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181105: Quartz Sandstone, Rainbow Valley (Tumblagooda Sandstone, Southern Carnarvon Basin)

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181105: Quartz Sandstone, Rainbow Valley (Tumblagooda Sandstone, Southern Carnarvon Basin) 181105.1.pdf Geochronology Record 1266 181105: quartz sandstone, Rainbow Valley (Tumblagooda Sandstone, Southern Carnarvon Basin) Location and sampling Zircon morphology Ajana (SG 50-13), Kalbarri (1742) Zircons isolated from this sample are mainly colourless, MGA Zone 50, 217735E 6926406N anhedral to subhedral, and strongly rounded. The crystals are up to 400 μm long, and equant to elongate, with aspect Sampled on 25 September 2003 ratios up to 4:1. Some crystals have pitted outer surfaces and, in cathodoluminescence (CL) images, most exhibit This sample was collected from a cliff adjacent to a concentric zoning truncated at grain edges, features walking trail at Rainbow Valley, about 11.0 km north- consistent with abrasion during sedimentary transport. A northeast of Bluff Point, 6.8 km southwest of Kalbarri CL image of representative zircons is shown in Figure 1. town site, and 1.3 km south of Red Bluff. The sample comes from close to 36 m in the section measured there by Evans et al. (2007, Fig. 6). Analytical details This sample was analysed on 21–22 October 2005 Tectonic unit/relations and 24–25 October 2005, using SHRIMP-A. Analyses 1.1 to 21.1 (spot numbers 1–23) were obtained during The unit sampled is a cross-bedded quartz sandstone the first session, together with 12 analyses of the of the Tumblagooda Sandstone (Hocking, 1991). The CZ3 standard. Significant drift of standard 238U/206Pb* formation consists mainly of fine-grained sandstone, minor dates during the session was addressed by fitting a coarse-grained and pebbly sandstone, and rare siltstone LOWESS curve (Cleveland, 1979) with a smoothing grading into very fine grained sandstone. An Ordovician – window of six analyses, implemented using the program earliest Silurian age (c. 485 to 420 Ma) is inferred for the Squid 2.50 (Ludwig, 2009; Wingate and Kirkland, formation based on Early Silurian conodont faunas in the 2015). The analyses indicated an external spot-to-spot overlying Ajana Formation (Mory et al., 1998). (reproducibility) uncertainty of 0.50% (1σ), which is included in the errors of 238U/206Pb* ratios and dates listed in Table 1. Analyses 22.1 to 44.3 (spot numbers Petrographic description 24–60) were obtained during the second session, together The sample is a medium- to coarse-grained quartz with 27 analyses of the CZ3 standard, which indicated sandstone, consisting of about 80–90% quartz, 10% illite an external spot-to-spot (reproducibility) uncertainty 238 206 or sericite, 3–5% K-feldspar, 3–5% lithic clasts, and of 1.51% (1σ) and a U/ Pb* calibration uncertainty minor zircon, tourmaline, altered biotite, and limonite. of 0.32% (1σ). Calibration uncertainties are included 238 206 Quartz is bimodal in size, with about 30% of the rock in the errors of U/ Pb* ratios and dates listed in occupied by rounded grains from 0.8 to 1.6 mm (coarse Table 1. Common-Pb corrections were applied to all to very coarse sand), commonly with narrow optically analyses using contemporaneous isotopic compositions continuous overgrowths, and more abundant grains from determined according to the model of Stacey and Kramers 0.1 to 0.5 mm in diameter (fine to medium sand), possibly (1975). Dates from analyses for which 204-corrected with optically continuous overgrowths and defining a 238U/206Pb* ratios indicate ages <1000 Ma are based on mosaic texture. Most of the coarser sand is composed of 207-corrected 238U/206Pb* ratios; those >1000 Ma are based single-crystal quartz grains with minor microcline and on 204-corrected 207Pb*/206Pb* ratios. rare polycrystalline quartz as well as rare clasts of very fine grained sandstone containing quartz, microcline, and possible illite–kaolinite aggregates. The fine to medium Results sand is more quartz-rich. Interstitial porous decussate illite Sixty analyses were obtained from 55 zircons. Results are or sericite is common, and there are disseminated voids, listed in Table 1, and shown in concordia diagrams (Figs 2 including crystal-lined cavities where there are euhedral and 3), and a probability density diagram (Fig. 4). optically continuous overgrowths on larger grains. Zircon, up to 0.1 mm long, occurs as inclusions in quartz, partly in optically continuous overgrowths, with tourmaline Interpretation also in optically continuous overgrowths. Altered biotite and patches of limonite-stained colloform clay are The analyses are concordant to strongly discordant (Figs 2 disseminated in the rock. and 3). Ten analyses >1000 Ma are >5% discordant, and 1 181105.1.pdf Geochronology Record 1266 Figure 1. Cathodoluminescence image of representative zircons from sample 181105: quartz sandstone, Rainbow Valley. Numbered circles indicate the approximate locations of analysis sites. 0.24 3000 181105 60 analyses of 55 zircons 0.20 0.16 2500 * Pb 206 2000 Pb*/ 0.12 207 1500 0.08 700 400 300 0.04 0.00 0510 15 20 25 238 206 U/ Pb* Figure 2. U–Pb analytical data for sample 181105: quartz sandstone, Rainbow Valley. Blue square indicates Group Y (youngest detrital zircon); red squares indicate Group S (older detrital zircons); crossed squares indicate Group D (discordance >5% or high common Pb). 2 181105.1.pdf Geochronology Record 1266 Table 1. Ion microprobe analytical results for zircons from sample 181105: quartz sandstone, Rainbow Valley 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 (%) Y 57 54.1 189 203 1. 11 0.274 13.223 0.313 0.05910 0.00132 13.259 0.315 0.05688 0.00206 469 11 487 80 3.7 S 8 8.1 374 358 0.99 0.234 12.890 0.098 0.05817 0.00089 12.921 0.099 0.05628 0.00118 481 4 463 46 -3.7 S 4 9.1 100 239 2.47 1.152 12.607 0.157 0.05947 0.00145 12.754 0.168 0.05026 0.00381 487 6 207 176 -134.8 S 56 53.1 145 141 1. 01 1.224 12.479 0.301 0.06030 0.00139 12.634 0.310 0.05051 0.00378 491 12 219 173 -124.6 S 50 48.1 259 98 0.39 0.525 12.468 0.286 0.05835 0.00104 12.534 0.289 0.05411 0.00203 495 11 376 84 -31.7 S 18 18.1 73 148 2.09 -0.665 12.307 0.178 0.06108 0.00175 12.226 0.183 0.06659 0.00361 507 7 825 113 38.6 S 31 29.1 170 246 1.50 1.066 12.301 0.296 0.06095 0.00141 12.434 0.303 0.05238 0.00357 499 12 302 155 -65.0 S 59 55.1 390 302 0.80 0.418 12.270 0.275 0.05902 0.00081 12.322 0.276 0.05563 0.00145 503 11 438 58 -14.9 S 55 52.1 229 234 1.06 0.477 12.036 0.279 0.06256 0.00141 12.094 0.281 0.05867 0.00225 512 12 555 84 7. 7 S 15 15.1 222 478 2.23 0.074 12.071 0.112 0.05924 0.00098 12.080 0.113 0.05864 0.00115 513 5 554 43 7. 4 S 10 5.1 77 83 1. 12 0.916 12.042 0.157 0.06085 0.00681 12.153 0.166 0.05347 0.00764 510 7 349 323 -46.2 S 9 4.1 171 180 1.09 1.185 11.874 0.115 0.06108 0.00105 12.016 0.123 0.05158 0.00278 515 5 267 124 -93.2 3 S 54 51.2 116 84 0.75 1.743 11.828 0.293 0.06337 0.00892 12.038 0.306 0.04947 0.01012 514 13 170 478 -202.2 S 30 28.1 268 241 0.93 0.649 11.774 0.271 0.06008 0.00102 11.851 0.274 0.05483 0.00213 522 12 405 87 -28.8 S 22 20.1 59 72 1.25 0.696 11.743 0.173 0.06141 0.00177 11.826 0.181 0.05577 0.00373 523 8 443 149 -18.1 S 19 15.2 349 657 1.94 0.089 11.752 0.093 0.05766 0.00074 11.762 0.094 0.05694 0.00090 526 4 489 35 -7.5 S 20 8.2 362 354 1. 01 0.039 11.737 0.089 0.05859 0.00070 11.741 0.089 0.05827 0.00077 527 4 540 29 2.4 S 17 1 7. 1 109 116 1.09 0.810 10.682 0.127 0.05858 0.00129 10.769 0.133 0.05208 0.00298 572 7 289 131 -98.2 S 40 38.1 250 40 0.17 0.318 10.503 0.243 0.06495 0.00109 10.537 0.245 0.06234 0.00171 584 13 686 58 14.8 S 26 24.1 90 45 0.52 0.214 10.176 0.265 0.06721 0.00182 10.198 0.267 0.06544 0.00254 603 15 789 81 23.5 S 23 21.1 141 145 1.06 -0.064 7.885 0.081 0.06456 0.00096 7.880 0.081 0.06508 0.00109 770 8 777 35 0.9 S 43 41.1 617 239 0.40 -0.037 6.786 0.150 0.06927 0.00274 6.784 0.150 0.06958 0.00275 886 19 916 81 3.2 S 41 39.1 41 30 0.75 0.483 6.088 0.181 0.07934 0.00213 6.117 0.183 0.07528 0.00359 976 28 1076 96 9.3 S 25 23.1 82 72 0.90 1.381 6.043 0.162 0.07813 0.00168 6.128 0.166 0.06670 0.00422 974 25 828 132 -17.6 S 2 2.1 80 96 1.24 0.582 5.587 0.069 0.07950 0.00112 5.620 0.071 0.07461 0.00199 1056 12 1058 54 0.2 S 38 36.1 160 142 0.92 0.397 5.473 0.131 0.07976 0.00103 5.495 0.132 0.07642 0.00164 1078 24 1106 43 2.6 S 51 49.1 154 141 0.95 0.195 5.392 0.130 0.07831 0.00109 5.403 0.131 0.07666 0.00145 1095 25 1112 38 1.
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