Nova Terra 52

RM2 STDb-4 Temora 1379 53 3,9 0,13 5,2 0,06866 4,3 0,5243 5,8 0,05542 3,9 STDb-29 Temora 847 35 2,4 0,10 3,4 0,06807 11 0,5168 13 0,05510 6,7 STDb-54 Temora 1187 55 3,7 0,091 2,9 0,06653 5,5 0,5111 6,8 0,05573 4,1 STDb-79 Temora 4983 239 16 0,11 2,4 0,06674 3,3 0,5025 4,0 0,05463 2,4 grain name / 207 Pb a U b Pb b Th b 206 Pbc c 206Pb d ±2 ʍ 207Pb d ±2 ʍ 207Pb d ±2 ʍ sample (cps) (ppm) (ppm) U (%) 238 U (%) 235 U (%) 206 Pb (%) rho e 206Pb ±2 ʍ 207Pb ±2 ʍ 207Pb ±2 ʍ conc f 238 U (Ma) 235 U (Ma) 206 Pb (Ma) (%) STDb-104 Temora 5166 252 17 0,14 2,1 0,06652 3,6 0,5050 4,3 0,05509 2,4 STDb-129 Temora 1291 63 4,3 0,19 1,3 0,06825 5,2 0,5125 6,6 0,05448 4,1 STDb-154 Temora 2074 97 6,6 0,31 0,75 0,06626 5,7 0,5041 7,0 0,05520 4,0 STDb-179 Temora 2803 135 9,2 0,42 0,30 0,06588 4,0 0,5009 5,1 0,05517 3,2 STDb-204 Temora 1264 61 4,0 0,23 0,43 0,06567 5,6 0,4897 6,9 0,05410 4,1 STDb-229 Temora 1014 48 3,2 0,19 1,3 0,06616 9,0 0,5048 13 0,05536 8,9 STDb-247 Temora 2298 109 7,2 0,13 1,9 0,06637 4,6 0,5035 5,5 0,05505 3,1 2210 104 7,0 0,19 b.d. 0,06683 3,0 0,5068 3,6 0,05503 1,7 0,74 0,0000 17,84760 428,1 20,4 428,0 87,9 100,0 0,86 0,0000 ####### 423,0 44,5 415,1 148,8 102,3 0,80 0,0000 22,12799 419,2 23,5 440,8 90,6 94,2 0,80 0,0000 13,12093 413,4 13,7 396,2 53,8 105,1 0,83 0,0000 14,36629 415,1 14,7 415,0 54,0 100,0 0,78 0,0000 21,41188 420,1 22,8 390,1 92,2 109,1 0,81 0,0000 ####### 414,4 23,7 419,2 90,4 98,7 0,78 0,0000 15,86415 412,3 17,2 418,2 70,5 98,4 0,81 0,0000 ####### 404,7 23,2 374,4 91,3 109,5 0,71 0,0000 35,81466 415,0 43,0 425,9 198,7 97,0 0,83 0,0000 18,55321 414,1 18,9 413,2 68,4 100,3 0,80 0,0000 0,00000 416,3 12,3 412,4 37,6 101,3 Spot sizes = 25 and 35 μ m; crater depth ~15 μ m. 206 Pb/ 238 U error is the quadratic additions of the within run precision (2 SE) and the external reproducibility (2 SD) of the primary reference material. 207 Pb/ 206 Pb error propagation (207Pb signal dependent) following Gerdes & Zeh (2009). 207 Pb/ 235 U error is the quadratic addition of 207 Pb/ 206 Pb and 206 Pb/ 238 U uncertainies. a Within run background-corrected mean 207 Pb signal in cps (counts per second). b U and Pb content and Th/U ratio were calculated relative to the primary reference material. c Percentage of common Pb on the 206 Pb. b.d. = below dectection limit. d Corrected for background, within-run Pb/U fractionation (in case of 206 Pb/ 238 U) and common Pb using Stacy and Kramers (1975) model Pb composition and subsequently normalised to the primary reference material (ID-TIMS value/measured value); 207 Pb/ 235 U calculated using 207 Pb/ 206 Pb / ( 238 U/ 206 Pb * 1/137.84). e Rho is the 206 Pb/ 238 U / 207 Pb/ 235 U error correlation coefficient. f Degree of concordance = 206 Pb/ 238 U age / 207 Pb/ 206 Pb age x 100 g RM1: Primary reference material g Accuracy and reproducibilty was checked by repeated analyses of secondary reference materials; data given as mean with 2 standard deviation uncertainties. Appendix I