A Holocene Sedimentary Record from Lake Silvana, Se Brazil: Evidence for Paleoclimatic Changes from Mineral, Trace-Metal, and Pollen Data
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) Saulo Rodrigues-Filho, German Muller,
Publisher: Springer-Verlag Telos
ISBN: 3540662057
Edition: Paperback; 1999-12-15
Summary:
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 10000 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.
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