Table 8 in The Tumbarumba Basaltic Gem Field, New South Wales: In Relation to Sapphire-Ruby Deposits of Eastern Australia

Table 8. Summary of SHRIMP U-Pb zircon results for Tumbarumba sapphires. sample no. grain · spot204 Pb/ 206 Pbf 206f 206 %totaltotalradiogenicage (Ma)238 U/ 206 Pb ±207 Pb/ 206 Pb ±206 Pb/ 238 U ±206 Pb/ 238 U ±C461 · 10.0000411.15E-021.1519.960.2400.06190.00070.04950.0006311.63.72 · 10.0000145.03E030.5015.880.1790.05880.00040.06270.0007391.74.33 · 10.0001001.77E-030.1822.160.3280.05350.00050.04510.0007284.04.14 · 10.0000152.61E-030.2623.840.2620.05370.00040.04180.0005264.22.95 · 10.0000100.002160.2223.090.2610.05360.00050.04320.0005272.73.0C631 · 10.0008351.35E-021.35230.102.7470.05720.00110.00430.000127.60.31 · 20.0010571.01E-021.01275.603.9410.05440.00200.00360.000123.10.31 · 30.0000400.005890.597.080.0860.07230.00050.14040.0017846.79.72 · 10.0037390.09238.2387.581.1340.11240.00140.01050.000167.20.92 · 20.0005670.008060.81279.983.6210.05290.00170.00350.000122.80.33 · 10.0018940.015311.53280.334.8870.05860.00380.00350.000122.60.43 · 20.0000111.26E-03<0.016.660.0800.06770.00040.15030.0018902.710.2 Uncertainties given at the one level. f % denotes the percentage of 206 Pb that is common Pb 206 Correction for common Pb made using the measured 238 U/ 206 Pb and 207 Pb ratios following Tera & Wasserburg (1972) as outlined in Compston et al. (1992). U, Th, Pb* contents (ppm) (* = total radiogenic Pb). C46: 1.1 U 936, Th 428, Th/U 0.48, Pb 34; 2.1 U 1048, Th 193, Th/U 0.18, Pb 49; 3.1 U 1191, Th 353, Th/U 0.30, Pb 40; 4.1 U 1081, Th 320, Th/U 0.30, Pb 33; 5.1 U 1139, Th 409, Th/U 0.36, Pb 37. C63: 1.1 U 1454, Th 1227, Th/U 0.84, Pb 6; 1.2 U 861, Th 627, Th/U 0.73, Pb 3; 1.3 U 623, Th 212, Th/U 0.34, Pb 71; 2.1 U 867, Th 552, Th/U 0.64, Pb 7; 2.2 U 812, Th 1219, Th/U 1.50, Pb 3; 3.1 U 301, Th 524, Th/U 1.74, Pb 1; 3.2 U 573, Th 230, Th/U 0.40, Pb 72.