Abstract

INTROCASO, A. Significative isostatic uncompensation in the Colorado Basin (Argentine Republic). Rev. Asoc. Geol. Argent. [online]. 2003, vol.58, n.3, pp.474-478. ISSN 0004-4822.

Isostatic balance on the deepest zone of the Colorado sedimentary basin was analysed using gravity anomalies. Isostatic anomalies (AI) reach + 90 mGal, pointing out: (1) notable overcompensation today and (2) a tendency of the basin of significantly subsiding in the future to recover masses equilibrium. A value for characterising no isostatic compensation was obtained by an inversion model from Bouguer anomalies (ABc) corrected for sedimentary effects. This model was compared with a perfectly compensated stretching model, that was assumed from deep seismic data (antiroot) and from direct faulting (obtained from seismic lines) on the basement supporting the sedimentary filling.

Keywords : Isostatic state; Future crustal mobility.

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