257 / 352
207
Pb
a
U
b
Pb
b
Th
b 206
Pbc
c 207
Pb
d
±2s
206
Pb
d
±2s ȡ
e
207
Pb
d
±2s
206
Pb
f
±2s
207
Pb
f
±2s
207
Pb
f
±2s Conc.
g
(cps) (ppm) (ppm)
U (%)
235
U (%)
238
U (%) (rho)
206
Pb (%)
238
U (Ma)
235
U (Ma)
206
Pb (Ma) (%)
Grain
A132 14121 74 30 0.79 0.2 6.055 1.8 0.3530 1.1 0.62 0.1244 1.4 1949 19 1984 16 2020 25 96
A024
6360 25 11 1.07 0.2 6.146 2.6 0.3511 1.3 0.5 0.1270 2.2 1940 22 1997 23 2056 39 94
A108 12110 56 23 0.86 0.6 6.159 1.9 0.3587 1.2 0.60 0.1245 1.5 1976 20 1999 17 2022 27 98
A045
4262 17 8 1.17 0.4 6.187 3.0 0.3610 1.7 0.57 0.1243 2.4 1987 29 2003 26 2019 43 98
A062 12132 51 23 1.35 0.5 6.194 1.8 0.3607 1.2 0.64 0.1246 1.4 1985 20 2004 16 2023 25 98
A134 14140 71 31 1.19 0.4 6.198 1.9 0.3545 1.1 0.60 0.1268 1.5 1956 19 2004 17 2054 27 95
A151 70400 362 154 1.10 0.0 6.229 1.4 0.3584 1.1 0.83 0.1260 0.8 1975 19 2009 12 2044 13 97
A041
3959 17 7 0.75 0.7 6.231 4.0 0.3628 1.3 0.33 0.1246 3.7 1995 23 2009 35 2023 66 99
A094 10519 49 21 1.10 0.0 6.235 1.8 0.3552 1.1 0.59 0.1273 1.5 1960 18 2009 16 2061 26 95
A131 46915 227 106 1.71 0.4 6.239 1.3 0.3556 1.0 0.79 0.1272 0.8 1961 17 2010 11 2060 14 95
A053 12809 56 25 1.34 b.d.
6.248 1.9 0.3596 1.4 0.74 0.1260 1.3 1980 24 2011 17 2043 23 97
A095 28093 262 95 0.15 0.2 6.268 1.6 0.3594 1.2 0.72 0.1265 1.1 1979 20 2014 14 2050 20 97
A060 25991 87 46 1.95 6.3 6.271 4.5 0.3664 1.3 0.30 0.1241 4.3 2012 23 2014 40 2017 76 100
A167 16433 77 34 1.10 1.3 6.294 2.2 0.3622 1.2 0.53 0.1260 1.9 1993 20 2018 19 2043 33 98
A101 14914 142 54 0.32 0.1 6.298 1.6 0.3660 1.1 0.69 0.1248 1.1 2011 18 2018 14 2026 20 99
A144 29183 308 119 0.47 0.1 6.304 1.5 0.3603 1.0 0.64 0.1269 1.2 1983 17 2019 13 2056 21 96
A154 10660 55 22 0.74 0.0 6.305 1.6 0.3546 1.1 0.68 0.1290 1.2 1957 19 2019 14 2084 21 94
A023
6829 27 11 0.71 0.5 6.325 3.0 0.3632 1.5 0.48 0.1263 2.7 1997 25 2022 27 2047 47 98
A126
8815 41 19 1.54 0.2 6.343 2.1 0.3599 1.3 0.60 0.1278 1.7 1982 22 2024 19 2068 30 96
A040 48833 209 81 0.40 0.1 6.350 1.3 0.3684 1.1 0.80 0.1250 0.8 2022 18 2025 12 2029 14 100
A129
4840 24 10 0.67 0.0 6.362 2.2 0.3602 1.2 0.55 0.1281 1.8 1983 21 2027 20 2072 32 96
A115
6307 29 12 0.69 0.2 6.363 2.3 0.3682 1.4 0.60 0.1253 1.8 2021 24 2027 20 2034 32 99
A109 31232 143 57 0.58 0.1 6.365 1.3 0.3638 1.0 0.79 0.1269 0.8 2000 18 2027 11 2055 14 97
A133
9776 46 19 0.97 0.3 6.372 2.5 0.3651 1.4 0.57 0.1266 2.1 2006 24 2028 22 2051 36 98
A029 27008 107 45 0.93 0.4 6.372 1.5 0.3624 1.1 0.75 0.1275 1.0 1993 20 2028 13 2064 18 97
A087 15681 67 31 1.43 0.5 6.391 2.3 0.3679 1.3 0.59 0.1260 1.9 2019 23 2031 20 2043 33 99
A046 20708 90 38 0.92 0.1 6.401 2.0 0.3648 1.2 0.62 0.1272 1.5 2005 21 2032 17 2060 27 97
A088
6961 30 13 0.79 0.4 6.402 2.1 0.3674 1.5 0.72 0.1264 1.5 2017 27 2033 19 2049 26 98
A074
9241 38 17 0.95 0.8 6.406 2.2 0.3673 1.5 0.65 0.1265 1.7 2017 25 2033 20 2050 30 98
A072
5133 23 10 0.72 0.0 6.413 2.5 0.3683 1.3 0.49 0.1263 2.2 2022 22 2034 23 2047 39 99
A055 14249 58 25 1.13 0.5 6.422 2.0 0.3608 1.1 0.54 0.1291 1.7 1986 18 2035 17 2086 29 95
A056 17560 73 31 0.94 0.3 6.443 2.0 0.3719 1.4 0.70 0.1257 1.4 2038 24 2038 18 2038 25 100
A097 12351 55 23 0.81 0.3 6.446 2.3 0.3671 1.3 0.58 0.1273 1.9 2016 23 2039 20 2062 33 98
A090
6263 28 12 0.98 0.1 6.448 2.0 0.3677 1.3 0.64 0.1272 1.5 2018 22 2039 17 2059 27 98
A138
6463 29 14 1.69 0.4 6.448 3.4 0.3622 1.6 0.47 0.1291 3.0 1992 28 2039 31 2086 53 96
A047 50745 206 84 0.72 0.0 6.472 1.4 0.3624 1.1 0.82 0.1295 0.8 1994 19 2042 12 2091 14 95
A077
4860 22 10 1.19 b.d.
6.472 2.3 0.3722 1.1 0.48 0.1261 2.0 2040 19 2042 20 2044 35 100
A013
8205 32 14 0.91 0.1 6.483 1.8 0.3689 1.2 0.67 0.1275 1.3 2024 21 2044 16 2063 23 98
A083 25218 108 40 0.26 0.3 6.493 1.7 0.3627 1.1 0.63 0.1298 1.4 1995 19 2045 15 2096 24 95
A052 10709 44 19 1.07 0.1 6.501 1.9 0.3684 1.2 0.66 0.1280 1.4 2022 21 2046 16 2070 25 98
A016
7834 30 13 0.83 0.3 6.503 2.4 0.3739 1.3 0.57 0.1261 1.9 2048 24 2046 21 2045 34 100
A038
6032 23 10 1.09 0.0 6.542 1.9 0.3669 1.2 0.62 0.1293 1.5 2015 21 2052 17 2088 27 96
A012 10037 38 16 0.75 0.2 6.550 1.9 0.3729 1.1 0.57 0.1274 1.6 2043 19 2053 17 2062 28 99
A137 26719 131 53 0.74 0.1 6.567 1.4 0.3656 1.1 0.80 0.1303 0.8 2009 19 2055 12 2102 15 96
A142
9468 45 21 1.23 0.1 6.580 1.8 0.3722 1.1 0.61 0.1282 1.4 2040 19 2057 16 2074 25 98
A128 10814 50 21 0.84 b.d.
6.580 2.0 0.3692 1.2 0.62 0.1293 1.6 2026 22 2057 18 2088 28 97
A153 19747 98 43 1.06 0.0 6.607 1.5 0.3730 1.0 0.70 0.1284 1.0 2044 18 2060 13 2077 18 98
A099
6090 28 12 1.11 b.d.
6.610 2.5 0.3721 1.5 0.59 0.1288 2.0 2039 26 2061 22 2082 36 98
A073 15401 68 29 0.73 0.1 6.617 1.7 0.3742 1.2 0.68 0.1283 1.3 2049 20 2062 15 2074 22 99
A044 34644 296 121 0.54 0.1 6.629 1.5 0.3769 1.2 0.83 0.1276 0.8 2062 21 2063 13 2065 14 100
A119 12658 56 24 0.77 0.1 6.631 1.8 0.3747 1.2 0.70 0.1283 1.3 2052 22 2063 16 2075 22 99
A066
6235 26 11 0.69 0.0 6.644 2.3 0.3774 1.4 0.58 0.1277 1.9 2064 24 2065 21 2066 34 100
A032 10590 42 18 0.77 b.d.
6.688 1.9 0.3755 1.2 0.64 0.1292 1.5 2055 22 2071 17 2087 26 98
A089 23011 108 49 1.10 0.2 6.719 1.8 0.3814 1.3 0.76 0.1278 1.1 2083 24 2075 16 2068 20 101
A096 19731 85 37 1.00 0.1 6.720 1.7 0.3726 1.1 0.68 0.1308 1.2 2042 20 2075 15 2109 22 97
A110 43415 189 80 0.88 b.d.
6.758 1.3 0.3664 1.0 0.81 0.1337 0.8 2013 18 2080 11 2148 13 94
A012b 7536 33 14 1.00 0.0 6.766 2.2 0.3763 1.3 0.62 0.1304 1.7 2059 24 2081 19 2104 30 98
A082 50146 209 89 0.88 0.2 6.779 1.3 0.3798 1.0 0.82 0.1295 0.7 2075 19 2083 11 2091 13 99
A091 33016 278 122 1.00 0.2 6.804 1.6 0.3749 1.2 0.74 0.1316 1.1 2053 21 2086 15 2120 19 97
A014b 13212 57 26 1.05 0.1 6.810 1.9 0.3824 1.2 0.61 0.1292 1.5 2088 21 2087 17 2087 27 100
A011b 11930 49 22 0.87 0.6 6.837 2.0 0.3825 1.1 0.56 0.1296 1.7 2088 20 2091 18 2093 29 100
A079 27017 225 96 0.60 0.1 6.866 1.6 0.3856 1.2 0.75 0.1291 1.0 2102 21 2094 14 2086 18 101
A009b 28453 65 36 0.91 10.1 6.873 5.2 0.3894 1.4 0.28 0.1280 5.0 2120 26 2095 47 2071 88 102
A084 35012 149 66 0.91 0.0 6.879 1.3 0.3817 1.1 0.79 0.1307 0.8 2084 19 2096 12 2107 14 99
241