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25, No.1 Ofioliti
Volume 25, Issue No. 1, 2000
OF THE VALAGINSKY RIDGE, EASTERN KAMCHATKA, AND THEIR PETROLOGICAL SIGNIFICANCE
V.A. Seliverstov*, A.B. Osipenk* and E.G. Sidorov*
*Institute of Volcanology, Russian Academy of Sciences, Petropavlovsk-Kamchatsky, Russia
ABSTRACT
New data are reported on the gologic setting, structural relationships, and composition of calc-silicate metasomatites (rodingites) associated with alkali-ultramafic volcanics, which are exposed in the northern part of the Valaginsky Ridge, Eastern Kamchatka. Original conclusions were drawn regarding the general regularities of mineral composition of these high-temperature rodingites. Based on the new obtained data, the authors proposed the palingenic-metasomatic petrological model, which extends the thermodynamic range of rodingite genesis. The universal mechanism of calcium metasomatism in mafic-ultramafic complexes of different formational types is demionstrated
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