Axial longitudinal flow in volcanic materials of the late carboniferous-permian Cadí basin (Southern Pyrenees) determined from anisotropy of magnetic susceptibility
Entity
UAM. Departamento de Geología y GeoquímicaPublisher
ElsevierDate
2021-12-02Citation
10.1016/j.jvolgeores.2021.107443
Journal of Volcanology and Geothermal Research 421 (2022): 107443
ISSN
0377-0273 (print); 1872-6097 (online)DOI
10.1016/j.jvolgeores.2021.107443Project
Gobierno de España. CGL2017-84901-C2-2-P; Gobierno de España. PID2020-114273GB-C22; Gobierno de España. PID2019-108753GB-C22Editor's Version
https://doi.org/10.1016/j.jvolgeores.2021.107443Subjects
Late Carboniferous-Permian; Magnetic fabrics; Pyrenees; Volcaniclastic; Volcanism; GeologíaRights
© 2021 The Author(s)
Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
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
Files in this item
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)
Related items
Showing items related by title, author, creator and subject.