Nova Terra 52

232 RM4 STDc-5 91500 5088 72 14 0,4 0,00 0,18 2,4 1,9 2,9 0,07 1,7 STDc-30 91500 4869 71 13 0,4 0,03 0,18 2,3 1,9 3,4 0,08 2,6 STDc-55 91500 4769 69 13 0,4 0,08 0,18 2,2 1,9 3,5 0,08 2,8 STDc-80 91500 4517 68 13 0,4 0,11 0,18 2,1 1,9 3,0 0,08 2,2 STDc-105 91500 4401 68 13 0,4 0,04 0,18 2,4 1,9 4,1 0,08 3,4 STDc-130 91500 4310 67 13 0,4 0,08 0,19 2,2 2,0 3,2 0,08 2,3 STDc-155 91500 4158 69 13 0,4 0,06 0,18 2,2 1,9 3,1 0,07 2,2 STDc-180 91500 4105 69 13 0,4 0,11 0,18 2,3 1,9 3,6 0,07 2,8 STDc-205 91500 4062 69 13 0,4 0,04 0,19 2,2 1,9 3,3 0,08 2,4 STDc-230 91500 4018 71 14 0,4 0,07 0,18 2,3 1,9 3,5 0,07 2,7 STDc-246 91500 4013 74 14 0,4 0,04 0,18 2,4 1,9 4,5 0,08 3,8 4392 70 13 0,4 0,06 0,18 1,9 1,9 3,1 0,08 2,2 Supplementary Table 3.5 U-Pb geochronology of 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) (%) 0,81 1086 24 1074 19 1050 35 103 0,66 1075 22 1075 23 1075 52 100 0,62 1079 22 1094 24 1125 55 96 0,70 1087 21 1082 20 1074 43 101 0,58 1086 24 1085 28 1084 68 100 0,70 1099 22 1102 21 1108 45 99 0,71 1066 22 1065 20 1062 43 100 0,64 1083 23 1076 24 1063 56 102 0,67 1094 22 1090 22 1081 49 101 0,64 1093 23 1080 24 1054 55 104 0,53 1078 24 1079 30 1079 76 100 0,66 1084 19 1082 21 1078 45 101 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 6XSSOHPHQWDU\ PDWHULDO IRU &KDSWHU