Influence of décollement-cover thickness variations in fold-and-thrust belts: Insights from centrifuge analog modeling

Santolaria, Pablo ; Harris, Lyal B. ; Casas, Antonio M. (Universidad de Zaragoza) ; Soto, Ruth

Resumen: Centrifuge analog modeling incorporating thickness variations of décollement and overlying sedimentary cover is used to study thrust-wedge evolution on salt-detached contractional systems involving tapered sedimentary cover. From simpler, layer-cake to 3D tapered décollement-cover sequences, our models constrain wedge evolution: a more advanced front, where the cover is thicker, promotes differential frontal translation and triggers vertical axis rotation of several hinterland anticlines which appear towards the thinner cover area. In all cases, the décollement level is strongly sheared and tends to migrate laterally toward the thinner cover areas. Models are compared with previous analog models under normal gravity and the natural example of the South Pyrenean Central salient. All in all, we conclude that a 3D tapered décollement-cover basin architecture, as a sole factor, can determine the formation of a thrust salient formed by increasing structural curvature (progressive arc).

Idioma: Inglés

DOI: 10.1016/j.jsg.2022.104704

Año: 2022

Publicado en: Journal of Structural Geology 163 (2022), 104704 [16 pp.]
ISSN: 0191-8141

Factor impacto JCR: 3.1 (2022)

Categ. JCR: GEOSCIENCES, MULTIDISCIPLINARY rank: 80 / 202 = 0.396 (2022) - Q2 - T2

Factor impacto CITESCORE: 6.2 - Earth and Planetary Sciences (Q1)

Factor impacto SCIMAGO: 1.225 - Geology (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2010-21968-C02-02

Tipo y forma: Article (Published version)

Área (Departamento): Área Geodinámica Interna (Dpto. Ciencias de la Tierra)