f Aeromagnetic Evidence Of The Jurassic Rifting In The Northwestern Chubut Province, Argentina

The Jurassic sedimentary and volcanic sequence (Cañadón Asfalto Formation) of the northwestern Chubut province was started by an extensional regime. The precise location and geometry of a segment of the Jurassic rift, located in the Cerro Condor area, is distinguished as a narrow, north-south trending magnetic high rendered by the magnetiterich basalts that lie at the base of the sedimentary sequence, which, in turn, are displaced by east-west wrench faults evidenced by cross magnetic lineaments.