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  • 1
    Electronic Resource
    Electronic Resource
    Comparative varve counting and magnetic properties of the 8400-yr sequence of an annually laminated sediment in Lake Valkiajärvi, Central Finland (1999)
    Springer
    Journal of paleolimnology 22 (1999), S. 335-348 
    Details
    ISSN: 1573-0417
    Keywords: Valkiajärvi ; varved lake sediment ; meromictic lake ; environmental magnetism ; pollen stratigraphy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Two varve counts made nearly 20 yrs apart and by different authors in the small and well sheltered meromictic lake of Valkiajärvi were compared with a view to establishing how similar, or otherwise, these two independent varve chronologies might be. The results were significant, the difference between the two varve counts being less than 2% for most of the sediment length, even though the average varve thickness was only 0.3 mm. The continuous and essentially uniform varve record - so far the longest in Finland - covers 8400 yrs and could be applied for accurate dating of palaeoenvironmental indicators in the sediment. As an example, we present a varve-dated pollen diagram for Lake Valkiajärvi. In addition, some magnetic parameters (susceptibility, ARM, SIRM) were measured on the sediment sequence to support the stratigraphic division and correlation of the cores, and to outline the development of the basin since the last deglaciation. Magnetic variables reflected mainly the variation in minerogenic material in the sediment, and were therefore related to changes in the catchment. The magnetic parameters also showed a drastic change some 6000 yrs ago, the reason for which, unfortunately, is still not fully understood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008064613031
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  • 2
    Electronic Resource
    Electronic Resource
    Late- and postglacial history of lakes of the Karelian Isthmus (1996)
    Springer
    Hydrobiologia 322 (1996), S. 199-204 
    Details
    ISSN: 1573-5117
    Keywords: Lake sediments ; lake history ; Karelian Isthmus ; Vuoksi River
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Late Pleistocene and Holocene history of five lakes in the central part of Karelian Isthmus, south of the present Vuoksi River, are described on the basis of sediment stratigraphical investigations. Two of the Lakes, Michurinskoe (94 m a.s.l.) and Uzornoe (55 m a.s.l.) are situated in an upland area that remained dry land after the deglaciation even during the early high water stages of the Baltic Sea (Baltic Ice Lake until c. 10 000 yr BP and Ancylus Lake 9500–8800 BP). The low-lying central parts of the Isthmus were flooded by the outflow of Lake Ladoga that took place across this area until the formation of Neva River, c. 3 100 yr BP, and further by the waters of River Vuoksi that started flowing into the area from the NW c. 5000 yr BP as a new outlet of Lake Saimaa. The basins of the lakes Krasnoe and Vishnevskoe (both 16 m a.s.l.) became isolated when River Neva was formed and Lake Ladoga sank to its present level. Lake Rakovoe (12 m a.s.l.) was on the level of River Vuoksi up until the mid-19th century, when water level in the central stretch of the river was artificially lowered. Each of the lakes has been variously affected by hydrological and climatic changes and consequences of human activities, e.g. eutrophication due to intensified land use. As a consequence to artificial lowering, done in order to gain field and meadowland, the large, shallow Lake Rakovoe has been largely overgrown by macrophytic vegetation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00031828
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  • 3
    Electronic Resource
    Electronic Resource
    Shoreline displacement of Lake Ladoga — new data from Kilpolansaari (1996)
    Springer
    Hydrobiologia 322 (1996), S. 205-215 
    Details
    ISSN: 1573-5117
    Keywords: Lake sediments ; diatom flora ; 14C ; Holocene ; River Neva ; Lake Ladoga
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dating of sediments sampled from small lakes in the Kilpolansaari region, in the NW part of Lake Ladoga, indicate that the River Neva, which is the present outlet of Lake Ladoga, originated at 3,100 radiocarbon years BP This is in agreement with some earlier estimations but no consensus concerning the age of the River Neva has previously been reached. New diatom data provide information concerning salinity and nutrient conditions in northern Lake Ladoga prior to the formation of the River Neva, when the Litorina Sea occupied the Baltic basin and approached the level of the ancient Lake Ladoga. Some slightly brackish water diatom species may indicate occasional saline water incursions into the Ladoga basin but, on the other hand, slightly brackish water species also occur in the present Lake Ladoga.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00031829
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