%0 Journal Article %T Modelo gravim¨¦trico-magn¨¦tico do gr¨¢ben de Paranagu¨¢-PR, Brasil %A Castro %A Lu¨ªs Gustavo de %A Ferreira %A Francisco J.F. %A Angulo %A Rodolfo Jos¨¦ %J Revista Brasileira de Geof¨ªsica %D 2008 %I Scientific Electronic Library Online %R 10.1590/S0102-261X2008000300002 %X we study the paranagu¨¢ graben, which is part of the cenozoic rift system of southeastern brazil. specifically, it is considered a gravimetric-magnetic model of the top of the precambrian basement under the cenozoic sediments of the paran¨¢ state coastal plain. we aim to identify the main structures of the paranagu¨¢ graben. we also evaluate the thickness of the sedimentary section and the mesozoic basic intrusions in the basement. we use a regional geophysical survey that extends for more than 55 km of gravimetric profiles with 500 m of spacing between the stations and about 45 km of magnetic profiles with spacing of 25 m. the geophysical profiles were located between paranagu¨¢ bay and the sa¨ª-gua£¿¨² river outlet, both in the context of the central region of the ponta grossa arch (pga). data were collected along ne-sw acquisition lines, perpendicularly to the principal trend of the pga. we present a 2-d geologic model using on gravity and magnetic data. we incorporate prior knowledge about the basement depth provided by boreholes. the identification of gravity high was related to a basement uplifting (canoas structural high). contiguous gravity lows had been interpreted as structural lows and called albatroz and shangri-l¨¢, whose maximum thickness of the sediments is 130 m. the magnetic model allowed to estimate the thicknesses of the basic dykes and to calculate an average crustal extension of 27% related to 45 km of the magnetic profiles. %K ponta grossa arch %K paran¨¢ state coast %K paranagu¨¢ graben %K gravimetric-magnetic model %K crustal extension. %U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0102-261X2008000300002&lng=en&nrm=iso&tlng=en