Axial longitudinal flow in volcanic materials of the late carboniferous-permian Cadí basin (Southern Pyrenees) determined from anisotropy of magnetic susceptibility
EntityUAM. Departamento de Geología y Geoquímica
10.1016/j.jvolgeores.2021.107443Journal of Volcanology and Geothermal Research 421 (2022): 107443
ISSN0377-0273 (print); 1872-6097 (online)
ProjectGobierno de España. CGL2017-84901-C2-2-P; Gobierno de España. PID2020-114273GB-C22; Gobierno de España. PID2019-108753GB-C22
SubjectsLate Carboniferous-Permian; Magnetic fabrics; Pyrenees; Volcaniclastic; Volcanism; Geología
Rights© 2021 The Author(s)
Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
The aim of this work is the application of the anisotropy of magnetic susceptibility (AMS) to the study of volcanic materials from the Late Carboniferous-Permian Cadí basin (southern Pyrenees) in order to (i) explore the limits of this technique in ancient volcanic materials that have undergone strong chemical alteration and a complex tectonic evolution and (ii) provide new insights on the deposition of volcanic materials in this tectonically controlled sedimentary basin. To establish a comparison with the petrofabric of rocks, AMS was complemented with observations and orientation analyses at the outcrop scale, in oriented polished blocks and in thin sections under the microscope. High resolution sampling (620 specimens from 56 sites located in five transects along a sequence 150 m thick) allowed to characterize the volcaniclastic and lava flow series. The AMS results show a fairly constant average magnetic lineation oriented WNW-ESE (in situ and tilt-corrected) and two secondary maxima (N-S to NE-SW in some areas). The magnetic mineralogy analyses indicate the contribution of paramagnetic and ferromagnetic (magnetite, Tc 580 °C) phases to susceptibility. The magnetic fabric has a close relationship with the spatial distribution and orientation of the mineral and grain components of the studied rocks, mainly controlled by depositional processes, with a negligible contribution of the tectonic imprint. Therefore, the magnetic lineation (i.e. K1 axes) can be reliably used as a paleoflow indicator. Nevertheless, it was not possible to establish a clear correspondence between lithological and magnetic fabric types. The results obtained indicate that the AMS approach represents a powerful tool to infer the paleoflow pattern in ancient volcanic and volcaniclastic rocks, even under a priori unfavourable conditions
Google Scholar:Simón-Muzás, Ana - Casas-Sainz, Antonio M. - Soto, Ruth - Gisbert, Josep - Román-Berdiel, Teresa - Oliva Urcia, Belén - Pueyo, Emilio L. - Beamud, Elisabet
This item appears in the following Collection(s)
Showing items related by title, author, creator and subject.
New insights into asymmetric folding by means of the anisotropy of magnetic susceptibility, Variscan and Pyrenean folds (SW Pyrenees)
Basement and cover architecture in the Central Pyrenees constrained by gravity data
10 Myr evolution of sedimentation rates in a deep marine to non-marine foreland basin system: Tectonic and sedimentary controls (Eocene, Tremp–Jaca Basin, Southern Pyrenees, NE Spain)