000151266 001__ 151266
000151266 005__ 20251017144547.0
000151266 0247_ $$2doi$$a10.1007/s41513-025-00288-8
000151266 0248_ $$2sideral$$a143105
000151266 037__ $$aART-2025-143105
000151266 041__ $$aeng
000151266 100__ $$aSierra-Campos, P.
000151266 245__ $$aMagnetic fabrics of weakly-deformed mudrocks from the Jaca-Pamplona basin (Pyrenees); new constrains on the sensitivity of magnetic fabrics and the tectonic evolution of the Southern Pyrenees
000151266 260__ $$c2025
000151266 5060_ $$aAccess copy available to the general public$$fUnrestricted
000151266 5203_ $$aAbstract
The anisotropy of magnetic susceptibility (AMS) is a sensitive marker for studying the spatial and temporal evolution of orogens. In weakly deformed rocks deposited in compressive contexts the AMS signal mostly reflects the preferential alignment and deformation of paramagnetic phyllosilicates during early layer parallel shortening (LPS) related to both near and/or far-field structures. Moreover, localized deformation and post-depositional shearing in the vicinity of thrusts can alter early LPS fabrics. An AMS analysis of 651 samples was conducted along two stratigraphic sections, Izaga and Berdún (2800 m-thick), in the Jaca-Pamplona basin (Southern Pyrenees). The sampled sections record the tectonosedimentary evolution of the basin from the Late Lutetian to the Middle Priabonian. In both sections, the magnetic fabric is controlled by LPS. The lower and upper part of the Izaga section shows triaxial to oblate and oblate ellipsoids, respectively, which are interpreted to indicate a decrease of tectonic activity associated to the Larra thrust system. The Berdún section begins with oblate ellipsoids, which subsequently become triaxial and prolate before returning oblate towards the top of the succession. Ellipsoids in the lower part of the section exhibit an incipient girdle between the minimum and intermediate axes, which signal an undetected thrust, further corroborated, by structural analysis. The remainder of the Berdún section shows a magnetic fabric derived from LPS but it is not possible to associate it to any structure. The uppermost part of the section displays prolate ellipsoids, which we link to enhanced tectonic activity leading to continentalization of the basin.
000151266 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es
000151266 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000151266 700__ $$aCalvín, P.
000151266 700__ $$0(orcid)0000-0002-5159-8140$$aIzquierdo-Llavall, E.
000151266 700__ $$aPérez-Landazabal, J.I.
000151266 700__ $$aMontes, M.
000151266 700__ $$0(orcid)0000-0002-8929-9429$$aLuzón, A.$$uUniversidad de Zaragoza
000151266 700__ $$aBellido, E.
000151266 700__ $$0(orcid)0000-0002-0504-2352$$aPueyo, E.L.
000151266 700__ $$0(orcid)0000-0001-6527-3972$$aLarrasoaña, J.C.
000151266 7102_ $$12000$$2280$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Estratigrafía
000151266 773__ $$g(2025), [19 pp.]$$pJ. iber. geol.$$tJOURNAL OF IBERIAN GEOLOGY$$x1698-6180
000151266 8564_ $$s8709820$$uhttps://zaguan.unizar.es/record/151266/files/texto_completo.pdf$$yVersión publicada
000151266 8564_ $$s1903653$$uhttps://zaguan.unizar.es/record/151266/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000151266 909CO $$ooai:zaguan.unizar.es:151266$$particulos$$pdriver
000151266 951__ $$a2025-10-17-14:10:20
000151266 980__ $$aARTICLE