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Matsuda et al. 1984

Matsuda, J.-i., Notsu, K., Okano, J., Yaskawa, K. and Chungue, L. (1984). Geochemical implications from Sr isotopes and K-Ar age determinations for the Cook-Austral Islands chain. Tectonophysics 104(1-2): 145-154.

Sr isotopes and K-Ar ages were determined for volcanic rocks from three islands: Samoa, Rarotonga and Rurutu. Rurutu originated from the same 'hot spot' as Tubuai and Raivavae in the Cook-Austral chain as indicated by its 11 m.y. K-Ar age and ( (super 87) Sr/ (super 86) Sr) ratios. The ( (super 87) Sr/ (super 86) Sr) ratios for Rurutu, Tubuai and Raivavae lie in the restricted range 0.7026-0.7035. K-Ar ages of all volcanic rocks from Samoa and Rarotonga are all less than 4 m.y. and their ( (super 87) Sr/ (super 86) Sr) ratios are much higher than those in Rurutu, Tubuai and Raivavae. These findings suggest that Samoa and Rarotonga did not originate in a single hot spot for the Cook-Austral islands.--Modified journal abstract.

Keywords
absolute age; alkaline earth metals; Austral Islands; Cenozoic;, Cook Islands; dates; French Polynesia; geochemistry;, geochronology; hot spots; igneous rocks; island arcs; isotopes;, K/Ar; metals; Neogene; Oceania; plate tectonics; Polynesia;, Rarotonga; Rurutu; Samoa; Sr-87/Sr-86; stable isotopes; strontium;, Tertiary; volcanic rocks; volcanism; volcanology, 02D Isotope geochemistry; 03 Geochronology

Journal
Tectonophysics
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Elsevier Science
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