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

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.

Sommario

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

Dettagli sul prodotto

• Autori: German Müller, Saul Rodrigues-Filho, Saulo Rodrigues-Filho
• Editore: Springer, Berlin
• Lingue: Inglese
• Formato: Tascabile
• Pubblicazione: 01.01.1999
• EAN: 9783540662051
• ISBN: 978-3-540-66205-1
• Pagine: 98
• Peso: 254 g
• Illustrazioni: XII, 98 p. 51 illus.
• Serie: Lecture Notes in Earth Sciences; Lecture Notes in Earth Sciences
• Categoria: Scienze naturali, medicina, informatica, tecnica > Geoscienze > Geologia