Sedimentological and geochemical study of lake deposits-a review

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This article gives an overview of recent lacustrine studies from a paleoenvironmental point of view, focusing on organic and inorganic geochemical studies to lacustrine deposits. Conclusions of selected studies are; 1. carbon isotopic composition of organic matters reflects climatic changes, 2. carbon isotopic composition of land-plants (C3, C4) is controlled by paleoclimate around lakes, 3. C/N ratio of organic matters reflects origin of the organic matters, 4. oxygen isotopic composition of primary carbonates is a measure of salinity and water balance of lake, and 5. integrated studies to combine microfossil analysis and geochemical analysis improve the reliability of conclusions. Lacustrine studies are expected to provide valuable information in reconstructing paleo-environments in relation with human societies and activities and predicting near future environmental change of the Earth's surface.
日本堆積学会の論文