By Saulo Rodrigues-Filho
Mineralogical-sedimentological and geochemical investigations together with pollen info of a 12.7-m-long dated sediment center from Lake Silvana, SE Brazil, let the reconstruction of the climatic historical past during the last 10,000 years. The lowermost part (I) displays a rough paleosol-type sediment with considerable plant particles and rootlets; pollen exhibits grassland plants. part II represents fine-grained lake sediments; pollen exhibits a savanna-like plants. part III represents a pollen-free, coarse-grained allogenic sediment deposited less than excessive transportation strength (increased precipitation). part IV, a greenish series with expanding C content material in the direction of the pinnacle, has a pollen spectrum of present-day plants (semideciduous forest). the several sediment sections convey a reference to erosional levels within the catchment of the lake, in keeping with mineralogy and geochemistry, that are a reaction to weather improvement.
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Extra resources for A Holocene Sedimentary Record from Lake Silvana, Se Brazil: Evidence for Paleoclimatic Changes from Mineral, Trace-Metal, and Pollen Data (Lecture Notes in Earth Sciences)
The oxycline in the 10-m deep Lake Carioca most closely resembles that of Lake Silvana. , 1994). In summer, pH values in Lake Silvana typically decrease across the zone of aerobic oxidation of organic matter and undergo a slight decrease in the anoxic zone. 2 at the bottom of the water column, while electrical conductivity varied from 79 to 155 gS/cm near the sediment-water interface (Fig. 18). 0 at the bottom, while electrical conductivity ranges from 20-30 to 50-70 gS/cm downwards. Electrical conductivity, alkalinity and concentrations of NH4+ and ZCO2 are very well correlated in the water column of Lake Carioca and other lakes studied by Tundisi et al.
Stratigraphy, zones palynological I to IVA data as described and grain in the text. 8 m. The sedimentary sequence consists of alternate thin layers (ca. 5 mm) of well stratified clayey and silty-sandy reddish sediments. Grain-size distribution points to the deposition of this unit during a period characterized by high transportation energy, as reflected by an increase in both the sandy fraction (average of 18%) and the 20-63 lam fraction (average of 42%). Seasonal fluctuations in the rainfall regime are likely to explain the formation of alternate clayey and silty-sandy thin layers.
5 .... 9 .... 33 . . 5 .... 1 . . 52 30 EG1/ColI. 0 . 22 10 28 30 75 143 EG1/ColI. 1 . 5 32 73,5 113 EG 1/Co11. 2 . 15 8 26 14 35 75 EG1/ColI. 4 o - ° . -- not measured A light increase in Fe, Ti and Cr concentrations were also observed in the colluvial unit relative to the B horizon. , 1979). Both the weathering degree and the composition of the parent rock are controlling the metal distribution within the weathering profile EG2, with the possible exception of Hg. The increase in gibbsite contents at the surface, in this case accompanied by elevated Hg concentrations, is a typical 55 picture of highly leached soils.