Abstract
The magnetovariational response of a 2D electrical structure in the southeastern part of the Parnaiba basin, north-northeast Brazil, has been inverted in terms of laterally variable sheet current. The resulting inverted current distribution helps to visualize the overall basement configuration as a graben-horst-graben structure or alternatively indicates the presence of a resistive intrusive within a broad graben infilled with conductive sediments. Carbon bearing sediments are suggested as an alternative to hydrated sediments to account for the high conductivity of the mapped anomalies. Heating effects associated with the Cretaceous magmatic activity may be responsible in producing carbon through the pyrolysis of the hydrocarbon-saturated Paleozoic sediments or through the coalification of terrestrial plants.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
