Fechar
Metadados

@Article{PadilhaVitoAntuPádu:2015:ImThCr,
               author = "Padilha, Antonio Lopes and Vitorello, {\'{\I}}caro and Antunes, 
                         C{\'a}ssio Esp{\'{\i}}ndola and P{\'a}dua, Marcelo Banik de",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "Imaging three-dimensional crustal conductivity structures 
                         reflecting continental flood basalt effects hidden beneath thick 
                         intracratonic sedimentary basin",
              journal = "Journal of Geophysical Research",
                 year = "2015",
               volume = "120",
               number = "7",
                pages = "4702--4719",
                month = "July",
             keywords = "continental flood basalts, electromagnetic induction, large 
                         igneous provinces, Paran{\'a} Basin, three-dimensional 
                         conductivity structure.",
             abstract = "A large-scale array of long-period magnetic data and a 
                         deep-probing magnetotelluric profile were recorded in the 
                         intracratonic Paran{\'a} sedimentary basin in central eastern 
                         South America, which presents a thick and extensive 
                         sedimentary-magmatic sequence that allows its basement to be 
                         investigated only by indirect methods. Integration of the results 
                         from both methods showed that the crust beneath the basin presents 
                         several quasi-linear highly conductive channeled zones with 
                         limited lateral extent, in coincidence with some of the main 
                         tectonic structures recognized at the surface, and a moderate but 
                         pervasive lithosphere conductivity enhancement beneath its central 
                         part. Upward movement of CO2-bearing volatiles and magmas 
                         precipitating highly conducting mineral phases along discrete 
                         subvertical fault zones that served as feeder conduits for Early 
                         Cretaceous voluminous continental flood basalts was a likely 
                         process responsible for the localized conductivity enhancements. 
                         Correlation between some of the linear conductive zones and 
                         elongated magnetic anomalies and between the maximum depth 
                         occurrence of most of these conductive anomalies and the Curie 
                         depth at which crustal rocks lose their magnetism gives strong 
                         support to interconnected iron oxides (especially magnetite) and 
                         iron sulfides (such as pyrrhotite) as the main conductive sources. 
                         The moderate bulk conductivity increase in the crust and upper 
                         mantle beneath the central part of the basin is unexpected for a 
                         postulated cratonic basement and is tentatively associated with 
                         impregnation of the lithosphere by conducting minerals related 
                         either to widespread tectonic events in the Ordovician or Late 
                         Precambrian or to dispersed magmatic residues of an Early 
                         Cretaceous magma differentiation contaminating the entire 
                         lithosphere.",
                  doi = "10.1002/2014JB011657",
                  url = "http://dx.doi.org/10.1002/2014JB011657",
                 issn = "0148-0227 and 2156-2202",
             language = "en",
        urlaccessdate = "04 dez. 2020"
}


Fechar