scholarly journals Paleogeographic reconstructions of the Northwest Karelia region evolution in the holocene based on the study of small lake sediments

2020 ◽  
pp. 101
Author(s):  
Татьяна Станиславовна Шелехова ◽  
Надежда Борисовна Лаврова ◽  
Tatyana Shelekhova ◽  
Nadezhda Lavrova
Keyword(s):  
Lake Sediments ◽  
Small Lake ◽  
The Holocene ◽  
Region Evolution

scholarly journals A late Quaternary record of eolian silt deposition in a maar lake, St. Michael Island, western Alaska

2003 ◽  
Vol 60 (1) ◽  
pp. 110-122 ◽  
Author(s):  
Daniel R. Muhs ◽  
Thomas A. Ager ◽  
Josh Been ◽  
J. Platt Bradbury ◽  
Walter E. Dean
Keyword(s):  
Lake Sediments ◽  
Late Quaternary ◽  
Geochemical Data ◽  
Unexpected Finding ◽  
The Holocene ◽  
Tundra Vegetation ◽  
Shrub Tundra ◽  
Loess Deposition ◽  
Maar Lake ◽  
Glacial Time

AbstractRecent stratigraphic studies in central Alaska have yielded the unexpected finding that there is little evidence for full-glacial (late Wisconsin) loess deposition. Because the loess record of western Alaska is poorly exposed and not well known, we analyzed a core from Zagoskin Lake, a maar lake on St. Michael Island, to determine if a full-glacial eolian record could be found in that region. Particle size and geochemical data indicate that the mineral fraction of the lake sediments is not derived from the local basalt and is probably eolian. Silt deposition took place from at least the latter part of the mid-Wisconsin interstadial period through the Holocene, based on radiocarbon dating. Based on the locations of likely loess sources, eolian silt in western Alaska was probably deflated by northeasterly winds from glaciofluvial sediments. If last-glacial winds that deposited loess were indeed from the northeast, this reconstruction is in conflict with a model-derived reconstruction of paleowinds in Alaska. Mass accumulation rates in Zagoskin Lake were higher during the Pleistocene than during the Holocene. In addition, more eolian sediment is recorded in the lake sediments than as loess on the adjacent landscape. The thinner loess record on land may be due to the sparse, herb tundra vegetation that dominated the landscape in full-glacial time. Herb tundra would have been an inefficient loess trap compared to forest or even shrub tundra due to its low roughness height. The lack of abundant, full-glacial, eolian silt deposition in the loess stratigraphic record of central Alaska may be due, therefore, to a mimimal ability of the landscape to trap loess, rather than a lack of available eolian sediment.

scholarly journals Quantified sensitivity of small lake sediments to record historic earthquakes: Implications for paleoseismology

2016 ◽  
Vol 121 (1) ◽  
pp. 2-16 ◽  
Author(s):  
Bruno Wilhelm ◽  
Jerome Nomade ◽  
Christian Crouzet ◽  
Camille Litty ◽  
Pierre Sabatier ◽  
...  
Keyword(s):  
Lake Sediments ◽  
Small Lake ◽  
Historic Earthquakes

Environmental changes of the Okhotsk-Kolyma divide from glacial lake sediments during the Holocene

2014 ◽  
Vol 8 (6) ◽  
pp. 464-474 ◽  
Author(s):  
P. M. Anderson ◽  
A. V. Lozhkin ◽  
P. S. Minuyk ◽  
A. Yu. Pakhomov
Keyword(s):  
Lake Sediments ◽  
Environmental Changes ◽  
Glacial Lake ◽  
The Holocene
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