Skip to main content
. 2014 Jan 8;9(1):e84711. doi: 10.1371/journal.pone.0084711

Table 2. Summary of U-Th and (U-Th)/He zircon ages.

Single crystal name 232Th (ng) % ± 238U (ng) % ± 4He (ncc) % ± TAU (%) Th/U Ft (U-Th)/He equilibrium age ±1σ (U-Th)/He disequilibrium-corrected age +1σ −1σ
(ng) (ng) (ncc) (%) (ka) (ka) (ka) (ka) (ka)
HD-1 0.686 1.438 0.949 1.835 0.000871 4.7 4.9 0.718 0.75 8.64 0.61 13.3 1.1 0.9
HD-2 1.38 1.43 1.78 1.84 0.00185 1.9 2.5 0.772 0.79 9.11 0.51 15.0 0.9 1.0
HD-3 1.03 1.43 1.49 1.84 0.00132 2.8 3.2 0.684 0.82 7.62 0.45 12.5 0.9 0.8
HD-4 2.54 1.43 3.42 1.83 0.00355 2.2 2.7 0.737 0.85 8.51 0.48 13.8 0.8 1.0
HD-5 3.26 1.43 5.14 1.83 0.00540 1.3 2.1 0.630 0.87 8.66 0.47 10.7 0.7 0.7
HD-6 1.67 1.43 2.54 1.84 0.00375 2.0 2.6 0.654 0.84 12.5 0.7 17.2 1.1 1.3
HD-7 1.97 1.43 1.99 1.84 0.00203 1.9 2.5 0.986 0.78 8.70 0.48 8.79 0.52 0.50
HD-8 1.05 1.43 1.27 1.84 0.00123 1.8 2.4 0.822 0.76 8.76 0.49 10.3 0.6 0.7
HD-9 0.853 1.436 0.825 1.835 0.000631 5.0 5.3 1.027 0.79 6.44 0.47 9.36 0.64 0.80
HD-10 1.79 1.43 2.96 1.84 0.00581 1.4 2.1 0.601 0.85 16.6 0.9 28.6 1.5 1.9
HD-11 0.967 1.435 1.090 1.835 0.001656 1.5 2.2 0.881 0.76 13.6 0.7 16.5 1.4 1.1
HD-12 0.934 1.436 1.488 2.225 0.00142 5.0 5.4 0.623 0.82 8.37 0.62 13.8 1.2 1.1
HD-13 0.696 1.438 0.992 1.855 0.000890 2.0 2.6 0.697 0.79 7.98 0.45 13.1 1.2 0.8
HD-n7 0.583 1.456 0.916 1.845 0.000774 8.4 8.6 0.633 0.76 7.98 0.79 8.76 0.87 1.02
HD-n11 0.322 1.466 0.439 1.858 0.000325 10.9 11.1 0.728 0.65 8.01 0.97 8.45 1.15 1.01
HDA-1 1.70 1.4 2.71 1.82 0.00735 2.8 3.2 0.625 0.84 23.2 1.4 26.2 2.0 2.0
HDA-2 1.74 1.4 1.60 1.83 0.00518 1.5 2.1 1.079 0.75 28.3 1.5 39.5 2.4 2.7
HDA-3 1.09 1.4 1.61 1.84 0.00474 1.2 2.0 0.674 0.82 25.6 1.4 41.6 2.3 2.3
HDA-5 2.01 1.4 2.94 1.83 0.00976 1.2 2.0 0.678 0.85 27.7 1.5 38.6 2.5 2.6
HDA-6 2.50 1.4 4.18 1.83 0.0151 1.2 2.0 0.593 0.86 30.2 1.6 37.3 2.5 3.2
HDA-8 0.944 1.4 1.33 1.84 0.00345 2.1 2.6 0.706 0.76 23.9 1.4 37.2 2.9 2.0
HDA-9 4.81 1.4 6.88 1.82 0.0237 1.2 2.0 0.695 0.88 27.6 1.5 43.4 2.4 3.2
HDA-10 2.63 1.4 4.23 1.83 0.0122 1.2 2.0 0.617 0.87 23.8 1.3 35.3 2.9 2.6
HDA-11 2.44 1.4 3.76 1.81 0.0133 1.8 2.4 0.645 0.84 30.1 1.7 32.6 2.7 2.0
HDA-12 1.14 1.4 1.57 1.85 0.00347 1.4 2.2 0.720 0.76 20.5 1.1 32.7 2.1 2.0
HDA-13 3.96 1.4 3.81 1.84 0.00963 1.2 1.9 1.032 0.84 19.8 1.1 27.5 1.7 2.2
HDA-14 2.28 1.4 3.18 1.84 0.0104 1.6 2.2 0.710 0.82 28.1 1.5 29.6 1.9 1.7
HDA-15 1.21 1.4 1.68 1.84 0.00561 1.5 2.2 0.719 0.84 28.1 1.5 33.1 3.1 1.7
HDA-16 0.927 1.4 1.47 1.84 0.00439 1.3 2.1 0.626 0.81 26.5 1.4 43.3 2.2 3.0
HDA-17 0.639 1.4 0.942 1.835 0.00171 4.1 4.4 0.674 0.83 15.6 1.0 24.7 2.4 1.9
HDA-18 1.95 1.4 2.75 1.81 0.00786 1.9 2.5 0.704 0.86 23.4 1.3 26.7 1.8 2.1
HDA-n4 2.05 1.4 2.85 1.84 0.00969 1.3 2.1 0.714 0.80 30.0 1.6 31.3 2.2 1.8
HDA-n7 4.80 1.4 2.84 1.85 0.0105 1.4 1.9 1.679 0.75 29.2 1.6 29.6 1.6 1.6

4 He (ncc) volume of helium in ncc at STP; Sm <0.01 ng; TAU = total analytical uncertainty; Ft = alpha retention factor; D230 calculated from zircon Th/U and HD Th/U = 3.4 and HDA Th/U = 3.5; sampling locations: HD = 36S 602261E/4220954N; HDA = 36S 599557E/4215676N (UTM/WGS84). Age averages are error weighted with the error defined by the equilibrium age minus analytical error, and the disequilibrium-corrected age plus analytical error.