Nova Terra 52

221 RM3 STDc-5 91500-Part1 3687,2 48,1 9,236 0,39 0,1001 0,1877 6,17 1,876 7,0478 0,07254 3,41 STDc-30 91500-Part1 3506,7 42,22 7,384 0,4 0,0096 0,1679 6,78 1,769 7,3491 0,07645 2,84 STDc-55 91500-Part1 3360,7 44,74 9,047 0,377 0,242 0,1986 5,78 1,98 6,4928 0,07236 2,96 STDc-5 91500_Part2 3478,1 46,85 8,471 0,386 0,0038 0,1747 5,96 1,853 6,6203 0,07697 2,88 STDc-30 91500_Part2 3340,3 48,67 8,791 0,365 0,0031 0,1756 6,03 1,849 6,6379 0,07638 2,78 STDc-55 91500_Part2 3439,3 48,42 9,09 0,387 0,0212 0,1818 4,86 1,896 5,6301 0,07566 2,84 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) (%) STDc-80 91500_Part2 3402,7 50,9 9,269 0,37 0,0308 0,1764 5,63 1,826 6,2056 0,0751 2,6 STDc-105 91500_Part2 3336,4 48,94 8,893 0,38 0,0509 0,1759 6,2 1,805 6,7148 0,07444 2,58 STDc-130 91500_Part2 3212,9 43,5 8,318 0,388 0,0191 0,1847 6,23 1,911 6,7909 0,07506 2,69 STDc-155 91500_Part2 3257,7 49,39 8,66 0,348 0,0244 0,1713 5,92 1,783 6,6022 0,07555 2,93 STDc-181 91500_Part2 3396,6 51,43 9,371 0,383 b.d. 0,1763 5,58 1,863 6,2991 0,07669 2,92 3401,7 47,56 8,775 0,38 0,0505 0,1791727 5,92 1,855545 6,581 0,0752 2,86 0,88 1108,7 62,84 1073 46,68 1000,1 69,196795 111 0,92 1000,3 62,8 1034 47,67 1105,9 56,809462 90 0,89 1167,7 61,7 1109 43,81 995,23 60,249992 117 0,9 1037,7 57,14 1064 43,66 1119,5 57,408711 93 0,91 1043,1 58,04 1063 43,74 1104 55,628712 94 0,86 1076,7 48,19 1080 37,42 1085,2 56,977885 99 0,91 1047,5 54,47 1055 40,72 1070,3 52,271089 98 0,92 1044,7 59,78 1047 43,87 1052,6 52,027809 99 0,92 1092,6 62,66 1085 45,26 1069,3 54,10087 102 0,9 1019,2 55,79 1039 42,95 1082,3 58,686629 94 0,89 1046,6 53,92 1068 41,62 1112,2 58,311954 94 0,9 1062,2 57,94 1065 43,4 1072,4 57,424537 99 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