Web Supplement to “Ages of Seamounts, Islands and Plateaus on the Pacific Plate”, by Valérie Clouard & Alain Bonneville
Web Supplement to “Ages of seamounts, islands and plateaus on the Pacific Plate”, by Valérie Clouard & Alain Bonneville Table 1 : Compilation of radiometric datings of seamounts and islands on the Pacific plate from 1645 samples. Data are sorted by chain, and further by island or seamount from south to north as this represents the general trend of Pacific plate motion since 120 Ma. Final sorting is according to the method used and the author. An average age, calculated by weighting each age by the inverse of its variance, is given when several ages have been determined for the same volcanic stage, by the same author, with the same method. In 2 this case the geographical coordinates are given only once for the line. The error associated with a mean age is calculated as 1/S(1/si ). TF denotes total fusion, IH step-heating or incremental heating, S age spectrum, I isochron, w whole rock, s single mineral. Long. E Latitude Age Error Average Average Name (island, seamount, Island or seamount Method Reference (degrees) (degrees) (Ma) (Ma) age (Ma) error plateau or sample) chain (Ma) 219.80 -29.00 0.00 0.00 Macdonald Austral observation (Johnson and Malahoff, 1971) 0.14 0.04 0.21 0.03 Macdonald Austral K/Ar (Diraison, 1991) 0.17 0.05 Macdonald Austral K/Ar (Diraison, 1991) 0.24 0.07 Macdonald Austral K/Ar (Diraison, 1991) 0.33 0.10 Macdonald Austral K/Ar (Diraison, 1991) 0.97 0.29 Macdonald Austral K/Ar (Diraison, 1991) 0.85 0.25 Macdonald Austral K/Ar (Diraison, 1991) 1.64 0.25 Macdonald Austral K/Ar (Diraison, 1991) 218.88 -28.76 29.21 0.61
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