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    STUDIA GEOLOGIA - Ediţia nr.1 din 2007  
         
  Articol:   δ18O OF CELLULOSE ORGANIC FRACTION COMBINED WITH δ 18O OF CALCITE AND δ 18O OF DIATOMS IN LAKE SEDIMENTS: A NEW TOOL FOR PALEOCLIMATE RECONSTRUCTIONS ON CONTINENTS?.

Autori:  MONIKA KLISCH, K. ROZANSKI, TOMASZ GOSLAR, T.W.D. EDWARDS, A. SHEMESH.
 
       
         
  Rezumat:  Lake sediments are among the most valuable climatic archives on continents. Studies aimed at reconstructions of continental climates based on lake sediments are usually of interdisciplinary character, comprising physico-chemical, biological and isotopic tools. Isotope methods are considered as particularly useful (Leng et al., 2006). δ18O isotope composition of bulk carbonate fraction of lake sediments was often used to infer relative changes of lake water temperature in the past, while δ 18O of cellulose organic fraction served as proxy for δ 18O of lake water. δ 18O of diatoms was tested as a proxy for temperature or isotopic composition of lake water (Leng and Barker, 2006). Laminated sediments of Lake Gosciaz located in central Poland have been a subject of extensive interdisciplinary investigations aimed at reconstructing environmental and climatic changes in central Europe during the Lateglacial and the Holocene (Ralska- Jasiewiczowa et al., 1998). A recent study carried out on these sediments was aimed at a systematic comparison of the carbonate and diatom "isotope thermometers" in a lacustrine environment. Five absolutely dated sections of the Gosciaz lake sediment column, comprising 100-150 years each and ranging from Lateglacial to the Late Holocene, were selected for this study. Each section was split into 10-year samples. The following isotope parameters were analysed in each sample: δ 13C and δ 15N of bulk organic fraction, δ 18O of cellulose organic fraction, δ 18O and δ 13C of authigenic calcite and δ 18O of diatoms (if available).  
         
     
         
         
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