Drainage network development in the upper Anadyr drainage basin

Abstract

Five segments of valleys without streams (wind gaps) are discovered within the area under consideration. Alluvium under the valleys floor was dated palynologically and four stages of the drainage system development were reconstructed during the Late Pleistocene-Holocene. The drainage network changes are established to tend as a whole to a formation of a new large stream and water divide of NW direction. The cause of the changes is upwarping of the structure buried under volcanic rocks of the Okhotsk-Chukchi volcanogenic belt.