Mt Studies At Sedimentary Basin Of Sierras Pampeanas, Argentina

POMPOSIELLO, C.; OSELLA, A.,; FAVETTO, A.; SAINATO, C

Bahia

Congreso; 6th International Congress of the Brazilian Geophysical Society; 1999

MT data from profiles located over intermontane sedimentary basins of Sierras Pampeanas in North-West ofArgentina are analyzed through 2D inversion methods.These basins are very deep and have an important deposit of Tertiary sediments. Sediments contain Miocene torecent sequences of volcanic or continental detrial origin. Lithological variations occur from one intermontanebasin to another and they lie on a basement peneplain surface formed after the middle Paleozoic and frequentlyexhumed on the range.The resulting electrical models show sedimentary sequences with variable thickness (between 3 to 9 km). In allcases, a very conductive layer beneath the basement are detected.