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Abstract

AAPG Bulletin, V. 89, No. 8 (August 2005), P. 1081-1089.

Copyright copy2005. The American Association of Petroleum Geologists. All rights reserved.

DOI:10.1306/03310503064

Salt tectonics driven by sediment progradation: Part II—Radial Previous HitspreadingNext Hit of sedimentary lobes prograding above salt

V. Gaullier,1 B. C. Vendeville2

1Laboratoire d'Etudes des GeacuteoEnvironnements Marins (LEGEM), Universiteacute de Perpignan Via Domitia, 52, avenue Paul Alduy, 66860 Perpignan, France; [email protected]
2Bureau of Economic Geology, University of Texas at Austin, Austin, Texas; present address: Universiteacute de Lille 1, UFR Sciences de la Terre, UMR 8110, Citeacute Scientifique, Bat. SN5, Villeneuve d'Ascq F-59655, France; [email protected]

ABSTRACT

Experimental models indicate that sedimentary lobes deposited above mobile evaporites deform gravitationally by Previous HitspreadingNext Hit outward radially. Radial Previous HitspreadingNext Hit forms both concentric and radial families of thin-skinned grabens that are then pierced diapirically by salt ridges. The overburden blocks located between the ridges become subsiding depocenters. Later, continued Previous HitspreadingNext Hit after depletion of the salt layer forces salt ridges and diapirs to fall, forming rapidly subsiding bathymetric lows that channel or trap younger sediments. Previous HitSpreadingTop causes large horizontal overburden movements whose distribution and orientation change when the locus of regional deposition shifts.

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