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Geological Society, London, Special Publications; 1995; v. 88; p. 235-248;
DOI: 10.1144/GSL.SP.1995.088.01.14
© 1995 Geological Society of London

Case Studies: Americas

Fold belt in the San Jorge Basin, Argentina: an example of tectonic inversion

J. F. Homovc, G. A. Conforto, P. A. Lafourcade & L. A. Chelotti

YPF S.A. Exploration, Comodoro Rivadavia, Chubut, Argentina

The San Jorge basin, located in southern Argentina, extends over the central part of the Patagonian region. The sedimentary fill of the basin is related to different rift and sag tectonic phases, from Triassic to Cretaceous. During Late Cretaceous-Early Tertiary, a marine transgression from the Atlantic developed; Tertiary sediments completed the basin fill. Late Tertiary compression produced a narrow structural belt that crops out in the San Bernardo Range and is present in the subsurface of the Santa Cruz and Chubut Provinces. The fold belt is 150 km long and 50 km wide. In its northern zone, it is formed by a series of anticlinal structures related to high angle reverse faults; in the southern part, these structures have similar characteristics, being associated with reverse faults which are the result of the reactivation of pre-existing normal faults. This report describes the structural features of a wide subsurface area of the fold belt, with high hydrocarbon potential. The development of the Neocomian sequence is used to establish the relationship between tectonism and sedimentation.