Atlantic Rifts and Continental Margins by Webster Mohriak, Manik Talwani

By Webster Mohriak, Manik Talwani

Published by way of the yank Geophysical Union as a part of the Geophysical Monograph Series.

Atlantic Rifts and Continental Margins fills a huge info hole within the seismic documentation of the passive margins of the Atlantic basin. New strategies have influenced fresh advancements in conceptual versions that combine geological and geophysical tools for reading deep water areas. specialists speak about a whole spectrum of themes, together with the effect of Precambrian compressional tectonics historical past at the formation of continental margins, local gravity and magnetics, exact seismic interpretation, and state-of-the-art options and strategies. This quantity could be of curiosity either to educational geoscientists operating in basin research and to these engaged in petroleum exploration.Content:

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26 FROM COLLISION TO EXTENSION •l'kcto no•Nedit• + + + + + entary Evol•ttion +•-•*'•2- +_ + " + + + + I Fernandesand Chang, 1992) attributedthe formation of the Taubat6basinto archingof the lithosphereand crust, resultingin small riffs. ,-... -... ++ -. +++. -:•. :;:.. F•'=:::' ..... orogeniesin the Cenozoic. Tectono-magrnaticepisodes datedaround100 - 90 Ma in the Andes(Mirano orogeny) have correspondingtectono-magmaticepisodes in the Santosand Camposbasins(Mizusaki and Mohriak, 1992). The Eocene magmatism,widespreadalong several segmentsof the Brazilian EasternAtlantic margin, is geochronologically coincident with a major event in the Andes (Incaic orogeny,Bussel,1983).

The Moho deepensto about 31 km only toward the NE. In the whole basinthe tendencytoward regionalisostasyis probablyprovidedby the massive, high-density intrusionsin the lower crust, althougha stronglocalBouguergravityhighin themiddleof the basinshowsthat isostasyis not complete. Various are ratherthin in the NGB [MeissnerandRabbel,1999]. This subbasins developed, someshort-time inversions interrupted may be an effectof a ratherpuremafic lowercrust,wherethe the general subsidence,and signsof extensionremained originallyhot mafic magmascouldnot developa differential small [DEKORP-BASIN ResearchGroup,1998, 1999].

2). , 1985). The stratigraphyof the basinis known only superficially,becauseof the lack of deepexploratory boreholes. The maximum sedimentarythicknessin HEILBRON ET AL. 26 FROM COLLISION TO EXTENSION •l'kcto no•Nedit• + + + + + entary Evol•ttion +•-•*'•2- +_ + " + + + + I Fernandesand Chang, 1992) attributedthe formation of the Taubat6basinto archingof the lithosphereand crust, resultingin small riffs. ,-... -... ++ -. +++. -:•. :;:.. F•'=:::' ..... orogeniesin the Cenozoic. Tectono-magrnaticepisodes datedaround100 - 90 Ma in the Andes(Mirano orogeny) have correspondingtectono-magmaticepisodes in the Santosand Camposbasins(Mizusaki and Mohriak, 1992).

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