By Dr. Saulo Rodrigues-Filho, Prof. Dr. Dr. h.c. mult. German Müller (auth.)
Mineralogical-sedimentological and geochemical investigations together with pollen info of a 12.7-m-long dated sediment middle from Lake Silvana, SE Brazil, let the reconstruction of the climatic background 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 crops. part II represents fine-grained lake sediments; pollen shows a savanna-like crops. 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 head, has a pollen spectrum of present-day plants (semideciduous forest). different sediment sections convey a reference to erosional levels within the catchment of the lake, in line with mineralogy and geochemistry, that are a reaction to weather development.
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Additional resources for A Holocene Sedimentary Record from Lake Silvana, SE Brazil: Evidence for Paleoclimatic Changes from Mineral, Trace-Metal and Pollen Data
Paleoenvironmental zones I to IVA as described in the text. e, ,~0"" 0 ~r~ns,z, C(org) (,/,) >20pm(%) 15 0 ° ~ - P b (pg/g) 1000 i ~ Cu (pg/g) 100 0 ~i ~ . . . - . . . C r (pglg) 100 0 Ti (%) 1200 ~ 17n ~ ~ 300 ~ = i ~ ~=- , 39o ; "== i ~ --- ~-- 420 ~' ~ ~ ~ P-"--' 480 ~. ~ ! , 550 ~" ~ ~ 1,5 ..... ~ , ~ ............ ~ ---J A oE~0 6T0 " " 700 ," J~ 740 ~' =,, m m m m i 77o; u ~800~ 830 b, 8~o ~ , i ~ i ~ ' ' m B i J 930 " 1140 i ' m m 1230 . . . . 4 Summary diagram of chemical stratigraphy and grain size >20 Hm.
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.
Gibbsite, however, may occur either in red ferralitic soils (Curi and Franzmeier, 1984) or in beige soils (Irion, 1984). 1 Sampling One sediment core and two soil profiles were collected in Lake Sitvana and its catchment. 7 m long and was collected using a piston corer capable to reach great depths with excellent recovery rates. This has been assessed through the length of each core section after extrusion, which indicated negligible loss of material. A platform was built over two small boats and fixed with three 12-m-long Eucalyptus trunks (Fig.
A Holocene Sedimentary Record from Lake Silvana, SE Brazil: Evidence for Paleoclimatic Changes from Mineral, Trace-Metal and Pollen Data by Dr. Saulo Rodrigues-Filho, Prof. Dr. Dr. h.c. mult. German Müller (auth.)