Overview of Results from the Greenstone ... - Geology Ontario

Table A1. U/Pb isotopic data for zircon from sample localities in the southern Abitibi greenstone belt, Ontario.
206
Sample Analysis Description Weight U Th/U Pb* Pb C Pb/
204 Pb
206 Pb/
238 U ±
207
2σ Pb/
235 U ±
207
2σ Pb/
206 Pb ± 2σ
207 Pb/
206 Pb ± 2σ Disc. Corr.
Fraction no. (# = location on Figure 2 & Table 1) (mg) (ppm) (pg) (pg) Age (Ma) (%) Coeff.
04BHA-0333 #1, Felsic debris flow, south Thornburn Twp.
A1 MAH4098 1 clr, cls-ppink sharp, elong 0.0002 82 0.59 9.0 0.5 1018 0.52258 0.00399 13.4540 0.1165 0.18672 0.00063 2713.5 5.5 0.2 0.9223
A2 MAH4099 1 clr, cls-ppink sharp, elong 0.0001 81 0.55 4.9 0.6 488 0.52458 0.00713 13.5002 0.2075 0.18665 0.00109 2712.9 9.7 -0.3 0.9256
B1 MAH4080 1 clr, cls-pyell, stubby, sharp 0.0008 39 0.42 17.9 0.8 1244 0.52076 0.00250 13.3909 0.0752 0.18650 0.00046 2711.5 4.1 0.4 0.8996
B2 MAH4081 1 clr, pbr, stubby, sharp 0.0004 133 0.57 33.7 1.5 1296 0.55605 0.00167 15.6682 0.0631 0.20436 0.00043 2861.4 3.4 0.5 0.8603
B3 MAH4082 1 clr, cls-ppink, stubby, sharp 0.0004 88 0.87 22.9 0.6 2208 0.50485 0.00201 12.7341 0.0567 0.18294 0.00034 2679.7 3.1 2.0 0.9088
04BHA-0297 #2, Qz-fsp phyric felsic flow, central Loveland Twp.
Z1 DWD4689 1 clr, cls, stubby, with rod melt incl 0.0040 55 0.51 130.0 1.5 4963 0.52093 0.00171 13.4103 0.0455 0.18671 0.00030 2713.4 2.6 0.5 0.8846
Z2 DWD4690a 1 clr, cls, eq, with rod incl 0.0020 59 0.51 69.6 3.3 1221 0.52036 0.00199 13.3884 0.0641 0.18660 0.00051 2712.5 4.5 0.5 0.8211
Z3 DWD4691 1 clr, cls, eq 0.0015 89 0.50 57.6 0.6 5678 0.37736 0.00134 9.6567 0.0367 0.18560 0.00020 2703.5 1.7 27.6 0.9609
Z4 MAH4097a 1 clr, cls, stubby 0.0016 105 0.63 102.2 0.8 6778 0.52078 0.00135 13.4203 0.0392 0.18690 0.00018 2715.1 1.6 0.6 0.9433
04BHA-0462 #3, Granophyre, Kamiskotia gabbro, Robb Twp.
A1a MAH4102 1 clr, cls, elong 0.0007 100 0.37 39.4 0.6 3883 0.51833 0.00151 13.2758 0.0435 0.18576 0.00026 2705.0 2.3 0.6 0.9073
A1b MAH4107 1 clr, cls-pbr, irreg frag 0.0012 169 0.78 123.6 0.8 8591 0.51983 0.00182 13.3038 0.0464 0.18561 0.00031 2703.7 2.7 0.2 0.8870
A1c MAH4108 1 clr, cls, elong 0.0006 73 0.48 27.3 1.2 1337 0.51847 0.00184 13.2892 0.0608 0.18590 0.00041 2706.2 3.7 0.6 0.8817
03BHA-0382 #4, Rhyolite, Robb Twp.
A1 MAH4046 1 clr, pbr-br, short, sharp prism 0.0005 103 0.46 30.2 0.5 3486 0.52182 0.00153 13.3257 0.0433 0.18521 0.00026 2700.1 2.3 -0.3 0.9020
A2 MAH4047 1 clr, pbr-br, short, sharp prism 0.0003 237 0.41 37.3 0.7 3273 0.52189 0.00158 13.3195 0.0459 0.18510 0.00022 2699.1 2.0 -0.4 0.9407
A3 MAH4048 1 clr, pbr-br, short, sharp prism 0.0003 178 0.40 30.0 0.4 4760 0.52154 0.00162 13.3268 0.0446 0.18533 0.00025 2701.1 2.2 -0.2 0.9152
03BHA-0384 #5, Felsic lapilli tuff, Robb Twp.
A1 MAH4018 1 elong (3:1) clr, cls, prism, minor incl. 0.0016 23 0.56 22.5 2.6 491 0.51943 0.00246 13.2770 0.1128 0.18539 0.00106 2701.6 9.4 0.2 0.7709
A2 MAH4019 1 sl. elong (2:1) clr, pbr, prism, minor incl. 0.0019 333 0.79 392.6 1.8 11499 0.51914 0.00238 13.2671 0.0621 0.18535 0.00027 2701.3 2.4 0.3 0.9515
A3 MAH4020 1 eq, clr, cls, prism, minor incl. 0.0014 77 0.59 66.8 1.4 2631 0.52009 0.00155 13.2897 0.0453 0.18533 0.00029 2701.1 2.5 0.1 0.8920
A4 MAH4021 1 sl. elong (2:1), cls-pbr, clr, prism 0.0016 64 0.59 61.3 2.8 1215 0.51969 0.00195 13.2719 0.0641 0.18522 0.00046 2700.2 4.1 0.1 0.8634
03BHA-0345 #6, Felsic lapilli tuff, Godfrey Twp.
A1a MAH4043 1 clr, cls-pyell, stubby to eq prism 0.0014 36 0.53 29.8 5.8 305 0.52159 0.00236 13.3108 0.1669 0.18509 0.00174 2699.0 15.6 -0.3 0.7847
A1b MAH4044 1 clr, cls-pyell, stubby to eq prism 0.0011 28 0.56 18.2 0.3 3097 0.52148 0.00222 13.3197 0.0615 0.18525 0.00027 2700.4 2.4 -0.2 0.9508
A1c MAH4045 1 clr, cls-pyell, stubby to eq prism 0.0014 26 0.51 22.3 0.3 4524 0.52247 0.00199 13.3218 0.0542 0.18493 0.00021 2697.5 1.9 -0.5 0.9597
03BHA-0047 #7, Felsic lapilli tuff, eastern Turnbull Twp.
Z1 DWD4686 1 clr, cls, eq, flat 0.0020 75 0.49 87.7 0.8 6342 0.51661 0.00199 13.2165 0.0541 0.18555 0.00021 2703.1 1.9 0.8 0.9597
Z2 DWD4687c 1 clr, cls, short prism, with rod incl 0.0021 85 0.52 105.0 0.8 7173 0.51838 0.00162 13.2669 0.0437 0.18562 0.00024 2703.7 2.2 0.5 0.9187
Z3 DWD4688b 1 clr, cls, irregular 0.0019 33 0.47 36.3 0.7 2985 0.51844 0.00266 13.2509 0.0682 0.18537 0.00039 2701.5 3.5 0.4 0.9163
96JAA-094
#8, Rhyolite, Carscallen Twp. (Ayer et al., 2002)
Z1 MAH5037b 1 clr, cls, short prism 0.0003 114 0.75 22.8 0.6 1948 0.52239 0.00221 13.4218 0.0618 0.18634 0.00039 2710.2 3.5 0.0 0.8898
Z2 MAH5038 1 clr, cls, short prism 0.0007 86 0.50 35.7 0.4 4552 0.52297 0.00163 13.4469 0.0466 0.18649 0.00020 2711.4 1.7 0.0 0.9545
Z3 MAH5034a 1 clr, cls-pbr, gemmy, sharp short prism 0.0010 137 0.75 88.4 0.4 10602 0.53427 0.00118 14.9828 0.0384 0.20339 0.00018 2853.6 1.4 4.1 0.9437
04JAA-0004 #9, Deformed Timiskaming conglomerate, northeastern Thorneloe Twp.
Z1 DWD4692 1 large clr, pbr, eq and irreg 0.0320 26 0.60 509.8 2.9 9820 0.52459 0.00140 13.6092 0.0407 0.18815 0.00016 2726.1 1.4 0.3 0.9600
Z2 DWD4693 1 clr, cls, rounded 2:1 prism 0.0086 45 0.57 236.3 1.6 8389 0.52325 0.00234 13.5863 0.0635 0.18832 0.00018 2727.5 1.6 0.7 0.9795
Z4 DWD4695 1 clr, cls, euh, eq 0.0024 48 0.60 69.3 0.4 8744 0.51474 0.00137 13.0202 0.0388 0.18346 0.00019 2684.4 1.7 0.3 0.9374
Z5 DWD4696 1 clr, cls, euh, long prism 0.0005 84 0.67 25.4 0.4 3344 0.51340 0.00221 12.9914 0.0589 0.18353 0.00027 2685.0 2.4 0.6 0.9468
Z6 DWD4697 1 clr, brn, prism 0.0005 524 0.07 134.5 1.3 6484 0.49942 0.00124 12.1383 0.0341 0.17627 0.00021 2618.1 2.0 0.3 0.9017
Z7 MAH4091 1 clr, pbr, subeq, frag 0.0025 138 0.96 224.4 1.5 7982 0.52022 0.00123 13.4140 0.0362 0.18701 0.00019 2716.1 1.7 0.7 0.9294
Z8 MAH4092 1 clr, pbr, small subeq, frag 0.0004 326 0.81 81.0 0.8 5186 0.51263 0.00127 13.1302 0.0363 0.18576 0.00024 2705.0 2.1 1.7 0.8865
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