Open AccessEvolution of a paleolake on Russian Island (Sea of Japan) in middle-late Holocene: record of sea-level oscillations, extreme storms and tsunami
Author(s) -
Т. А. Гребенникова,
N. G. Razjigaeva,
L. А. Ganzey,
К. С. Ганзей,
Х. А. Арсланов,
Ф. Е. Максимов,
A. Yu. Petrov,
А. А. Харламов
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/438/1/012009
Subject(s) - holocene , bay , oceanography , geology , monsoon , marine transgression , storm , salinity , water level , sea level , physical geography , climatology , geography , geomorphology , cartography , structural basin
The diatom algae from sediments of a paleolake serve as records of changes to environments over the last 7500 cal yr. The lagoon lake formed when the sea level approximately corresponded to the present-day position. Evolution of the paleolake was controlled by sea-level oscillations and humidity changes. Eight stages have been distinguished. During a dry episode in 7330–7090 cal yr BP the lake size decreased. The salinity reached maximal values at the Holocene transgression peak. Three stages of a higher salinity are recognized (6750–6500, 6080–5830, 5420–5090 cal yr BP). A severe flood occurred in 6080–6000 cal yr BP. The brackish-water lake existed in ∼5090 cal yr BP and the freshwater lake in ∼4090 cal yr BP. A prolonged phase of decreasing humidity, associated with a weakening of summer monsoons, led to a drop in sedimentation rates in ∼3510 cal yr BP. Peat accumulation started at the Little Ice Age. The lake was transformed into a swamp during drop in precipitations in ∼270 cal yr BP. Presence of marine diatoms typical in bay and deep-water forms are evidence of influence of extreme storms and tsunami. The age of the paleotsunami coincides well with the regional data.