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o L1 NEA MENTO SISMO-TECTONICO DE CABO FR IO GEO RG ROB ERT SA DOWS KI' e CO RIO LANO DE M. D IAS NETO' ABS TRACT The Cabo Frio lineament was defined as a co ntinental expression of a ridge offset Fo rmed-du ri ng the separatio n of the co ntinents. It coi ncides with a line o f seismic act ivit y, with several alkalincs of Seno nian and Paleocene age, and with disruptive structures. Historical and recent ear thquakes were located by intensity and instrumental data. The alkaline lineament co incides "vith a Scno mian-Paleocenc plate trajectory obtained thro ugh back rotation of the co ntinents alo ng the pole s defined by Ladd (1975). Geoc hrono logica lly th e a lkalines show a trend of lo wer ages to wards the cast. The se features indica te a possible existence of a ho t spo t type mechanism in this area associated with the major mesozo ic thermal Pont a Grcss ac-Mossamedes swell.