Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 47155 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ New K-Ar Ages for Basalts from Franz Josef Land New K-Ar Ages for Basalts from Franz Josef Land Grachev A F Grachev A F Arakelyantz M M Arakelyantz M M Lebedev V A Lebedev V A Musatov E E Musatov E E Stolbov N M Stolbov N M Schmidt United Institute of Physics of the Earth, Russian Academy of Sciences ru Schmidt United Institute of Physics of the Earth, Russian Academy of Sciences ru Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS, Moscow, Russia ru Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS, Moscow, Russia ru Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS, Moscow, Russia ru Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS, Moscow, Russia ru All-Russian Research Institute of Oceanology, Sankt-Petersburg, Russia ru All-Russian Research Institute of Oceanology, Sankt-Petersburg, Russia ru All-Russian Research Institute of Oceanology, Sankt-Petersburg, Russia ru All-Russian Research Institute of Oceanology, Sankt-Petersburg, Russia ru 3 1 79 82 11 11 2021 https://rjes.ru/en/nauka/article/47155/view

New K-Ar age determinations on basalt samples from three drillholes and outcrops on Franz Josef Land suggest that flood volcanism throughout the archipelago fits in a very narrow age interval 116 5Ma. For 95% of the samples we studied, age scatter is within analytical uncertainty. New data on basaltic bulk-rock, trace element, and REE compositions point to mantle plume affinity for the Early Cretaceous magmatism on Franz Josef Land, which preceded the onset of seafloor spreading in the Canada Basin.

New K-Ar age determinations on basalt samples from three drillholes and outcrops on Franz Josef Land suggest that flood volcanism throughout the archipelago fits in a very narrow age interval 116 5Ma. For 95% of the samples we studied, age scatter is within analytical uncertainty. New data on basaltic bulk-rock, trace element, and REE compositions point to mantle plume affinity for the Early Cretaceous magmatism on Franz Josef Land, which preceded the onset of seafloor spreading in the Canada Basin.

 Franz Josef Land flood volcanism K-Ar dating. Franz Josef Land flood volcanism K-Ar dating.

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