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203702: Metadacite, Golden Grove Mine (Scuddles Member, Gossan Hill Formation, Murchison Supergroup, Murchison Domain, Youanmi Terrane, Yilgarn Craton)

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203702: Metadacite, Golden Grove Mine (Scuddles Member, Gossan Hill Formation, Murchison Supergroup, Murchison Domain, Youanmi Terrane, Yilgarn Craton) 203702.1.pdf Geochronology Record 1259 203702: metadacite, Golden Grove mine (Scuddles Member, Gossan Hill Formation, Murchison Supergroup, Murchison Domain, Youanmi Terrane, Yilgarn Craton) Location and sampling Petrographic description Yalgoo (SG 50-2), Badja (2240) The sample is a porphyritic metadacite, consisting MGA Zone 50, 496097E 6816582N of about 65–70% aphanitic matrix, 20% plagioclase, 10% actinolite, and accessory chlorite, epidote, and Sampled on 18 December 2012 iron–titanium oxide minerals. The matrix is crypto- to microcrystalline (grain size up to 0.05 mm), and composed This sample was collected from the 804.40 – 808.77 m mainly of sericite, quartz, and feldspar. Plagioclase depth interval of diamond drillhole G12/501, at MMG’s (andesine, An30–34) forms subhedral to euhedral lath- Golden Grove copper–lead–zinc mine, located about shaped phenocrysts, up to 0.8 mm long, that are clouded 230 km east of Geraldton and 56 km southeast of Yalgoo. by saussurite and rimmed by albite. Actinolite occurs as The drillhole is located on the west side of a track, about sheaves of acicular, microcrystalline to fine-grained (up 4.1 km northeast of Minjar Well, 2.4 km north-northeast to 0.1 mm long) crystals. Minor resorption of plagioclase of Minjar Hill, and 2.2 km southwest of the southeast end phenocrysts suggests they were entrained in the magma of Golden Grove airstrip. prior to crystallization of the melt. Tectonic unit/relations Zircon morphology The unit sampled is a metadacite assigned to the Zircons isolated from this sample are colourless and Scuddles Member of the Gossan Hill Formation of the subhedral to euhedral. The crystals are up to 250 µm long, Murchison Supergroup (Van Kranendonk et al., 2013). The and equant to elongate, with aspect ratios up to 5:1. In 3000– 2700 Ma Murchison Supergroup consists mainly cathodoluminescence (CL) images, concentric zoning is of metabasalt, felsic metavolcanic and metavolcaniclastic ubiquitous, and many crystals exhibit sector zoning. A CL image of representative zircons is shown in Figure 1. rocks, and clastic and chemical metasedimentary rocks (Van Kranendonk et al., 2013). The 2963–2947 Ma Gossan Hill Formation consists of rhyolitic to dacitic Analytical details metavolcanic and metavolcaniclastic rocks, locally hosting economic massive sulfide mineralization (e.g. Sharpe This sample was analysed on 31 May – 1 June 2013, using and Gemmell, 2001). The Scuddles Member consists of SHRIMP-B, and 10–11 June 2013, using SHRIMP-A. porphyritic metadacite with lesser rhyodacite and felsic Analyses 1.1 to 17.1 (spot numbers 1–17) were obtained volcaniclastic rocks, and overlies felsic metavolcanic during the first session, together with 11 analyses of the rocks of the Golden Grove and Gossan Valley Members BR266 standard, of which eight analyses indicated an of the Gossan Hill Formation. Volcanic rocks of the external spot-to-spot (reproducibility) uncertainty of 0.55% (1σ) and a 238U/206Pb* calibration uncertainty of Gossan Hill Formation were coeval with metatonalite and 207 206 metagranodiorite of the 2964–2945 Ma Bunnawarra Suite, 0.26% (1σ). Isotopic mass fractionation of Pb/ Pb which consists of deformed rafts within plutons of the ratios during the first session was corrected by reference to the OGC1 standard; measured ratios were increased c. 2750 Ma Rothsay Suite of the 2820–2735 Ma Annean by 0.71%. Analyses 18.1 to 35.1 (spot numbers 18–35) Supersuite (Van Kranendonk et al., 2013; Chen et al., in were obtained during the second session, together with prep.). The Gnows Nest Granodiorite of the Thundelarra 12 analyses of the BR266 standard, which indicated an Supersuite intrudes the base of the Gossan Hill Formation external spot-to-spot (reproducibility) uncertainty of and may be subvolcanic to the Scuddles Member (Chen 0.50% (1σ) and a 238U/206Pb* calibration uncertainty of et al., in prep.). Metarhyolite of the underlying Golden 0.20% (1σ). Isotopic mass fractionation of 207Pb/206Pb Grove Member, sampled at approximately 596–600 m ratios during the second session was corrected by depth in drillhole G12/501, yielded a crystallization age reference to the OGC1 standard; measured ratios were of 2963 ± 6 Ma (GSWA 203703, Wingate et al., 2015a). increased by 0.24%. Calibration uncertainties are included A metarhyolite of the Gossan Valley Member, sampled at in the errors of 238U/206Pb* ratios and dates listed in approximately 8–10 m depth in drillhole G12/501, yielded Table 1. Common-Pb corrections were applied to all a crystallization age of 2959 ± 5 Ma (GSWA 203704, analyses using contemporaneous isotopic compositions Wingate et al., 2015b). determined according to the model of Stacey and Kramers (1975). 1 203702.1.pdf Geochronology Record 1259 Figure 1. Cathodoluminescence image of representative zircons from sample 203702: metadacite, Golden Grove mine. Numbered circles indicate the approximate positions of analysis sites. 0.24 203702 3100 35 analyses of 35 zircons 0.23 3050 * Pb 0.22 206 Pb*/ 207 0.21 2900 2850 0.20 2800 0.19 1.31.4 1.51.6 1.71.8 1.92.0 2.1 238U/206Pb* Figure 2. U–Pb analytical data for sample 203702: metadacite, Golden Grove mine. Yellow squares indicate Group I (magmatic zircons). 2 203702.1.pdf Geochronology Record 1259 Table 1. Ion microprobe analytical results for zircons from sample 203702: metadacite, Golden Grove mine Group Spot Grain. 238U 232Th 232Th ƒ204 238U/206Pb 207Pb/206Pb 238U/206Pb* 207Pb*/206Pb* 238U/206Pb* 207Pb*/206Pb* Disc. ID no. spot (ppm) (ppm) 238U (%) ± 1σ ± 1σ ± 1σ ± 1σ date (Ma) ±1σ date (Ma) ±1σ (%) I 11 11. 1 110 131 1.24 0.029 1.717 0.024 0.21448 0.00125 1.718 0.024 0.21422 0.00126 2958 33 2938 10 -0.7 I 28 28.1 157 157 1.04 0.083 1.649 0.017 0.21556 0.00135 1.650 0.017 0.21483 0.00137 3054 25 2942 10 -3.8 I 33 33.1 229 246 1. 11 0.006 1.590 0.015 0.21566 0.00123 1.590 0.015 0.21561 0.00123 3146 23 2948 9 -6.7 I 18 18.1 123 115 0.97 0.021 1.692 0.019 0.21581 0.00139 1.692 0.019 0.21563 0.00140 2994 26 2948 10 -1.5 I 29 29.1 168 136 0.84 -0.023 1.799 0.019 0.21547 0.00143 1.799 0.019 0.21567 0.00144 2850 25 2949 11 3.4 I 3 3.1 312 396 1.31 0.045 1.758 0.017 0.21623 0.00082 1.759 0.017 0.21583 0.00083 2902 23 2950 6 1. 6 I 13 13.1 107 101 0.98 0.031 1.747 0.024 0.21634 0.00129 1.748 0.024 0.21606 0.00130 2917 33 2952 10 1. 2 I 32 32.1 167 182 1. 12 0.010 1.690 0.018 0.21630 0.00136 1.690 0.018 0.21621 0.00136 2996 26 2953 10 -1.5 I 19 19.1 55 49 0.90 0.000 1.590 0.025 0.21632 0.00177 1.590 0.025 0.21632 0.00177 3145 39 2954 13 -6.5 I 20 20.1 43 24 0.58 0.000 1.667 0.028 0.21661 0.00195 1.667 0.028 0.21661 0.00195 3030 42 2956 15 -2.5 I 12 12.1 63 32 0.54 -0.026 1.761 0.030 0.21638 0.00162 1.760 0.030 0.21661 0.00163 2900 41 2956 12 1. 9 I 6 6.1 132 96 0.75 0.020 1.676 0.020 0.21687 0.00108 1.676 0.020 0.21669 0.00108 3016 29 2956 8 -2.0 I 35 35.1 128 109 0.88 0.043 1.635 0.065 0.21725 0.00140 1.636 0.065 0.21686 0.00141 3076 101 2958 11 -4.0 I 17 1 7. 1 105 59 0.58 0.016 1.785 0.025 0.21720 0.00129 1.785 0.025 0.21706 0.00130 2868 33 2959 10 3.1 I 31 31.1 137 186 1.40 -0.021 1.660 0.018 0.21690 0.00140 1.660 0.018 0.21708 0.00141 3040 27 2959 10 -2.7 I 10 10.1 111 132 1.23 0.044 1.763 0.025 0.21749 0.00125 1.763 0.025 0.21709 0.00128 2896 33 2959 9 2.1 3 I 5 5.1 219 214 1. 01 0.017 1.710 0.017 0.21736 0.00085 1.711 0.017 0.21721 0.00086 2967 24 2960 6 -0.2 I 21 21.1 115 66 0.59 0.000 1.671 0.020 0.21732 0.00152 1.671 0.020 0.21732 0.00152 3024 29 2961 11 -2.1 I 23 23.1 122 71 0.60 -0.023 1.642 0.018 0.21747 0.00143 1.641 0.018 0.21767 0.00144 3067 27 2964 11 -3.5 I 24 24.1 91 83 0.94 -0.058 1.669 0.022 0.21740 0.00168 1.668 0.022 0.21791 0.00170 3027 32 2965 13 -2.1 I 7 7. 1 111 70 0.66 -0.013 1.705 0.022 0.21788 0.00119 1.705 0.022 0.21799 0.00120 2975 31 2966 9 -0.3 I 14 14.1 96 111 1. 19 0.174 1.747 0.025 0.21960 0.00868 1.750 0.025 0.21804 0.00871 2914 35 2966 64 1.
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