@Article{RossettiVale:2021:HaAmLo,
               author = "Rossetti, Dilce de F{\'a}tima and Valeriano, M{\'a}rcio de 
                         Morisson",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Have the Amazonian lowlands evidenced late Pleistocene-Holocene 
                         compression?",
              journal = "Journal of South American Earth Sciences",
                 year = "2021",
               volume = "107",
                pages = "e103044",
                month = "Apr.",
             keywords = "Digital elevation model, Relief, Folds, Strike-slip fault, 
                         Pleistocene-Holocene, Amazonia.",
             abstract = "Neotectonic reactivation has been increasingly documented in many 
                         areas of the Amazonian lowlands, but the evidence has been only 
                         for extensional structures. This work investigates a large-scale 
                         sinusoidal-shaped morphology (Ssm) in a relief dominated by Late 
                         Quaternary deposits in the north of the Solim{\~o}es Basin. The 
                         digital elevation model (DEM) of the shuttle radar topography 
                         mission (SRTM) was used as a basis to characterize this structure 
                         and improve the knowledge of its geological context. The Ssm is a 
                         Z-shaped sinusoid with a wavelength of approximately 135 km, 
                         formed by two merged asymmetrical curves. The north curve has an 
                         amplitude of 70 km and a core topographically lower and 
                         geologically younger than the limbs, while the south curve has an 
                         amplitude of 90 km and a core with older geological units and 
                         higher relief than the limbs. A main NE-trending morphostructural 
                         lineament has horizontally displaced the rocks near the axial 
                         plane in the north curve. Several NW-trending lineaments that 
                         laterally displaced the modern and ancient valley segments are 
                         also described. Our morphological data led to hypothesize that the 
                         Ssm north and south curves record a plunged syncline and an 
                         anticline, respectively, and that the laterally displaced 
                         lineaments are strike-slip faults. Although this type of fault has 
                         already been described in the region, the propagation of folds in 
                         the Pleistocene-Holocene deposits is a new finding. Assuming this 
                         model, the SW- to WSW-plunging folds would suggest a main NW- to 
                         WNW-oriented maximum horizontal compression, activated 
                         contemporaneously or shortly after the Pleistocene-Holocene 
                         deposition. This proposed orientation for the stress field is 
                         interesting because it would reveal a rotation, in this region, of 
                         the main E-W stress field recorded for South America. On the other 
                         hand, the suggested NW- to WNW-oriented compression is compatible 
                         with the models based on earthquake focal mechanisms comparing 
                         data from Brazil and the sub-Andean region. As such, the present 
                         work can bring new insights to discuss the impact of the late 
                         stage displacement of the South American plate in an intraplate 
                         region away from the passive margin, although the contribution of 
                         local stresses must be also considered.",
                  doi = "10.1016/j.jsames.2020.103044",
                  url = "http://dx.doi.org/10.1016/j.jsames.2020.103044",
                 issn = "0895-9811",
             language = "en",
           targetfile = "rossetti_have.pdf",
        urlaccessdate = "03 maio 2024"
}