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Triangle zone and thrust wedge geometries related to evaporitic horizons (southern Pyrenees)

AuthorsSans, M.; Muñoz, J. A.; Vergés, Jaume CSIC ORCID
Issue Date1996
PublisherCanadian Society of Petroleum Geologists
CitationBullentin of Canadian Petroleum Geology 44: 375- 384 (1996)
AbstractThe South Pyrenean fold-and-thrust belt triangle zone developed above Eocene to Oligocene foreland evaporitic levels. The triangle zone, Oligocene in age, dies eastwards and westwards where the thrust front becomes south-directed and emergent. The eastern and western terminations of the triangle zone coincide with the edges of the evaporitic basins. The frontal thrust wedge defines abrupt changes in trend related to the depositional orientation of evaporitic limits: the NE-SW Suria Anticline, the NW-SE Sanaiija Anticline and the E-W Barbastro-Balaguer Anticline. The thrust wedge is formed commonly at pinch-outs of salt without changes in structural level, although in some localities the thrust wedge developed above a thrust ramp geometry. Constrained timing and structural evolution of the foreland fold-and-thrust belt indicate the existence of northern and previous thrust wedges located at the Oliana and Puig-reig anticlines and the Sanaiija Anticline that have been abandoned as deformation progressed southward. Frontal thrust wedges were incorporated into the triangle zone which widened as new frontal thrust wedges developed forwards, at the southern edge of higher evaporitic levels. The exposed example is well understood because of continuous field exposures, syntectonic sedimentary relationships and new, good quality seismic profiles as well as subsurface control from oil and potash exploration wells.
La zone triangulaire de la zone de plissement et de chevauchement des Pyrenees australes s'est developpee au-dessus des niveaux evaporitiques d'avant-pays d'age s'echelonnant de l'Eocene a I'Oligocene. La zone triangulaire, d'age Oligocene, s'estompe vers I'est et I'ouest la Oll le chevauchement frontal se dirige vers le sud et emerge. Les extremites est et ouest de la zone triangulaire correspondent aux marges des bassins evaporitiques. Le prisme a chevauchement frontal definit les changements abrupts de direction relatifs a I'orientation des depots des limites evaporitiques : l'anticlinal NE-SO Suria, I'anticlinal NO-SE Sanaiija et I'anticlinal E-O Barbastro-Balaguer. Le prisme de chevauchement est forme habituellement aux retrecissements de sel sans changement de niveau structural, meme si pour certains emplacements les prismes de chevauchement se sont developpes au-dessus de la geometrie de rampe de chevauchement. Les contraintes de temps et de l'evolution anticlinale de la zone de plissement et de chevauchement de l'avant-pays indiquent la presence de prismes de chevauchement au nord et anterieurs situes aux anticlinaux Oliana et Puig-reig et a l'anticlinal Sanaiija qui ont ete abandonnes a mesure que la deformation se depla<;a vers le sud. Les prismes de chevauchement vers le front ont ete integres a la zone triangulaire qui s'est elargie it mesure que les nouveaux prismes de chevauchement se sont developpes vers l'avant, it la limite sud de la marge de niveaux d"'evaporites" plus eleves. L'exemple expose est bien connu it cause des affleurements continus, des relations sedimentaires syntectoniques et des nouveaux profils sismiques de bonnes qualites ainsi que le contr61e de subsurface des puits d'exploration de petrole et de potasse.
Identifiersissn: 0007-4802
Appears in Collections:(Geo3Bcn) Artículos

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