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Sedankinsky Dol (Sredinny Range, Kamchatka): K–Ar Isotopic Age of Volcanoes, Relationship of Volcanic and Glacial Relief Forms
Ist Teil von
Journal of volcanology and seismology, 2021-09, Vol.15 (5), p.314-322
Ort / Verlag
Moscow: Pleiades Publishing
Erscheinungsjahr
2021
Quelle
SpringerLink
Beschreibungen/Notizen
For the first time, a series of 10 isotopic K–Ar ages was obtained for the lava centers of the Sedankinsky Dol, located in the northern part of the Sredinny Range of Kamchatka. We show that volcanism in this area started at least in the Middle Pleistocene. For the pre-Holocene time, four stages of volcanism activation were distinguished (300–270, 180–160, 100–80, and between 50 and 12 ka BP), separated by significant periods of dormancy. The beginning of volcanic activity and the first supply of basic magmas to the Dol were apparently caused by regional reasons for the increase of endogenous activity. The obtained geochronological data cast doubt on either the age or the genesis of the moraine complexes of the first and second phases of the Late Pleistocene glaciation which were previously identified for this region. Analysis of lithological-petrographic and isotope-geochronological data indicates that about 100–80 ka a large avalanche descended from the near-watershed part of the ridge. The deposits of this avalanche were previously identified as “phase I moraine”. This event could have been triggered by a high-magnitude earthquake, preceding and/or accompanying a new stage of volcanism activation, when the earliest eruptions of olivine basalts were recorded.