A Holocene Sedimentary Record from Lake Silvana, Se Brazil: - download pdf or read online
By Saulo Rodrigues-Filho
Mineralogical-sedimentological and geochemical investigations together with pollen information of a 12.7-m-long dated sediment middle from Lake Silvana, SE Brazil, enable the reconstruction of the climatic historical past over the last 10,000 years. The lowermost part (I) displays a rough paleosol-type sediment with ample plant particles and rootlets; pollen exhibits grassland crops. 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 power (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 crops (semideciduous forest). the various sediment sections exhibit 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 info 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)
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.
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3 Summary diagram of mineral stratigraphy and grain size distribution. 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 .
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) by Saulo Rodrigues-Filho