A Holocene Sedimentary Record from Lake Silvana, SE Brazil: Evidence for Paleoclimatic Changes from Mineral, Trace-Metal and Pollen Data

by Saulo Rodrigues-Filho, German Mïller

Overview

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.

Product Details

ISBN-13:	9783540662051
Publisher:	Springer Berlin Heidelberg
Publication date:	10/18/1999
Series:	Lecture Notes in Earth Sciences , #88
Pages:	98
Product dimensions:	6.10(w) x 9.25(h) x 0.01(d)

Table of Contents

Abstract.- Methods.- Results.- Discussion.- Conclusions.