, Volume 26, Issue 1, pp 65–81 | Cite as

Ultrapotassic Volcanism of the Valagin Ridge, Kamchatka



New isotopic-geochemical data are reported on the Late Cretaceous–Paleocene ultrapotassic volcanic rocks of the alkaline–ultrabasic complex of the Valagin Ridge, Eastern Kamchatka. The high Mg, low Ca and Al contents at high K/Na ratios in these rocks make them similar to the Mediterranean-type lamproites and ultrapotassic rocks. The low contents of high-field strength (HFSE) and heavy rare-earth (HREE) elements relative to the MORB composition, and the low Sr and high Nd isotopic ratios indicate the formation of their primary melts from a depleted mantle source. The enrichment of the ultrapotassic rocks in the large-ion lithophile elements (LILE) can be explained by the fluid influx in melts during melting of subsided oceanic crust.


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© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Geological Institute, Russian Academy of SciencesMoscowRussia
  2. 2.Institute of Precambrian Geology and GeochronologyRussian Academy of SciencesSt. PetersburgRussia

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