Anderson P., Minyuk P., Lozhkin A., Cherepanova M., Borkhodoev Vl., Finney B.
В журнале Journal of Paleolimnology
Год: 2015 Том: 54 Номер: 4 Страницы: 379-393
Diatom, rock magnetic, geochemical, and lithological studies of a sediment core from Paramushir Island (northern Kuril Archipelago) trace environmenal shifts from bog to salt-water lagoon to freshwater lake over the past 10,000 14C BP. Organic-rich mesic landscapes dominated the southern island until *8200 14C BP. Transgression of the Sea of Okhotsk onto the island began sometime after 8200 14C BP, resulting in the formation ?rst of a salty (*8200–5700 14C BP)then a brackish (*5700–5200 14C BP) lagoon. With lowering of sea level after 5200 14C BP, a freshwater lake formed, which has remained to the present day.This history parallels regional trends in the Russian Far East, where maximum sea levels occurred between *8000 and 4600 14C BP,peaking at *6400 14C BP.Sandy levels within the lake core suggest four intervals of aeolian activity (*4900–4800 14C BP; 4300–3800 14C BP; 3200–3000 14C BP; 1900–900 14C BP),perhaps related to drier than present climates. Palynological data indicate a dominance of Pinus pumila-Duschekia kamtschatica shrub tundra in the lowlands *8200–5800 14C BP, marking the Holocene thermal maximum. This vegetation contrasts to modern, which established *5800 14C BP and is a mix of coastal meadow, Betula–Salix low shrub tundra, and scattered Pinus and Duschekia thickets. The palynological record shows little response to mid-to-late Holocene climatic ?uctuations except for a decrease in Pinus shrubs perhaps caused by changes in snow cover and/or summer temperature during the Little Ice Age.
