Abstract
A comparative analysis of the Late Cretaceous-Paleocene volcanism was conducted for four areas of Kamchatka: the Pravyi Tolbachik-Levaya Shchapina-Adrianovka interlfuve (the northern part of the Tumrok Range), the area south of the Ipuin River and Mt. Khrebtovaya (the northern Valaginsky Range), the area of Mt. Savul’ch (the upper reaches of the Kitil’gina River, northern Valaginsky Range), and the Kirganik-Levaya Kolpakova interfluve (the Sredinny Range). New petrochemical, geochemical, and isotopic data on the volcanic rocks from these areas are reported. The examination of this material, together with already published data on volcanic and plutonic rocks of similar composition and age, made it possible to establish the following: (1) the considered basaltoids are ascribed to the subalkali basalt-trachyandesite series with transition toward a meymechite-picrite rock association; (2) the alkali content in the rocks of the Valaginsky-Tumrok-Sredinny ranges increases simultaneously with the increase of the Rb content, while the contents of HFSE and radioactive elements decrease and then again increase. Two trends are identified in the Ybn-Cen diagram: a positive trend spanning most of the volcanic and plutonic rocks and a negative trend defined by the data points of the meymechite-picrite association. The first trend reflects the rock evolution during crystallization differentiation, while the second trend was produced by different degrees of melting of initial protolith. The possible geodynamic reconstructions of this volcanism are discussed as well.
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Original Russian Text © V.A. Koloskov, G.B. Flerov, D.V. Kovalenko, 2009, published in Tikhookeanskaya Geologiya, 2009, Vol. 28, No. 4, pp. 16–34.
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Koloskov, V.A., Flerov, G.B. & Kovalenko, D.V. Late Cretaceous-Paleocene magmatic complexes of central Kamchatka: Geological settings and compositional features. Russ. J. of Pac. Geol. 3, 319–337 (2009). https://doi.org/10.1134/S1819714009040022
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DOI: https://doi.org/10.1134/S1819714009040022