Table 1 Summary of 40Ar/39Ar data from lava flow sites.

Ages calculated relative to 1.1864 Ma Alder Creek sanidine standard (37). Decay constants are from (52). Atmospheric 40Ar/36Ar = 298.56 ± 0.31 (57). No. of expts, number of experiments performed on each sample. N, number of steps included from the total.

SampleVGP lat.
(°)
No. of
expts
Total fusion40Ar/36Ari ± 2σIsochronN39Ar %MSWDPlateau
Age
(ka) ± 2σ
Age
(ka) ± 2σ
Age
(ka) ± 2 σ
Haleakala
H-15-2980.61618 ± 19300 ± 6617 ± 6610 of 1195.50.87627.0 ± 16.0
H-15-2884.22734 ± 5300 ± 4715 ± 2323 of 3475.30.98725.6 ± 5.2
86C529A/27B286.51732 ± 8300 ± 7717 ± 6614 of 1688.70.44727.9 ± 9.2
85M001A/27B86.52744 ± 3302 ± 5740 ± 1417 of 2176.50.89749.2 ± 3.5
H-15-27A−44.23764 ± 5299 ± 3767 ± 1940 of 5188.10.50771.0 ± 4.5
H-15-27−47.94752 ± 4298 ± 3781 ± 2246 of 6976.10.67770.8 ± 4.2
84C436A/25A−38.24766 ± 3298 ± 3778 ± 2559 of 7779.40.86773.9 ± 3.5
H-15-24A−16.71754 ± 3299 ± 6776 ± 139 of 1582.80.29775.7 ± 4.3
H-15-2462.03756 ± 7297 ± 3772 ± 2533 of 5877.20.92773.4 ± 6.3
H-15-21−67.56753 ± 4298 ± 3775 ± 2059 of 8085.00.41771.7 ± 3.6
Quebrada Turbia, Chile
QTW11-2087.41711 ± 8295 ± 9754 ± 319 of 1477.80.93740.4 ± 7.2
QTW11-1980.21742 ± 19297 ± 6775 ± 966 of 984.10.91758.0 ± 21.0
QTW11-16−24.81766 ± 5299 ± 7780 ± 1910 of 1678.40.63781.7 ± 5.8
QTW11-11−26.11754 ± 6299 ± 7770 ± 2811 of 1778.90.43781.4 ± 5.6
QTW11-5−25.71775 ± 4299 ± 10787 ± 2410 of 1683.61.60786.3 ± 5.3
QTW11-3−21.81766 ± 7296 ± 6783 ± 2811 of 1878.40.79785.0 ± 6.6
QTW10-10−25.61779 ± 4296 ± 6787 ± 1310 of 1291.50.77782.0 ± 5.1
QTW10-5−18.61779 ± 2297 ± 9776 ± 178 of 2156.71.13784.2 ± 3.1
QTW10-3−8.91782 ± 3296 ± 8787 ± 712 of 1495.80.85785.3 ± 3.8
Guadeloupe
GA0207B−61.01713 ± 16298 ± 6784 ± 638 of 1467.80.29786.0 ± 15.0
GA010B−14.41746 ± 8298 ± 14778 ± 428 of 1380.10.64786.3 ± 7.5
GD0103B−79.01766 ± 7299 ± 4772 ± 169 of 1564.90.83783.5 ± 6.8
Tahiti: Punaruu South
TT−34.01743 ± 6296 ± 10778 ± 418 of 1763.20.60777.4 ± 6.1
R1V−33.12768 ± 8300 ± 4766 ± 1515 of 3071.60.73774.4 ± 5.4
R1T−41.91741 ± 6294 ± 8791 ± 469 of 1857.50.56777.0 ± 6.9
R1S−73.51755 ± 8301 ± 7772 ± 249 of 1677.70.75789.1 ± 6.2
Tahiti: Punaruu North
TM2874.61713 ± 9299 ± 8761 ± 408 of 1363.00.41772.6 ± 9.3
TM3081.51734 ± 10300 ± 4765 ± 2611 of 1784.10.69774.4 ± 8.7
TM3162.52771 ± 5297 ± 3785 ± 1317 of 2978.10.65791.1 ± 4.6
TM32−71.92745 ± 9298 ± 5789 ± 3419 of 3780.40.81795.5 ± 6.7
TM24−24.52769 ± 4296 ± 4795 ± 1318 of 2979.31.07792.4 ± 3.8
TM2346.61775 ± 9298 ± 3788 ± 1510 of 1581.60.56794.3 ± 7.1
TM2743.51792 ± 7294 ± 19796 ± 267 of 1267.90.49801.1 ± 6.7
TM20-561.32772 ± 6298 ± 3785 ± 1521 of 3584.30.65793.6 ± 4.6
TM1856.51752 ± 8297 ± 12790 ± 446 of 1462.10.47794.4 ± 6.7
TM13−70.01689 ± 10298 ± 8821 ± 466 of 1356.10.34819.0 ± 13.0
La Palma
TN1576.71681 ± 13299 ± 3675 ± 3620 of 2294.10.47687.0 ± 11.0
TN16−5.42765 ± 5298 ± 1766 ± 1243 of 4693.40.85771.7 ± 4.3
TN17−31.11762 ± 9299 ± 3762 ± 2915 of 1992.30.76774.3 ± 7.9
TN20−31.62739 ± 6296 ± 6785 ± 2916 of 3470.70.97774.8 ± 5.3