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A holocene sedimentary record from lake Silvana, SE Brazil: evidence for paleoclimatic changes from mineral, trace-metal, and pollen data [Libro electrónico] / autors: Saulo Rodrigues-Filho, German Müller

Por: Rodrigues-Filho, Saulo [autor/a].
Müller, German [autor/a].
Tipo de material: Libro en línea Libro en línea Series Editor: New York, New York, United States: Springer, c1999Descripción: xii, 96 páginas : ilustraciones mapas ; 24 centímetros.ISBN: 3540662057; 9783540662051 (Print); 9783540486794 (Online).Tema(s): Cuaternario | Paleoclimatología | Geología estratigráfica | GeologíaDescriptor(es) geográficos: Brasil | Silvana LakeNota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso Nota de bibliografía: Incluye bibliografía: páginas 75-85 Número de sistema: 55792Contenidos:Mostrar Resumen:
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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.

Recurso en línea: http://link.springer.com/openurl?genre=book&isbn=978-3-540-66205-1
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Incluye bibliografía: páginas 75-85

1. Abstract.. 2. Introduction.. 3. Methods.. 4. Results.. 5. Discussion.. 6. Conclusions.. Appendix

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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. eng

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