Biogeochemical specifics of sapropel formation in Cisbaikalian undrained lakes (exemplified by Lake Ochki) |
| |
| Institution: | 1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk 630090, Russia;3. Moscow State University, Leninskie Gory 1, Moscow, 119991, Russia;4. A.P. Vinogradov Institute of Geochemistry, ul. Favorskogo 1a, Irkutsk, 664033, Russia;1. GEOPOLAR, Institute of Geography, University of Bremen, Celsiusstraße FVG, 28359 Bremen, Germany;2. former Department of Geology, Heinrich Heine University Düsseldorf, Moorenstraße 5, 40225 Düsseldorf, Germany;3. Department of Geochronology and Isotope Hydrology, Leibniz Institute for Applied Geophysics (LIAG), Stilleweg 2, 30655 Hannover, Germany;1. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, PR China;2. Environmental and Ocean Sciences, University of San Diego, 5998 Alcala Park, San Diego, CA 92110, USA;3. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, PR China;4. National Climate Center, China Meteorological Administration, Beijing 100081, PR China;5. Chinese Academy of Sciences, Center for Excellence in Tibetan Plateau Earth System Sciences, Beijing 100101, PR China;1. Laboratory for Conservation Research, Collection Centre, Swiss National Museum, Lindenmoosstrasse 1, 8910 Affoltern am Albis, Switzerland;2. Swiss Light Source SLS, Paul Scherrer Institute, WLGA 221, 5232 Villigen, Switzerland;3. Building Department Canton of Zurich, Office for Spatial Development, Archaeology, Stettbachstrasse 7, 8600 Dübendorf, Switzerland |
| |
| Abstract: | The biogeochemistry of organic lacustrine sediments (sapropels) has been poorly studied in Siberia. In this paper we show the specifics of sapropel formation caused by low pH and mineralization of water by the example of Lake Ochki in Cisbaikalia. The main sources of organic matter are zoo- and phytoplankton, which concentrate mostly basic chemical elements and also some alkaline, alkali-earth, and chalcophile elements and move them to the sediment. The calculated enrichment factors (EF) have shown that the lake plankton is strongly enriched with phosphorus and chalcophile elements. The calculations have also revealed a great contribution of the plankton to the elemental composition of sapropel (Mebio, %): P (-100), Cd (57), Br (45), Hg (40), Se and Na (30), Zn (23), K (21), and Ca (15). Elements are rather uniformly distributed throughout the 3.2 m thick sapropel layer. Lithophile elements (Al, Sc, Ti, Y, Zr, Nb) and LREE are mostly from a terrigenous source. The high contents of mobile elements (Cd, Sb, Sn, Pb, Zn) in the upper part of sapropel are probably due to anthropogenic factors. The high Cu and Zn contents in some sapropel layers are probably related to the inflow of deep-level groundwaters, and the elevated contents of Hg, Cd, and Sb might have been caused by forest fires. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
