Resumen
A new shallow multichannel seismic survey was carried out in the Llancanelo Lake region (Southern
Mendoza Province, Argentina), in order to complete and extend previously surveyed seismic sections. The new seismic
data allowed to double the already existing data. The obtained information was correlated with seismic and stratigraphic
data from the industry. In this way it was possible to depict the major Neogene-Quaternary sedimentary-volcanic
sequences and the regional evolution of a tectonic-volcanic basin located in a key region at the eastern foot of the Andes
cordillera. This research is settled on early studies that comprised seismic works reaching depths of 600-700 m as well
as geoelectric and electromagnetic surveys reaching the uppermost 80-100 m of the sequences. The obtained results
indicate the presence of three major sedimentary units separated by conspicuous seismic horizons SR1, SR2 and SR3,
respectively considered as representing the late Mesozoic transition from marine to continental deposition, the beginning
of the Cenozoic basaltic volcanism, and the change from dominantly sedimentary to dominantly volcanic processes at
the base of the Quaternary. The resulting stratigraphic scheme reveals increasing volcanic (basaltic layers) intercalations
with depth that accommodate to the geometry of the depocenter.