Table 2. 

Ion probe zircon U–Pb geochronological data from Bjørneøen and the Qussuk area

Spot number[U] (ppm)[Th] (ppm)Th/U measuredf206 (%)207Pb/206Pb±σ (%)207Pb/235U±σ (%)206Pb/238U±σ (%)207Pb/206Pb age (Ma)±σ (Ma)Discordance (% conventional)
Sample 479827
110868180.7530.010.232470.1119.247301.700.600481.703069.21.7−1.5
2194413160.6770.010.232690.0819.376301.710.603931.713070.71.3−1.0
36234080.6550.020.232810.1419.018501.710.592481.703071.52.2−2.9
4166310600.6380.010.232450.0919.712201.710.615041.703069.01.50.9
5153930.6100.050.230910.2918.292701.730.574561.703058.44.6−5.4
612515250.4190.010.231070.1019.158001.700.601321.703059.51.6−1.0
7226526601.1740.010.232700.0719.803701.700.617241.703070.71.11.2
857200.3530.070.223520.4517.853201.930.579291.883006.27.2−2.5
9261117100.6550.010.232740.0819.816901.700.617531.703071.01.21.2
108955540.6190.010.232880.1419.438201.710.605381.703071.92.2−0.8
1113108510.6490.010.232690.1119.090201.710.595021.703070.61.7−2.5
12179012780.7140.010.233040.0819.777301.700.603761.703072.01.7−1.1
1413885960.4300.010.232540.0919.655401.700.613021.703069.61.50.5
1514449370.6490.010.232510.0919.149701.700.597341.703069.41.5−2.1
168583670.4270.010.230960.1119.392101.710.608961.703058.71.80.3
17100910241.0150.010.225540.1518.711601.710.601701.703020.72.40.7
18286014010.4900.000.233010.0620.725401.700.645111.703072.81.05.6
19222449802.2400.010.233050.0719.656301.710.611711.703073.11.10.2
2013019970.7670.010.232850.1019.516501.710.607891.713071.81.6−0.4
219127160.7850.010.230660.8523.248907.040.731006.993056.713.520.5
Sample 477385
21581510.954{3.25}0.208030.2817.952201.430.625881.402890.34.610.6
61067650.0610.010.215920.1916.966001.410.569871.392950.53.1−1.8
141275690.0540.010.219140.0917.814801.420.589601.422974.41.50.6
41943830.0430.010.219440.0817.647601.400.583271.402976.61.4−0.6
31923560.0290.010.219500.1217.674601.440.583991.432977.12.0−0.5
152326640.0280.010.219810.1117.785101.390.586831.392979.31.7−0.1
12218700.0310.010.219860.0717.544901.410.578771.402979.61.2−1.5
9857430.0500.030.220490.2019.075901.440.627481.422984.33.16.6
82228760.0340.010.220550.0917.772701.400.584451.392984.71.4−0.7
111847960.0520.010.220820.0817.752901.390.583081.392986.71.3−1.1
101356420.0310.010.221100.0917.864101.390.586001.392988.71.5−0.6
121259880.0700.010.221290.1218.114201.430.593681.422990.11.90.6
1713711830.1330.010.221460.0918.257901.390.597941.392991.31.51.3
161679730.0440.010.221540.1017.947701.390.587571.392991.91.6−0.5
7639320.0500.010.221550.1417.677901.400.578701.392992.02.2−2.0
51992810.0410.010.222160.1317.857101.390.582961.392996.42.0−1.5
13233860.3700.130.227920.3917.709301.540.563521.493037.56.2−6.4
Sample 477367
3984840.0850.470.215010.1916.734001.410.564471.402943.73.1−2.5
119552060.1060.010.217400.0817.354301.390.578961.392961.51.2−0.7
513271840.1390.010.218190.1217.486401.400.581251.392967.42.0−0.6
1413221460.1100.010.218360.1217.462701.400.580011.392968.61.9−0.8
1010201150.1120.030.218570.1517.633101.400.585111.402970.22.40.0
18828710.0860.010.219060.1217.311201.400.573151.392973.81.9−2.2
7946690.0730.010.219190.1117.665601.400.584531.402974.81.8−0.3
6905790.0880.010.219400.1617.665701.410.583961.402976.32.6−0.5
211911860.1560.010.219460.1117.597401.400.581571.402976.71.7−0.9
13969840.0870.010.219770.1317.696901.400.584031.392979.02.1−0.6
1217061860.1090.010.220070.0817.631201.400.581051.402981.21.3−1.2
9882430.0490.010.220170.1217.867301.390.588561.392982.01.90.1
417102120.1240.010.220640.1517.771701.410.584181.402985.42.5−0.8
15862450.0520.010.221250.1418.038501.400.591321.392989.82.20.2
8631480.0760.020.221940.2018.281901.400.597421.392994.83.11.0
115211270.2440.030.227820.1818.522601.410.589681.393036.82.9−2.0
16267720.2710.020.230140.2219.901301.430.627161.413053.03.53.5
173391580.4660.020.232260.1819.425101.400.606581.393067.72.9−0.5
Sample 477352
1Low-U43400.9200.100.222860.6018.301601.810.595611.713001.49.60.4
2Tip1253200.0160.010.219730.1117.423701.710.575121.702978.71.8−2.1
3Tip1681330.0200.010.220490.1018.253201.700.600401.702984.31.52.0
4Tip1361290.0210.010.218650.1217.325601.710.574701.702970.82.0−1.8
5Tip2742440.0160.010.218380.1517.977001.730.597041.722968.82.32.1
6Core3231400.0130.030.198760.2616.287401.790.594321.772816.14.28.5
7Tip3331860.0260.030.194620.0814.288701.700.532481.702781.61.2−1.3
8Core146750.0040.010.219420.1317.835401.710.589521.702976.52.10.5
9Tip2142540.0250.010.220500.0818.036101.700.593251.702984.31.40.8
10Tip1277320.0250.010.220190.1117.709201.700.583311.702982.11.8−0.8
11Core3116470.0150.010.198070.4616.064802.450.588252.412810.37.57.7
12Low-U58591.0290.110.220230.5217.947301.780.591051.712982.48.30.5
13Low-U95910.9630.060.224240.3918.354801.750.593651.703011.46.2−0.3
14Tip1588350.0220.020.220830.0918.396501.700.604201.702986.71.52.5
15Core3395710.0210.010.213630.1918.057401.740.613031.732933.33.16.4
16Tip2113320.0150.000.221820.0818.919001.700.618591.702993.91.34.6
17Core174690.0050.010.217240.1717.855501.710.596121.712960.32.82.3
18Tip1489280.0180.010.219040.1318.160701.710.601331.702973.62.02.6
19Tip1289450.0350.020.220430.1218.355101.710.603921.702983.92.02.6
20Tip1901410.0210.010.220480.0918.742901.700.616561.702984.21.54.7
21Low-U40310.7730.100.221660.6218.238101.820.596751.712992.89.91.0
Sample 477320
17264430.6100.020.221680.1517.482201.710.571961.702993.02.4−3.2
25542880.5200.020.223750.1718.101601.710.586741.703007.92.7−1.3
36703730.5570.010.221030.1817.811301.710.584451.702988.23.0−0.9
47915190.6560.020.223490.1618.209801.710.590961.703006.02.5−0.5
55033200.6350.030.222160.1818.228401.710.595081.702996.42.80.6
64753170.6680.030.223640.2217.979601.720.583071.703007.13.5−1.9
74522750.6090.020.221670.1918.072201.710.591281.702992.93.00.1
84752470.5190.030.221550.2418.210701.720.596141.702992.03.90.9
93812040.5350.060.221260.2316.981601.720.556631.702989.93.7−5.7
105553070.5540.040.222710.1718.165401.710.591571.703000.42.8−0.2
Sample 477318
18563830.4480.010.221250.1617.204202.140.563972.132989.82.6−4.4
2253823450.9240.000.222220.0817.821302.130.581642.132996.81.4−1.7
31221461.2010.060.220010.3717.415402.200.574112.172980.85.9−2.3
4381880.2320.020.221710.2117.283302.150.565392.142993.13.3−4.3
567510.7650.070.224880.4917.906001.780.577491.713016.07.9−3.2
6302180.0590.030.221160.2517.299601.720.567321.702989.24.0−3.8
779450.5710.050.219950.4716.829201.770.554941.702980.37.5−5.6
88703270.3760.040.213230.1716.452201.710.559581.702930.32.8−2.8
91319530.0400.010.214050.1116.496301.710.558941.702936.51.8−3.1
10307932951.0700.000.220500.1018.083001.700.594791.702984.31.71.0
119444450.4710.010.220500.1517.584801.710.578401.702984.42.4−1.8
126322220.3510.030.221240.1618.233101.710.597721.702989.72.51.3
1312926500.5040.010.218630.1516.977401.710.563191.702970.72.4−3.8
1478640.8190.050.221480.5217.422101.780.570511.702991.58.4−3.4
1526080.0310.160.167860.3810.682001.740.461531.702536.46.3−4.3
  • Data obtained May–June 2005 with a Cameca 1270 ion probe, NORDSIM laboratory, Naturhistoriska Riksmuseet, Stockholm, Sweden (analytical details as given by Whitehouse et al. 1997). f206 is proportion of common 206Pb. (numbers 3, 9, 10, 14, 19 and 20).