Fechar
Metadados

@Article{GandiniRossGuimGoes:2017:MiWaEs,
               author = "Gandini, Rosana and Rossetti, Dilce de F{\'a}tima and Guimaraes 
                         Netto, Renata and Goes, Ana Maria",
          affiliation = "{Univesidade de S{\~a}o Paulo (USP)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Universidade dos Sinos 
                         (UNISINOS)} and {Universidade de S{\~a}o Paulo (USP)}",
                title = "A Miocene wave-dominated estuarine system in the Para{\'{\i}}ba 
                         Basin, northeastern Brazil",
              journal = "Journal of South American Earth Sciences",
                 year = "2017",
               volume = "79",
                pages = "267--280",
                month = "Nov.",
             keywords = "MioceneBarreiras FormationPara{\'{\i}}ba BasinEstuarySea 
                         level.",
             abstract = "A number of publications have documented the effect of the Miocene 
                         transgression on several coasts of the world. However, this event 
                         is incompletely documented along the Brazilian margin, despite the 
                         existence of an impressive record of Miocene deposits exposed 
                         mostly as several coastal cliffs along more than 5000 km of 
                         distance. The transgressive nature of Miocene deposits, so far 
                         recognized only in a few localities of northeastern Brazil, needs 
                         to be amplified in order to better characterize the impact of the 
                         Miocene transgression in eastern South America. In this work, we 
                         provide facies analysis of early/middle Miocene strata exposed in 
                         the Para{\'{\i}}ba Basin, northeastern Brazil, aiming 
                         reconstruct the depositional paleoenvironments and analyze their 
                         evolution within the context of relative sea-level fluctuations 
                         data. The results revealed deposits characterized by several 
                         features that were related to the action of tidal currents, such 
                         as alternating thicker/thinner forest packages, abundant 
                         reactivation surfaces, mud drapes and oppositely-dipping 
                         (herringbone) cross sets. These sedimentary structures were 
                         associated with an ichnological assemblage indicative of 
                         marine-influenced and brackish water, best represented by 
                         Ophiomorpha, Planolites-Palaeophycus-Thalassinoides and 
                         Thallassinoides-Planolites-Palaeophycus ichnofabrics. 
                         Sedimentation occurred in environments consisting of estuarine 
                         channel, estuarine central basin, tidal inlet/tidal channel, tidal 
                         delta/washover, tidal flat/shoal and foreshore, which were related 
                         to an estuarine setting, at least in part of a wave-dominated 
                         type. Analysis of facies stratal patterns led to suggest that the 
                         estuarine deposits of the Para{\'{\i}}ba Basin reflect a rise in 
                         relative sea level probably during the transgressive and/or 
                         highstand stage of a depositional sequence formed directly 
                         overlying Cretaceous rocks. This rise can be correlated with the 
                         worldwide early/mid Miocene marine transgression. However, while 
                         the eustatic sea level remained rising through the middle Miocene, 
                         the estuarine sedimentation in the study area was cut off, being 
                         replaced by a regional unconformity marked by lateritic paleosols. 
                         Thus, a relative sea-level fall is recorded in the 
                         Para{\'{\i}}ba Basin while the eustatic sea level remained 
                         rising through the middle Miocene, before its fall in the 
                         Tortonian. It follows that other factors, such as tectonics, is 
                         proposed to explain the mid-Miocene fall in sea level along the 
                         Para{\'{\i}}ba coast, while the eustatic sea level was rising.",
                  doi = "10.1016/j.jsames.2017.08.007",
                  url = "http://dx.doi.org/10.1016/j.jsames.2017.08.007",
                 issn = "0895-9811",
             language = "en",
           targetfile = "gandini_miocene.pdf",
        urlaccessdate = "30 nov. 2020"
}


Fechar