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UDC 551.21:551.33

https://doi.org/10.26516/2541-9641.2026.2.137

EDN: BSHJEU

Middle Eocene-Early Miocene Volcanism in the Tkapravayam Area of the Kinkil Volcanic Belt, Northwestern Kamchatka: Suprasubduction Geochemical Signatures of Volcanic Rock Sources

N.F. Krikun¹, S.V. Rasskazov^2,3, Т.А. Yasnygina²

¹Kamchatgeologiya, Petropavlovsk-Kamchatsky, Russia

²Institute of the Earth's Crust SB RAS, Irkutsk, Russia

³Irkutsk State University, Irkutsk, Russia

Abstract. From K–Ar dating at the Tkapravayam area of the Kinkil Volcanic Belt in Northwestern Kamchatka, the age has been determined to be between 50 and 20 Ma, subdivided into intervals of 50–31 and 26–20 Ma. Younger rocks ranging in age from 12.8 to 6.7 Ma have also been detected. The rocks are dominated by andesites and basaltic andesites, with subordinate basaltic andesites, dacites, and rhyolites. An antidromic sequence of volcanic eruptions, ranging from dacites and andesites to basaltic andesites, has been identified in rocks of the late Oligocene to early Miocene age range. A similar antidromic sequence was previously defined in the lower (Shaman) Middle Eocene part of the Kinkil volcanic complex. The entire rock spectrum is characterized by suprasubduction geochemical signatures – low TiO₂ content, Nb–Ta depletion, and a shift of rock compositions from the oceanic basalt direction toward the continental margin source area in the Th/Yb – Ta/Yb diagram. Two age intervals of the Kinkil Volcanic Belt may indicate its whole suprasubduction activity or its main activity in the Middle Eocene – Early Oligocene with localization of the antidromic sequence in the Late Oligocene – Early Miocene.

Keywords: Kamchatka, basaltic andesite, andesite, rhyolite, suprasubduction source, Eocene, Oligocene, Miocene, K–Ar ages, trace elements

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Крикун Наталья Федоровна,

Камчатгеология, Петропавловск-Камчатский,

начальник геологической партии,

Rasskazov Sergei Vasilevich,

doctor of geological and mineralogical sciences, professor,

664025, Irkutsk, Lenin st., 3,

Irkutsk State University, Faculty of Geology,

Head of Dynamic Geology Char,

664033, Irkutsk, Lermontov st., 128,

Institute of the Earth's Crust SB RAS,

Head of the Laboratory for Isotopic and Geochronological Studies,

tel.: (3952) 51–16–59,

еmail: rassk@crust.irk.ru

 

Yasnygina Tatyana Alexandrovna,

candidate of geological and mineralogical sciences,

664033, Irkutsk, st. Lermontova, 128,

Institute of the Earth's Crust SB RAS,

Senior Researcher,

еmail: ty@crust.irk.ru

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