Holocene paleoenvironmental reconstruction in the Eastern Amazonian Basin: Comprido Lake |
| |
| Affiliation: | 1. Departamento de Geoquímica, Universidade Federal Fluminense (UFF), Niterói, Brazil;2. IRD (Institut de Recherche pour le Développement), UR 234, GET, Bondy, France;3. IRD-LOCEAN, Bondy, France;1. Department of Chemistry, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Rio de Janeiro, RJ, 22451-900, Brazil;2. Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology (MIT), Cambridge, MA, 02142, United States;3. Department of Earth Sciences, Geological Institute, ETH Zürich, 8092, Zürich, Switzerland;4. Scottish Universities Environmental Research Centre, University of Glasgow, Scotland, UK;1. Department of Palynology and Climate Dynamics, Albrecht-von-Haller-Institute for Plant Sciences, University of Göttingen, Untere Karspüle 2, 37073 Göttingen, Germany;2. Faculty of Oceanography, Federal University of Pará, Rua Augusto Corrêa, no 1, Guama, 66075-110 Belém, PA, Brazil;1. Division of Earth and Ocean Sciences, Duke University, Durham, NC 27708, USA;2. Yachay Tech University, School of Geological Sciences and Engineering, San Miguel de Urcuqui, Hacienda San Jose, Imbabura, Ecuador;3. Department of Earth and Atmospheric Sciences, University of Nebraska – Lincoln, Lincoln, NE 68588-0340, USA;4. School of Biological Sciences, University of Nebraska – Lincoln, Lincoln, NE 68588-0340, USA;1. Instituto Oceanográfico, Universidade de São Paulo, São Paulo, Brazil;2. Instituto de Geociências, Universidade de Brasília, Brasília, Brazil;3. Department of Environmental Science, William Paterson University, Wayne, NJ, USA;4. Centre ESCER (Etude et la Simulation du Climat à l’Echelle Regionale) and GEOTOP (Research Center on the Dynamics of the Earth System), Department of Earth and Atmospheric Sciences, University of Quebec in Montreal, Montreal, QC, Canada;1. Institute of Geosciences, University of São Paulo, São Paulo, 05508-080, Brazil;2. Department of Atmospheric and Environmental Sciences, University at Albany, Albany, 12222, USA;3. Departamento de Geoquímica, Universidade Federal Fluminense, Niterói, 24020-141, Brazil;4. Instituto Geofísico del Perú, Lima, 15012, Peru;5. Institut des Sciences de la Terre d’Orléans, Orléans, 45100, France;6. Asian School of the Environment and Earth Observatory of Singapore, Nanyang Technological University, 639798 Singapore;7. Institute of Geoscience University of Campinas, 13083-855, Brazil;8. Instituto de Astronomia, Geofísica e Ciências Atmosféricas, University of São Paulo, São Paulo, 05508-090, Brazil;9. Center for Nuclear Energy in Agriculture (CENA), University of São Paulo, São Paulo, 13416-000, Brazil;10. Jackson School of Geosciences, University of Texas, Austin, 2305, USA;1. Departamento de Ciências Ambientais, Universidade Federal de São Paulo, Diadema, SP, Brazil;2. Instituto de Geociências, Universidade de São Paulo, São Paulo, SP, Brazil;3. Instituto Nacional de Pesquisas da Amazônia, Manaus, AM, Brazil;4. Instituto de Geociências, Universidade Estadual de Campinas, Campinas, SP, Brazil;5. Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, São Paulo, SP, Brazil;6. Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil;7. Instituto de Energia e Ambiente, Universidade de São Paulo, São Paulo, SP, Brazil;8. Department of Ornithology, American Museum of Natural History, New York, NY, USA |
| |
| Abstract: | Two sediment cores were studied from Comprido Lake, a black water floodplain lake located near Monte Alegre City, Eastern Amazonian Basin. The total organic carbon (TOC), nitrogen content (TN), δ13CTOC, sedimentary chlorophyll, diatom record and mineralogical composition revealed different hydrological and climatic regimes during the Holocene. Between 10,300 and 7800 cal yr BP, a dry climate was suggested by low values of TOC and chlorophyll derivatives concentrations that are related to the development of a C4 grasses on unflooded mud banks. A gap in sedimentation due to a complete dryness of the lake occurred between 7800 and 3000 cal years BP corresponding to the Middle Holocene dry phase. From 3000 cal years BP onwards a gradual increase of the TOC, chlorophyll derivatives and Aulacoseira sp. suggest an increase in the productivity and in water lake level due to the high water flow of the Amazon River and the catchment area as well. The Comprido Lake record indicates that the Late Holocene in this region was characterized by a wetter climate, as also observed in other records of the Amazonian Basin. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
