| UDC 551. 351 (571.651) |
|
Mid-Pleistocene Interglacials and Glaciation Stages in the Continuous Pollen Record from Lake Elʹgygytgyn (Central Chukotka) |
|
| © 2018 E. Yu. Nedorubova |
|
| North-East Interdisciplinary Scientific Research Institute n. a. Shilo FEB RAS, Magadan |
|
| E-mail:
|
|
| The crater Lake El’gygytgyn resulted from a meteorite impact that occurred 3.6 million years ago within the Arctic Circle in Chukotka, at 67°30’ N, 172°05’ E; . In its sediments, 5 palynologic zones were distinguished within the interval between 374 and 130 thousand yrs. BP, referred to as marine isotope stages 10, 9, 8, 7, and 6. A continuous pollen chronicle from this interval of plant history permits to consider stages 9 and 7 interglacials. Interglacial climatic conditions were favorable for the development of larch-birch forests. Herbaceous tundra dominated in the colder substages, being replaced by forest-tundra communities in the valleys of the Anadyr Plateau, surrounding the lake. The change in phytocenosis is clearly manifested at the boundary of glacial and interglacial stages in the successive replacement of grassy tundra communities by birch-shrub and birch-alder-larch forest/tundra. |
|
| Keywords: palynology, pollen zones, vegetation, climate, isotope stage. |
| Full text [In Russian] |
|