Abstract
This paper integrates geological histories, geochemistry (sulfur, nitrogen and organic carbon concentration) and geotechnical characteristics of Holocene deposits in the Izumo Plain, southwest Japan. Sulfur, nitrogen and organic carbon relationships in Holocene sediments have been used to characterize depositional environments, namely normal marine, brackish water, freshwater and euxinic sediments. The weight ratio of organic carbon to pyrite sulfur (C/S ratio) is useful for evaluating sedimentary environments. The geomorphological processes of Izumo Plain during the Holocene is also described. In addition, data regarding calcite (CaCo3) content within natural silt and clay sediments with depth and its effect on strength-deformation characteristics is presented.
We have attempted in this paper to demonstrate the importance of integrated studies of sedimentary environments and the usefulness of CNS elemental analysis. This study offers the designer a better understanding of mechanical behaviour of Holocene deposits, leading to refinement of existing construction technology.
