000132280 001__ 132280 000132280 005__ 20241125101154.0 000132280 0247_ $$2doi$$a10.1016/j.jsg.2023.105042 000132280 0248_ $$2sideral$$a137497 000132280 037__ $$aART-2023-137497 000132280 041__ $$aeng 000132280 100__ $$aSantolaria, Pablo 000132280 245__ $$aOrigin of oblique structures controlled by pre-tectonic thickness variations in frictional and salt-bearing fold-and-thrust belts: Insights from analogue modelling 000132280 260__ $$c2023 000132280 5060_ $$aAccess copy available to the general public$$fUnrestricted 000132280 5203_ $$aThis work includes, first, a synthesis of experimental analogue modelling programs assessing the influence of along-strike thickness variations in the development of oblique structures in fold-and-thrust belts. As a second part, we present a new experimental program testing, systematically, the influence of tapered décollement-cover thrust wedges. Previous experiments show that frictional, brittle models feature numerous, short-wavelength structures where the cover is thinner. Deformation fronts are totally or locally oblique to the backstop when the cover thinning is progressive or sharp, respectively. Low (<30°) or higher structural obliquities occur when thickness variations are progressive or sharp, respectively. The addition of a basal or intermediate décollement, commonly entails the transference of deformation towards its external pinch-out. Consequently salients occur and transfer zones and oblique structures form over décollement boundaries. Their location and orientation strongly depend on the pre-compressional shape of the décollements. Furthermore, as demonstrated by our modelling results, tapered brittle covers over viscous décollements result in asymmetric thrust wedges formed by structures that end or change their vergence laterally, resulting in obliquities generally <30°. Two natural case studies, showing strong (South Pyrenean Central Salient) or moderately oblique (Keping Shan fold-and-thrust belt) structures are revisited and compared to the described analogue models. 000132280 536__ $$9info:eu-repo/grantAgreement/ES/MICINN/CGL2016-77560-C2$$9info:eu-repo/grantAgreement/ES/MICINN/PID2019-108753GB-C22$$9info:eu-repo/grantAgreement/ES/MICINN/PID2020-114273GB-C22 000132280 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/ 000132280 590__ $$a2.6$$b2023 000132280 592__ $$a1.085$$b2023 000132280 591__ $$aGEOSCIENCES, MULTIDISCIPLINARY$$b97 / 254 = 0.382$$c2023$$dQ2$$eT2 000132280 593__ $$aGeology$$c2023$$dQ1 000132280 594__ $$a6.0$$b2023 000132280 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000132280 700__ $$0(orcid)0000-0002-5159-8140$$aIzquierdo-Llavall, Esther 000132280 700__ $$0(orcid)0000-0002-1929-8850$$aSoto, Ruth 000132280 700__ $$0(orcid)0000-0002-9743-8695$$aRomán-Berdiel, Teresa$$uUniversidad de Zaragoza 000132280 700__ $$0(orcid)0000-0003-3652-3527$$aCasas-Sainz, Antonio$$uUniversidad de Zaragoza 000132280 7102_ $$12000$$2428$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Geodinámica Interna 000132280 773__ $$g179 (2023), 105042 [23 pp.]$$pJ. struct. geol.$$tJournal of Structural Geology$$x0191-8141 000132280 8564_ $$s1234638$$uhttps://zaguan.unizar.es/record/132280/files/texto_completo.pdf$$yVersión publicada 000132280 8564_ $$s2464995$$uhttps://zaguan.unizar.es/record/132280/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000132280 909CO $$ooai:zaguan.unizar.es:132280$$particulos$$pdriver 000132280 951__ $$a2024-11-22-12:08:21 000132280 980__ $$aARTICLE