The Sarengrad loess section is located on the south bank of the Danube River in the easternmost part of Croatia. The published lithostratigraphical results including grain size, total organic content, calcium carbonate content and luminescence dating results (Galovic et al., 2009 ; submitted) were complemented by geochemical (content of major elements and trace elements and acidity) (Figs. 1 & 2) andmagnetic susceptibility (e) studies (Fig. 3). Throughout the section, four palaeosols are intercalated in the loess. The oldest, hydromorphic one is covered by laminated alluvial sediments and loess. The second palaeosol is a well-developed dark brown soil, and the other two palaeosols are brownish, less developed and intercalated in loess. Geochemical characteristics of investigated palaeosols explained both the main characteristics and degree of pedogenesis. Major and trace element content is higher in palaeosol than in loess horizons. Palaeosol horizons could be clearly extracted based on weathering coefficients, such as Ba/Sr, and (CaO+Na2O+MgO+K2O)/Al2O3 (Fig. 2). An IRSL age of 86.6±8.6 and 55.3±5.5 ka indicates that most of the middle pleniglacial, pleniglacial and late glacial records are missing at the Sarengrad section (Fig. 3). Earlier research work done on loess chronostratigraphy by means of a luminescence dating approach highlighted the main characteristics of palaeosols and degrees of their pedogenesis in several sections in Eastern Croatia (Galovic et al., 2009). However, in this study the focus is shifted to a single loess/palaeosol section in order to provide sedimentological and pedological support to previously investigated archives of Quaternary environmental and climate change on the narrower scale (Galovic et al., 2010). Correlation of the geochemical and magnetic susceptibility data and distribution of trace elements with depth in particular, showed that these parameters are primarily the function of pedogenesis. Abundance of investigated trace elements increases with degree of pedogenetic development giving rise to their accumulation in palaeosols rather than in BC- and loess horizons. The highest concentrations are related to argillic and hydromorphic palaeosol horizons.
Chronology of Cauvery Delta Sediments from Shallow Subsurface Cores Using Elevated-Temperature Post-IR IRSL Dating of Feldspar We present the results of luminescence dating of sediments from two cores from the Cauvery Delta in south-east India. Since all natural quartz OSL signals except one sample were in saturation, the elevated temperature post-IR IRSL protocol for K-feldspar was applied to establish a chronology. Internal dose rates of K-feldspar grains were calculated from the measured internal content of potassium, uranium, thorium and rubidium in the bulk of K-feldspar grains using solution ICP-OES and ICP-MS analysis. A substantial scatter in single-aliquot D e values was observed which is most probably due to the effect of incomplete bleaching of fluvial sediments before burial. A minimum age model was applied to extract possible depositional ages. The study revealed that except an upper layer of Holocene sediments (< 5m), the majority of the upper ~50m of Cauvery delta sediments were deposited between marine isotope stage MIS-5 and MIS-10 or older. The feldspar luminescence ages also indicate the existence of a period of non deposition or erosion in the upper part of the cores.
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