First Data on 10Be in Recent Volcanics of the Kurile-Kamchatka Island Arc System in Relation to Sediment Subduction

Concentrations of ¹⁰ Be were measured in 23 lava samples representing historically and ¹⁴C dated eruptions of major Kurile and Kamchatka volcanoes. We report 2.2–7.9 · 10⁶ at/g of ¹⁰Be for Kuriles and in most cases less than 1.2 · 10⁶ at/g for Kamchatka. Thus Kurile segment of the Kurile-Kamchatka arc system features the same isotopic pattern as the Aleutians and some continental arcs like Central America and the Andes. The obtained results confirm previously drawn conclusion that the scale of sediment incorporation in Kurile magmas is not large thought the process itself is quite real.