@Article{CastroRossPess:2010:Fa&#&#,
               author = "Castro, Darcil{\'e}a Ferreira and Rossetti, Dilce de F{\'a}tima 
                         and Pessenda, Luiz C. R.",
          affiliation = "Universidade de S{\~a}o Paulo-USP, Instituto de Geoci{\^e}ncias 
                         – Programa de Geotect{\^o}nica e Geoqu{\'{\i}}mica and Rua do 
                         Lago, 562 Cidade Universit{\'a}ria 05508-080 S{\~a}o Paulo, SP, 
                         Brazil and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         Universidade de S{\~a}o Paulo, Laborat{\'o}rio de 14C, Av. 
                         Centen{\'a}rio 303, 13416000 Piracicaba, SP, Brazil",
                title = "Facies, \δ13C, \δ15N and C/N analyses in a late 
                         Quaternary compound estuarine fill, northern Brazil and relation 
                         to sea level",
              journal = "Marine Geology",
                 year = "2010",
               volume = "274",
                pages = "135--150",
                 note = "{Setores de Atividade: Outras atividades de servi{\c{c}}os.}",
             keywords = "is{\'o}topos, Quatern{\'a}rio, paleoambiente, Ilha do 
                         Maraj{\'o},estuarine setting, sedimentary facies, isotopes, late 
                         Quaternary, relative sea-level.",
             abstract = "The present work integrates sedimentary facies, 14C dating, 
                         \δ13C, \δ15N, and C/N with geologic and geomorphologic 
                         data available from literature. The aim was to characterize the 
                         depositional settings of a late Quaternary estuary in northeastern 
                         Maraj{\'o} Island and analyze its evolution within the context of 
                         relative sea level fluctuations. The data derive from four 
                         continuous cores along a proximal-to-distal transect of a 
                         paleoestuary, previously recognized using remote sensing 
                         information. Fifteen sediment samples recorded ages ranging from 
                         42,580 ± 1430 to 3184 ± 37 14C yr B.P. Facies analysis indicated 
                         fine- to coarse-grained sands with parallel lamination or cross 
                         stratification, massive or laminated muds and heterolithic 
                         deposits. \δ13C (\− 28.1 to \− 19.7, mean = 
                         \− 23.0), \δ15N (+ 14.8 to + 4.7, mean = + 9.2) and 
                         C/N (14.5 to 1.5, mean = 7.9) indicate mostly marine and 
                         freshwater phytoplankton sources for the organic matter. The 
                         results confirm a large late Quaternary paleoestuary in 
                         northeastern Maraj{\'o} Island. The distribution of \δ13C, 
                         \δ15N, and C/N, together with facies associations, led to 
                         identify depositional settings related to fluvial channel, 
                         floodplain, tidal channel/tidal flat, central basin, tidal delta, 
                         and tidal inlet/sand barrier. These deposits are consistent with a 
                         wave-dominated estuary. Variations in stratigraphy and 
                         geochemistry are controlled by changes in relative sea level, 
                         revealing a main transgression from an undetermined time around 
                         42,000 14C yr B.P. and 29,340 (± 200) 14C yr B.P., which is 
                         synchronous to the overall drop in sea level after the last 
                         interglacial. Following this period, and probably until 9110 ± 37 
                         14C yr B.P., i.e., during a time interval encompassing two glacial 
                         episodes including the Last Glacial and the Younger Dryas, there 
                         was a pronounced drop in sea level, recorded by the development of 
                         a major erosional discontinuity due to valley re-incision. Sea 
                         level rose again until 5464 ± 40 14C yr B.P, just before the main 
                         worldwide mid-Holocene transgressive peak. Mid to late Holocene 
                         coastal progradation ended the Maraj{\'o} paleoestuarine history, 
                         and promoted the establishment of continental conditions 
                         throughout the island. The divergence comparing the Maraj{\'o} 
                         sea level behavior with the eustatic curve allows hypothesizing 
                         that post-rifting tectonics along the Brazilian Equatorial margin 
                         influenced the sedimentary evolution of the studied paleoestuary. 
                         Considering that sedimentary facies in estuarine settings are 
                         highly variable both laterally and vertically, the present 
                         integration of facies with isotope and elemental analyses was 
                         crucial to provide a more precise interpretation of the Late 
                         Pleistocene and Holocene Maraj{\'o} paleoestuary, and analyze its 
                         sea level history within the eustatic and tectonic context. .",
                 issn = "0025-3227",
                label = "lattes: 0307721738107549 2 CastroRossPess:2010:Fa\&a\&a",
             language = "en",
           targetfile = "castro.pdf",
        urlaccessdate = "16 jun. 2024"
}