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Evidence for Lake Formation as a Response to an Inferred Holocene Climatic Transition in Brazil

Published online by Cambridge University Press:  20 January 2017

Saulo Rodrigues-Filho ,
Hermann Behling ,
George Irion  and
German Müller
Saulo Rodrigues-Filho
Affiliation:
Centro de Tecnologia Mineral CETEM/MCT, Cidade Universitária, 21941.590 Rio de Janeiro, Brazil, E-mail: srodrigues@cetem.gov.br
Hermann Behling
Affiliation:
Center for Tropical Marine Ecology, Fahrenheitstrasse 1, 28359 Bremen, Germany
George Irion
Affiliation:
Forschungsinstitut Senckenberg, Schleusenstrasse 37, 26382 Wilhemshaven, Germany
German Müller
Affiliation:
Institute for Environmental Geochemistry, University of Heidelberg, INF 236, 69120 Heidelberg, Germany
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Abstract

Geochemical, mineralogical, and palynological records from a Holocene sediment core 12.7 m long from Lake Silvana, southeastern Brazil, served to identify the source of detrital sediments within catchment soils. The lake basin was first flooded in the early Holocene (9400 14C yr B.P.), when a gibbsite-rich B soil horizon started to accumulate. Four distinct hydrologic phases are consistent with vegetational changes indicated by pollen data. Phases of slope instability (colluviation) and low lake level correspond to pollen-free intervals and point to a severe retreat of the vegetation cover. The rapid sedimentation of slope-wash sediments alternating with alluvial sediments appears to have formed a tributary fan 7.8 m thick that dammed the Lake Silvana Basin 8500 14C yr B.P., probably as a response to a drastic increase in precipitation rates.

Keywords

sedimentary recordgeochemistrypaleoclimateholocenesoutheastern brazil
Type
Research Article
Information
Quaternary Research , Volume 57 , Issue 1 , January 2002 , pp. 131 - 137
Copyright
University of Washington

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