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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
2005. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/03310503064
Salt tectonics driven by sediment progradation: Part II—Radial spreading of sedimentary lobes prograding above salt
V. Gaullier,1 B. C. Vendeville2
1Laboratoire d'Etudes des G
oEnvironnements Marins (LEGEM), Universit 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: Universit de Lille 1, UFR Sciences de la Terre, UMR 8110, Cit 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 spreading outward radially. Radial spreading 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 spreading after depletion of the salt layer forces salt ridges and diapirs to fall, forming rapidly subsiding bathymetric lows that channel or trap younger sediments. Spreading causes large horizontal overburden movements whose distribution and orientation change when the locus of regional deposition shifts.
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