Varves and mass-movement deposits record distinctly different sedimentation dynamics since the late glacial (Lake Szurpiły, northeastern Poland)
Małgorzata Kinder , Wojciech Tylmann , Michał Rzeszewski , Bernd Zolitschka
AbstractThe sedimentological and geochemical characteristics of sediments from Lake Szurpiły (northeastern Poland) can be used as a record of mass movement and climate dynamics since the Allerød. Late-glacial sediments suggest enhanced runoff conditions in the catchment after the retreat of the Scandinavian Ice Sheet, while Holocene varved sediments are interrupted by mass-movement deposits (MMDs). We identified 85 thin (<10 cm) MMDs (type 1) that consist of autochthonous material and frequently occur during the Atlantic period. Mobilization of littoral zone and slope sediments caused redeposition in the deepest part of the lake and was likely related to climatic conditions. In contrasting, one sedimentary unit (>1-m-thick MMD type 2) consists of auto- and allochthonous material and represents multistage processes, including erosion and deformation of underlying varved sediments, rapid deposition of clastic material, and redeposition of previously eroded varved sediments. Seismic activity or permafrost degradation was responsible for the deposition of MMD type 2. Furthermore, varve-thickness variability suggests Gleissberg and Suess solar cycles before 850 BC, when human impact was limited. Additionally, 22 and 11 yr sunspot cycles are recognized in light/dark laminae-thickness ratios and reflect influences of solar irradiance on lacustrine productivity.
|Journal series||Quaternary Research, ISSN 0033-5894, e-ISSN 1096-0287, (N/A 100 pkt)|
|Publication size in sheets||0.7|
|Keywords in Polish||jeziorne osady warwowe, osady ruchów masowych, spływy, późny glacjał, holocen, cykl plam słonecznych, trzęsienia ziemi, wpływ człowieka|
|Keywords in English||varved lake sediments, mass-movement deposits, slumps, late glacial, holocene, sunspot cycles, earthquakes, human impact|
|ASJC Classification||; ;|
|Score||= 100.0, 20-02-2020, ArticleFromJournal|
|Publication indicators||= 0; : 2017 = 1.019; : 2018 = 2.133 (2) - 2018=2.45 (5)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.