Botanical and Geological Significance of Potassium-Argon Dates from the Juan Fernandez Islands

Details Botanical and Geological Significance of Potassium-Argon Dates from the Juan Fernandez Islands Botanical and Geological Significance of Potassium-Argon Dates from the Juan Fernandez Islands

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984sci...225...49s&link_type=abstract

Science, Volume 225, Issue 4657, pp. 49-51

Physics

4

Scientific paper

Potassium-argon dating of five basalts from the three main islands of the Juan Fernandez (or Robinson Crusoe) Islands of Chile in the southeastern Pacific gives ages of 1.01 ± 0.12 and 2.44 ± 0.14 million years for Masafuera 3.79 ± 0.20 and 4.23 ± 0.16 for Masatierra, and 5.8 ± 2.1 for Santa Clara. These ages are much younger than that of the underlying oceanic plate and are consistent with the origin of the island-seamount chain from a mantle hot spot beneath the eastward moving Nazca plate. The young age for the archipelago suggests that speciation within endemic genera has occurred within the past 4 to 5 million years. Endemic genera of apparently more ancient origins, such as Lactoris and Thyrsopteris, have apparently dispersed to the islands and survive refugially.

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