Ichinsky region



Soil-pyroclastic sequence 12 km NE from the summit of Ichinsky volcano. Tephra layers from bottom to top: 1) Fall and surge units presumably associated with the summit caldera; 2) yellowish marker ash layer from Khangar volcano (KHG, 6900 14C yrs B.P.); 3) two cinder fall units from cinder cones S.Cherpuk (lower) and N.Cherpuk (upper); 6) pyroclastic surge unit associated with a flank eruption of Ichinsky. Even in case tephra layers 5 and 6 were measured in peat bogs with high rate of peat accumulation, no interval was documented between them. The eruptions of the two cinder cones (S. and N.Cherpuk) and a flank eruption of Ichinsky were likely caused by a single dyke, which came to the surface to form S.Cherpuk cone, but also intruded two silicic chambers that triggered eruptions from N.Cherpuk and Ichinsky itself.






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