168436 20260205155159.0 doi 10.1017/S0016756825100514 sideral 147907 ART-2026-147907 eng Simón-Muzás, Ana Interplay of caldera and tectonic subsidence in an inverted Late Carboniferous–Permian basin (Central Pyrenees) 2026 Deposits of thick volcanic and volcaniclastic series can be interpreted as either related to regional tectonics (commonly extensional or transtensional tectonics) or local volcanic mechanisms (caldera collapse). In order to distinguish between these two end-member mechanisms, we propose the use of magnetic techniques, namely analysis of Anisotropy of Magnetic Susceptibility (AMS) and paleomagnetism, and analysis of geological structures. These techniques have been applied to the Estac Basin (Central Pyrenees), an inverted Late Carboniferous–Permian basin now involved in the antiformal stack of the Pyrenean belt. AMS data provide directions of flow of volcanic rocks that can be interpreted in terms of palaeo-slopes and therefore can be related to structures contemporary with deposition and Late Carboniferous–Permian volcanic activity. The maximum of the magnetic lineation (i.e. volcanic paleoflow) direction is bimodal, with (i) an absolute maximum (as occurring in most South-Pyrenean Late Carboniferous–Permian basins) along a WNW–ESE direction and (ii) a secondary magnetic lineation along an N–S direction. Paleomagnetic data obtained from the volcanic products show a primary magnetization or early remagnetization compatible with the Late Carboniferous–Permian paleomagnetic reference direction and allow us to reconstruct an early folding probably related to the warping of the basin. The magnetic and structural data can be interpreted according to a volcano-tectonic subsidence model in which E–W faults played a major role and caldera collapse contributed to the important thickness of the volcaniclastic deposits. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/MICINN/FPU19-02353 info:eu-repo/grantAgreement/ES/MICINN/PID2019-108753GB-C22 info:eu-repo/grantAgreement/ES/MICINN/PID2020-114273GB-C22 info:eu-repo/semantics/openAccess by-sa https://creativecommons.org/licenses/by-sa/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Soto, Ruth García-Lasanta, Cristina Housen, Bernard Gisbert, Josep Universidad de Zaragoza (orcid)0000-0002-3276-5871 Casas-Sainz, Antonio Universidad de Zaragoza (orcid)0000-0003-3652-3527 2000 685 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Petrología y Geoquímica 2000 428 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Geodinámica Interna 163 (2026), [24 pp.] Geol. mag. GEOLOGICAL MAGAZINE 0016-7568 10898953 http://zaguan.unizar.es/record/168436/files/texto_completo.pdf Versión publicada 3363872 http://zaguan.unizar.es/record/168436/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:168436 articulos driver 2026-02-05-14:36:33 ARTICLE