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Bulletin de la Societe Geologique de France; March 2008; v. 179; no. 2; p. 117-128; DOI: 10.2113/gssgfbull.179.2.117
© 2008 Societe Geologique de France
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Cenozoic gravity tectonics in the northern Gulf of Mexico induced by crustal extension. A new interpretation of multichannel seismic data

Claude Rangin1, Xavier Le Pichon1, Nicolas Flotté2 and Laurent Husson3

1 CNRS-UMR 6635, CEREGE, Chaire de Géodynamique du Collège de France, BP 80, Europôle de l’Arbois, 13545 Aix en Provence cedex, France.
2 AREVA T&D, Tour Areva, 1 place de la Coupole, 92084 Paris la Défense, France
3 Géosciences Rennes, CNRS-UMR 6118, Univ. Rennes 1, Campus de Beaulieu, 35042 Rennes cedex, France.

The Gulf of Mexico margin in Texas is one of the most impressive examples of starved passive margin gravity collapse systems. Growth faults developed upslope and are compensated down slope by toe folding and thrusting. On the basis of new multi-channel seismic data with high penetration (down to 11 s-twtt) we present evidences for deep crustal extension and rifting that have enhanced superficial sliding. This hypothesis is supported by a significant heat flow anomaly and crustal thinning independently deduced from gravity data. This Cenozoic rifting episode is tectonically linked to left lateral motion along the Rio Bravo fault, a reactivated branch of the Texas lineament.

Key Words: Gravity tectonics • Cenozoic rifting • Gulf of Mexico • Texas • Northeast Mexico




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