RT info:eu-repo/semantics/article
T1 Reconstructing Late Pleistocene to Prehistorical Holocene Geomagnetic Field Variations From La Palma Lava Flows (Canary Islands, Spain): Unraveling Viscous Components
A1 Vernet Tarrago, Eva
A1 Calvo Rathert, Manuel
A1 Carrancho Alonso, Ángel
A1 Yamamoto, Yuhji
A1 Rodríguez Méndez, Lidia
A1 Parés Casanova, Josep M.
A1 Soler, Vicente
A1 Vernet, Eva
A1 Calvo‐Rathert, Manuel
A1 Carrancho, Ángel
A1 Rodríguez‐Méndez, Lidia
A1 Parés, Josep M.
K1 Paleomagnetic data
K1 Geomagnetic field
K1 Lava flows
K1 Geocronología
K1 Geological time
K1 Campos magnéticos
K1 Magnetic fields
AB We present new vector paleomagnetic data from 13 radiometrically dated lava-flows in southern La Palma (Canary Islands) spanning from 1 to 56 ka, which covers most of the Late Pleistocene to prehistoric Holocene volcanic record in the island. Using a paleointensity multimethod approach including Thellier-type and Shaw-type techniques, and combining detailed rock magnetic and mineralogical analyses, we assess the reliability and possible biases in paleointensity estimations in volcanic rocks affected by low-temperature oxidation and coarse ferromagnetic grains. Results indicate a strong viscous component linked to maghemitization, which compromises paleointensity reliability and accuracy. Low temperature demagnetization pretreatments significantly mitigated the viscosity contribution, improving success rates by highlighting the original thermoremanent magnetization (TRM) and revealing possible overestimations in standard Thellier-type treated samples affected by maghemitization. The full vector results, compared with several paleosecular variation curves, exhibited both low and high field intensity periods, including a relative paleointensity minimum at ∼27 ka (VADM ∼26 ZAm2) and the record of the Levant intensity high (VADM ∼108 ZAm2). This study contributes with valuable constraints for improving geomagnetic models, especially for low-latitude regions, and underscores the importance of integrating magnetic mineralogy with paleointensity protocols to mitigate bias in geomagnetic reconstructions.
PB American Geophysical Union
SN 2169-9313
YR 2026
FD 2026-02
LK https://hdl.handle.net/10259/11557
UL https://hdl.handle.net/10259/11557
LA eng
NO This research has been supported by projects PID2019105796GB-I00, PID2024-159094NB482-I00 of the Agencia Estatal de Investigación and BU037P23 of Junta de Castilla y León and the European Regional Development Fund. Eva Vernet Tarragó acknowledges funding from PRE2020-094803 (Agencia Estatal de Investigación) contract. This work was also supported by the project PID2022-136948NB-100/AEI/https://doi.org/10.13039/50110 00110 33/FEDER, UE (Spanish Ministry of Science and Innovation), and JSPS KAKENHI Grants JP21H01171 and JP24K00720.
DS Repositorio Institucional de la Universidad de Burgos
RD 08-may-2026