, and are thus older than these ages AME 14 P Geographic Projection. Geocentric Datum of Australia 1994 AME 15 Cenozoic Paleozoic Archean AME 20 (mu): ~2695 Ma (Williamstown Event) AME 11 O J (0 to 65 Ma) (251 Ma to 542 Ma) (2500 Ma to 4000 Ma) i 24° 24° i Mount Warren Event AME 14 (mu): ~2755 Ma; Mesozoic Proterozoic 2761 ± 1 Ma (TIMS U-Pb zircon) rhyolitic tuff associated with high-Mg basalt and INSET (65 Ma to 251 Ma) (542 Ma to 2500 Ma) AME 19 (mu): ~2705 Ma (Kambalda Event) Cue komatiite, Emily Well, Cue, Yilgarn Craton AME 15 WESTERN AUSTRALIA YILGARN S 120° k o Mount Warren Event AME 14 (mu): ~2755 Ma; K AME 19 u j AME 11 al AME 18 (m): ~2715 Ma (Maddina Event) AME 18 t 2755 ± 5 Ma (SHRIMP U-Pb zircon) hornblende plagiogranite interpreted to be fractionate of AME 18 h m S O U T H A U S T R A L I A g e B R Coober Pedy layered gabbro intrusion, Hootanui Well, Duketon, Yilgarn Craton o u Mount Magnet r l M Laverton r AME 10 n Q o tv Domain Undifferentiated i edy u AME 24 r l P C l ber NORTHERN TERRITORY AME 17 (m): ~2725 Ma (Gidley Event) l oo Sylvania Event AME 15 (m): ~2745 Ma; r i e C Domain k Y e r c o o Mount Woods 2745 ± 4 Ma (TIMS U-Pb zircon) felsic tuff associated with high-Mg basalt and komatiite, h u T T e s Leonora i a rr Domain s n e a Only those geological provinces containing Archean Dalgaranga Homestead, Yilgarn Craton m s n Undefined 120° 130° Undefined o r e n i mafic and ultramafic rocks are labelled ai r AME 16 (mu): ~2735 Ma (Kathleen Valley Event) D om n Ter an ie D ra o K st Undefined ne Undefined ri Maddina Event AME 18 (m): ~2715 Ma; m e h l u C AME 11 r 30° 2719 ± 6 Ma (SHRIMP U-Pb zircon) granophyric unit of Dalgaranga Gabbro, a AME 23 n 20° Geraldton in 3 AME 15 (m): ~2745 Ma (Sylvania Event) S i a a n l AME 21 m Dalgaranga Homestead, Yilgarn Craton U o p o 2 i D 1 D AME 21 T n a T 2 en AME 26 o e g AME 25 20° Kambalda Event AME 19 (mu): ~2705 Ma or Williamstown Event AME 20 (mu): ~2695 Ma; r il m AME 14 (mu): ~2755 Ma (Mount Warren Event) m r AME 21 Undefined AME 19 a W Olympic 4 2698 ± 5 Ma (SHRIMP U-Pb zircon) volcaniclastic dacite interlayered with komatiite, a n q in i e a Domain Murrin Murrin, Yilgarn Craton n p m Kalgoorlie AME 19 Rawlinna o D Harris Greenstone AME 13 (m): ~2770 Ma (Black Range Event) AME 19 r AME 26 6 t le 5 Mount Pleasant Event AME 21 (mu): ~2685 Ma; r w Domain Y n W o CRATON 2684 ± 3 Ma (SHRIMP U-Pb zircon) felsic volcanic rock intercalated with tholeiitic basalt, V F GAWLER Kambalda AME 19 7 Jump Up Dam, Lake Rebecca, Yilgarn Craton 30° AME 22 Nuyts AME 12 (m): ~2790 Ma (Little Gap Event) Undefined Eucla s Domain WESTERN AUSTRALIA Undefined AME 20 X AME 22 Ceduna 8 o Coates Siding Event AME 23 (m): ~2665 Ma; 2661 ± 3 Ma (SHRIMP U-Pb zircon) Mount Vetters granophyric dolerite, AME 11 (mu): ~2800 Ma (Narndee Event) u AME 18 Mount Vetters Homestead, Yilgarn Craton 8 SOUTH AUSTRALIA AME 23 v AME 10 (m): ~2810 Ma (Mount Sefton Event) Z Undefined p Kambalda Event AME 19 (mu): ~2705 Ma; n i 13 2706 ± 5 Ma, and 2704 ± 4 Ma (SHRIMP U-Pb zircon) rhyolitic rocks intercalated with S a Undefined komatiite of Kambalda Komatiite, Black Swan nickel mine, Yilgarn Craton PERTH o w m 17 u o n AME 9 (mu): ~2820 Ma (Lady Alma Event) i 10 10 13 20 t D a 12 h 22 CRATON a Mount Pleasant Event AME 21 (mu): ~2685 Ma; t m 14 30° q AME 18 W l o 11 u 16 2683 ± 3 Ma (SHRIMP U-Pb zircon) felsic tuff associated with basalt, Reidy Swamp, x e o D AME 8 (mu): ~2925 Ma (Munni Munni Event) s C e 23 Kanowna, Yilgarn Craton t v 15 e 19 T Undefined l e Ravensthorpe 30° rra z C 18 Kambalda Event AME 19 (mu): ~2705 Ma; n AME 26 r AME 7 (m): ~2960 Ma (Lake Wells Event) e 2708 ± 7 Ma (SHRIMP U-Pb zircon) dacite coeval with komatiite, Ballarat-Last Chance Bunbury y AME 11 Esperance mine, Kalgoorlie, Yilgarn Craton Undefined Scale 1:5 000 000 9 24 21 AME 6 (mu): ~3115 Ma (Bradley Event) 0 100 200 300 400 500 600 Kilometres 23 s Golden Mile Event AME 22 (m): ~2675 Ma; ADELAIDE 2675 ± 3 Ma (SHRIMP U-Pb zircon) felsic volcanic breccia associated with basalt of Black Flag Beds, Harry Dam, Perkolilli, Kanowna, Yilgarn Craton AME 5 (mu): ~3175 Ma (Honeyeater Event) Lambert Conformal Conic Projection.