@Article{RossettiBerZanCreHay:2012:ImOrSa,
               author = "Rossetti, Dilce de F{\'a}tima and Bertani, T. C. and Zani, Hiran 
                         and Cremon, {\'E}dipo Henrique and Hayakawa, E. H.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Late Quaternary sedimentary dynamics in Western Amazonia: 
                         implications for the origin of savanna/forest contrasts",
              journal = "Geomorphology",
                 year = "2012",
               volume = "177-17",
                pages = "74--92",
                month = "Dec.",
                 note = "{Setores de Atividade: Outras atividades de servi{\c{c}}os.}",
             keywords = "• Amazonia, • Open vegetation–forest contrasts, •Paleomorphology, 
                         Depositional system, Late Quaternarycontraste vegetacional, 
                         savana, sedimentologia, Amaz{\^o}nia, sensoriamento remoto, 
                         Quatern{\'a}rio.",
             abstract = "This work investigated the evolution of sedimentary environments 
                         during the latest Quaternary and their influence on the 
                         paradoxical occurrence of open vegetation patches in sharp contact 
                         with the Amazonian forest. The approach integrated pre-existing 
                         geological and floristic data from lowlands in the Brazilian 
                         Amazonia, with remote sensing imagery including multispectral 
                         optical images (TM, ETM+, and ASTER), Phased Array L-band 
                         Synthetic Aperture Radar (PALSAR), InSAR C-band SRTM-DEMs, and 
                         high resolution images obtained from Google Earth. The detection 
                         of an abundance of paleomorphologies provided evidence of a 
                         scenario in which constant environmental shifts were linked to the 
                         evolution of fluvial and megafan depositional systems. In all 
                         studied areas, the open vegetation patches are not random, but 
                         associated with sedimentary deposits representative of 
                         environments either deactivated during the Holocene or presently 
                         in the process of deactivation. Sedimentary evolution would have 
                         determined the distribution of wetlands and terra firme in many 
                         areas of the Amazonian lowlands, and would have a major impact on 
                         the development of open vegetated patches within the modern 
                         rainforest. Subsiding areas were filled up with megafan deposits, 
                         and many fluvial tributaries were rearranged on the landscape. The 
                         close relationship between vegetation and the physical environment 
                         suggests that sedimentary history related to the evolution of 
                         depositional settings during the latest Quaternary played a major 
                         role in the distribution of flooded and non-flooded areas of the 
                         Amazonian lowlands, with a direct impact on the distribution of 
                         modern floristic patterns. As the depositional sites were 
                         abandoned and their sedimentary deposits were exposed to the 
                         surface, they became sites suitable for vegetation growth, first 
                         of herbaceous species and then of forest. Although climate 
                         fluctuations might have been involved, fault reactivation appears 
                         to have been the main cause of changes in depositional dynamics 
                         through time, a process that had an immediate effect on the 
                         development of large open vegetation patches intermingled with the 
                         Amazonian rainforest.",
                  doi = "10.1016/j.geomorph.2012.07.015",
                  url = "http://dx.doi.org/10.1016/j.geomorph.2012.07.015",
                 issn = "0169-555X",
                label = "lattes: 0307721738107549 1 RossettiBerCreHay:2012:ImOrSa",
             language = "en",
           targetfile = "1-s2.0-S0169555X12003479-dilce.pdf",
        urlaccessdate = "30 abr. 2024"
}