A Holocene Sedimentary Record from Lake Silvana, SE Brazil

1. Front Matter

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2. Abstract

   Pages 1-3

3. Introduction

   Pages 5-26

4. Methods

   Pages 27-31

5. Results

   Pages 33-61

6. Discussion

   Pages 63-72

7. Conclusions

   Pages 73-74

8. Back Matter

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Mineralogical-sedimentological and geochemical investigations in combination with pollen data of a 12.7-m-long dated sediment core from Lake Silvana, SE Brazil, permit the reconstruction of the climatic history over the past 10,000 years. The lowermost section (I) reflects a coarse paleosol-type sediment with abundant plant debris and rootlets; pollen indicates grassland vegetation. Section II represents fine-grained lake sediments; pollen indicates a savanna-like vegetation. Section III represents a pollen-free, coarse-grained allogenic sediment deposited under high transportation energy (increased precipitation). Section IV, a greenish sequence with increasing C content towards the top, has a pollen spectrum of present-day vegetation (semideciduous forest). The different sediment sections show a connection with erosional phases in the catchment of the lake, based on mineralogy and geochemistry, which are a response to climate development.

• Brasilien
• Brazil
• Erosion
• Holozan
• Klima
• Pollenanalyse
• Precipitation
• Seesedimente
• climate
• geochemistry
• holocene
• lake
• pollen analysis
• sediments
• vegetation

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