000163129 001__ 163129
000163129 005__ 20251009145936.0
000163129 0247_ $$2doi$$a10.1007/s00531-025-02530-1
000163129 0248_ $$2sideral$$a145616
000163129 037__ $$aART-2025-145616
000163129 041__ $$aeng
000163129 100__ $$0(orcid)0000-0001-5824-5367$$aSimón-Muzás, Ana
000163129 245__ $$aSecondary precipitation of Fe–Ti oxides as a source for strongly changing magnetic properties in ancient volcanic rocks (Cadí Basin, Pyrenees)
000163129 260__ $$c2025
000163129 5060_ $$aAccess copy available to the general public$$fUnrestricted
000163129 5203_ $$aAbstract
Strong changes of magnetic properties (magnetic susceptibility and natural magnetic remanence) affecting large volumes of rocks can be conditioned by a series of factors, including circulation of hydrothermal fluids or meteoric waters, often favored by the primary porosity of the rock or pervasive fracturing. In the Late Carboniferous-Permian Cadí Basin, in the Eastern Pyrenees, there are volcanic rocks that show a unique pattern of magnetic anomalies up to 200 nT in amplitude revealing a heterogeneous distribution of their magnetic properties. To unravel the origin of these anomalies, we performed a detailed study of the magnetic properties of the volcanic and volcaniclastic rocks, combined with magnetic surveying and analysis of brittle structures. The results indicate that the origin of the strong variations in the magnetic properties is linked to: (i) lithological changes within the volcanic series, and (ii) the inhomogeneous secondary precipitation of ferromagnetic minerals. As a result of these secondary processes, magnetic fabrics do not reliably record either the volcanic paleoflow or the deformation imprint. The mineralogical composition can be interpreted as the result of a strong hydrothermal alteration that took place during early diagenetic stages, which was also responsible for the neoformation of magnetite crystals with variable titanium content. Random fluid circulation during the Late-Variscan stage could be the origin of these strong variations in magnetic properties.
Graphical Abstract
000163129 536__ $$9info:eu-repo/grantAgreement/ES/AEI/PID2019-108753GB-C22$$9info:eu-repo/grantAgreement/ES/MICINN/FPU19-02353$$9info:eu-repo/grantAgreement/ES/MICINN/PID2020-114273GB-C22$$9info:eu-repo/grantAgreement/ES/MICIU /PID2023-148256NB-I00
000163129 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es
000163129 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000163129 700__ $$0(orcid)0000-0003-3652-3527$$aCasas-Sainz, Antonio M.$$uUniversidad de Zaragoza
000163129 700__ $$aSoto, Ruth
000163129 700__ $$0(orcid)0000-0003-1563-6434$$aOliva-Urcia, Belén$$uUniversidad de Zaragoza
000163129 7102_ $$12000$$2428$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Geodinámica Interna
000163129 773__ $$g114, 5 (2025), 959-978$$pInt. j. earth sci.$$tInternational Journal of Earth Sciences$$x1437-3254
000163129 8564_ $$s5640980$$uhttps://zaguan.unizar.es/record/163129/files/texto_completo.pdf$$yVersión publicada
000163129 8564_ $$s2498626$$uhttps://zaguan.unizar.es/record/163129/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000163129 909CO $$ooai:zaguan.unizar.es:163129$$particulos$$pdriver
000163129 951__ $$a2025-10-08-12:59:46
000163129 980__ $$aARTICLE