Ages of seamounts, islands and plateaus on the Pacific plate version 2.1 - 15 May 2004 Valérie Clouard(1) and Alain Bonneville(2) [email protected] [email protected] (1) Departamento de Geofisica - U. de Chile Blanco Encalada 2002 / Casilla 2777 / Santiago / Chile Tel. : +56 2 678 42 96 / Fax: +56 2 696 86 86 (2) Lab. Géosciences Marines / Institut de Physique du Globe / CNRS 4, Place Jussieu/ 75252 Paris Cedex 05 / France Tel.:+33 1 44 27 68 94 / Fax: +33 1 44 27 99 69 This report presents a compilation of reliable dating of seamounts and islands of the Pacific plate (1300 samples). Paleomagnetic ages obtained from seamount magnetism have not been considered. We also do not consider foraminifers ages which only give minimum ages of seamounts. Only radiometric ages are thus considered, and Ar/Ar ages are preferred over K/Ar, when both exist at the same place. The following table presents the results of this compilation with the references of the selected data. An average age (as used in [1] and [2]) is proposed when several ages have been determined for the same volcanic stage, in this case the geographical coordinates are given only once on the line of the average age. When several volcanic stages exist for a same seamount or island, their ages are also presented with the same rule as above. NB: an ASCII file (ages_pacific_v2.1.dat) with only average ages and geographical coordinates is also available for plotting purposes. Averag Average Name (island, Long. E Latitude Age Error Island or seamount e age error seamount, plateau or Method Ref. (deg.) (deg.) (Ma) (Ma) chain (Ma) (Ma) sample) 209.26 -23.43 0.23 0.004 0.23 0.004 Arago smt. Austral K/Ar [3] 209.26 -23.43 8.24 0.65 8.24 0.65 Arago smt. Austral K/Ar [3] 218.78 -28.12 31.30 no val 30.05 no val Aureka Austral Ar/Ar - TF [4] 28.80 no val Aureka Austral Ar/Ar - TF [4] 31.30 0.74 31.30 0.74 Aureka Austral Ar/Ar - IH [4] 220.58 -27.68 26.10 no val 25.15 no val Evelyn Austral Ar/Ar - TF [4] 24.20 no val Evelyn Austral Ar/Ar - TF [4] 25.95 1.15 25.95 1.15 Evelyn Austral Ar/Ar - IH [4] 220.00 -27.48 23.40 no val 23.40 no val Herema Austral Ar/Ar - TF [4] 22.47 1.48 22.47 1.48 Herema Austral Ar/Ar - IH [4] 208.96 -22.56 54.8 0.8 54.8 0.8 Lotus bank Austral K/Ar [3] 219.80 -29.00 0.00 0.00 Macdonald Austral observation [5] 0.14 0.04 0.62 0.17 Macdonald Austral K/Ar [6] 0.17 0.05 Macdonald Austral K/Ar [6] 0.24 0.07 Macdonald Austral K/Ar [6] 0.33 0.10 Macdonald Austral K/Ar [6] Pacific ages compilation ver. 2.1 1/42 0.97 0.29 Macdonald Austral K/Ar [6] 0.85 0.25 Macdonald Austral K/Ar [6] 1.64 0.25 Macdonald Austral K/Ar [6] 219.78 -28.53 27.70 no val 27.70 no val Make Austral Ar/Ar - TF [4] 25.58 1.01 25.58 1.01 Make Austral Ar/Ar - IH [4] 216.50 -27.90 39.60 no val 39.60 no val Marotiri Austral Ar/Ar - TF [4] 3.75 no val 3.75 no val Marotiri Austral Ar/Ar - TF [4] 31.95 0.82 31.95 0.82 Marotiri Austral Ar/Ar - IH [4] 3.78 0.18 3.78 0.18 Marotiri Austral Ar/Ar - IH [4] 3.18 0.48 3.24 0.27 Marotiri Austral K/Ar [6] 3.25 0.16 Marotiri Austral K/Ar [6] 3.29 0.16 Marotiri Austral K/Ar [6] 5.44 0.27 5.29 0.33 Marotiri Austral K/Ar [6] 5.14 0.39 Marotiri Austral K/Ar [6] 213.83 -27.02 39.5 0.6 39.5 0.6 Neilson bank Austral K/Ar [3] 216.85 -27.03 31.70 no val 31.70 no val Opu Austral Ar/Ar - TF [4] 39.10 no val 39.10 no val Opu Austral Ar/Ar - TF [4] 33.94 0.62 33.94 0.62 Opu Austral Ar/Ar - IH [4] 218.88 -28.76 27.50 no val 27.50 no val Ra Austral Ar/Ar - TF [4] 29.21 0.61 29.21 0.61 Ra Austral Ar/Ar - IH [4] 212.30 -23.90 5.52 0.09 6.54 0.11 Raivavae Austral K/Ar [7] 6.78 0.13 Raivavae Austral K/Ar [7] 5.91 0.09 Raivavae Austral K/Ar [7] 7.26 0.13 Raivavae Austral K/Ar [7] 7.57 0.12 Raivavae Austral K/Ar [7] 6.21 0.10 Raivavae Austral K/Ar [7] 6.31 0.32 6.69 0.33 Raivavae Austral K/Ar [6] 6.38 0.32 Raivavae Austral K/Ar [6] 6.45 0.32 Raivavae Austral K/Ar [6] 6.44 0.32 Raivavae Austral K/Ar [6] 7.21 0.36 Raivavae Austral K/Ar [6] 7.32 0.37 Raivavae Austral K/Ar [6] 212.18 -24.18 32.7 32.7 0.5 Raivavae Austral K/Ar 0.5 (SW flank) [3] 215.70 -27.60 5.00 0.20 5.10 0.76 Rapa Austral K/Ar [8] 5.10 0.40 Rapa Austral K/Ar [8] 5.20 1.70 Rapa Austral K/Ar [8] 4.37 0.22 4.58 0.23 Rapa Austral K/Ar [6] 4.41 0.22 Rapa Austral K/Ar [6] 5.02 0.25 Rapa Austral K/Ar [6] Pacific ages compilation ver. 2.1 2/42 4.48 0.22 Rapa Austral K/Ar [6] 4.39 0.22 Rapa Austral K/Ar [6] 4.77 0.24 Rapa Austral K/Ar [6] 4.13 0.21 Rapa Austral K/Ar [6] 4.31 0.22 Rapa Austral K/Ar [6] 4.38 0.22 Rapa Austral K/Ar [6] 4.48 0.22 Rapa Austral K/Ar [6] 4.72 0.24 Rapa Austral K/Ar [6] 4.76 0.24 Rapa Austral K/Ar [6] 4.95 0.25 Rapa Austral K/Ar [6] 4.99 0.25 Rapa Austral K/Ar [6] 207.25 -22.60 4.78 0.52 non Rimatara Austral K/Ar [9] reliable 14.40 4.10 non Rimatara Austral K/Ar [9] reliable 21.20 0.60 non Rimatara Austral K/Ar [9] reliable 28.60 1.30 non Rimatara Austral K/Ar [9] reliable 208.70 -22.45 12.04 0.20 12.00 0.21 Rurutu Austral K/Ar [7] 12.21 0.21 Rurutu Austral K/Ar [7] 11.74 0.22 Rurutu Austral K/Ar [7] 8.43 0.14 8.43 0.14 Rurutu Austral K/Ar [7] 1.07 0.02 1.07 0.03 Rurutu Austral K/Ar [7] 1.05 0.02 Rurutu Austral K/Ar [7] 1.85 0.08 Rurutu Austral K/Ar [7] 0.60 0.03 0.81 0.04 Rurutu Austral K/Ar [9] 0.88 0.05 Rurutu Austral K/Ar [9] 0.96 0.03 Rurutu Austral K/Ar [9] 1.10 0.40 0.65 1.09 Rurutu Austral K/Ar [10] 0.20 0.60 Rurutu Austral K/Ar [10] 7.50 5.80 9.90 4.17 Rurutu Austral K/Ar [10] 11.00 4.20 11.10 2.71 Rurutu Austral K/Ar [10] 11.20 1.20 Rurutu Austral K/Ar [10] 1.79 0.13 1.67 0.13 Rurutu Austral K/Ar [6] 1.57 0.24 Rurutu Austral K/Ar [6] 1.74 0.09 Rurutu Austral K/Ar [6] 1.60 0.08 Rurutu Austral K/Ar [6] 1.68 0.13 Rurutu Austral K/Ar [6] 1.61 0.12 Rurutu Austral K/Ar [6] Pacific ages compilation ver. 2.1 3/42 12.21 0.61 12.07 0.61 Rurutu Austral K/Ar [6] 12.37 0.62 Rurutu Austral K/Ar [6] 12.98 0.65 Rurutu Austral K/Ar [6] 10.73 0.54 Rurutu Austral K/Ar [6] 210.50 -23.40 8.74 0.14 9.27 0.17 Tubuai Austral K/Ar [7] 8.43 0.15 Tubuai Austral K/Ar [7] 8.59 0.16 Tubuai Austral K/Ar [7] 10.60 0.21 Tubuai Austral K/Ar [7] 10.20 0.25 Tubuai Austral K/Ar [7] 8.63 0.16 Tubuai Austral K/Ar [7] 9.49 0.17 Tubuai Austral K/Ar [7] 9.48 0.16 Tubuai Austral K/Ar [7] 7.23 0.36 7.69 0.38 Tubuai Austral K/Ar [6] 7.84 0.39 Tubuai Austral K/Ar [6] 8.01 0.40 Tubuai Austral K/Ar [6] 9.53 0.48 9.88 0.49 Tubuai Austral K/Ar [6] 9.47 0.47 Tubuai Austral K/Ar [6] 9.48 0.47 Tubuai Austral K/Ar [6] 10.39 0.52 Tubuai Austral K/Ar [6] 10.53 0.53 Tubuai Austral K/Ar [6] 209.76 -20.72 58.1 0.8 58.1 0.8 ZEP2-1 Austral K/Ar [3] 206.89 -22.48 2.6 0.05 2.6 0.05 ZEP2-12 Austral K/Ar [3] 211.07 -26.40 8.78 0.13 8.78 0.13 ZEP2-19 Austral K/Ar [3] 213.70 -25.83 28 0.4 28 0.4 ZEP2-26 Austral K/Ar [3] 208.47 -22.34 12.2 0.2 12.2 0.2 ZEP2-7 Austral K/Ar [3] 163.00 5.30 2.60 0.30 1.80 0.18 Kusaie (East) Caroline K/Ar [11] 2.30 0.20 Kusaie (East) Caroline K/Ar [11] 1.20 0.10 Kusaie (East) Caroline K/Ar [11] 1.60 0.20 Kusaie (East) Caroline K/Ar [11] 1.30 0.10 Kusaie (North) Caroline K/Ar [11] 4.80 0.20 Ponape (Nan Model) Caroline K/Ar [11] 5.00 0.10 Ponape (Nan Model) Caroline K/Ar [11] 6.00 0.30 Ponape (Nan Model) Caroline K/Ar [11] 4.20 0.20 Ponape (East) Caroline K/Ar [11] 6.50 1.00 Ponape (East) Caroline K/Ar [11] 158.20 7.00 3.00 0.30 4.25 0.22 Ponape (North) Caroline K/Ar [11] 6.20 0.80 Ponape (North) Caroline K/Ar [11] 7.60 0.40 Ponape (North) Caroline K/Ar [11] 6.50 0.30 Ponape (North) Caroline K/Ar [11] 8.20 0.40 7.09 0.56 Ponape (West) Caroline K/Ar [11] Pacific ages compilation ver.