Preprints
https://doi.org/10.5194/egusphere-2024-1602
https://doi.org/10.5194/egusphere-2024-1602
06 Jun 2024
 | 06 Jun 2024
Status: this preprint is open for discussion.

The structural anatomy of the Pyrenees examined through EMAG2v2 magnetic data

África Gamisel-Muzás, Ruth Soto, Conxi Ayala, Tania Mochales, Félix Manuel Rubio, Pilar Clariana, Carmen Rey-Moral, and Juliana Martín-León

Abstract. The major goal of this work is to provide an insight into the structural anatomy of the Pyrenees based on the magnetic data from the Earth Magnetic Anomaly Grid 2-arc-minute resolution (EMAG2v2). We focused on providing qualitative and semi-quantitative evidence on the magnetic signature of the Pyrenees Mountain Range domains and structures. The integration of reduced to the pole and processed maps, as well as the Bouguer anomaly map with geological data, has proved to be significantly useful in order to shed light on the main anomaly sources. Considering their magnetic response and texture, several anomalies can be linked to buried geological bodies or changes in the magnetic character of the basement. We have estimated their source bodies depth through Euler and power spectrum calculations.

We have identified eight magnetic zones with different features and interpreted them in terms of the geological and structural setting of the area. The result is an overall interpretation of the Pyrenees main magnetic domains.

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África Gamisel-Muzás, Ruth Soto, Conxi Ayala, Tania Mochales, Félix Manuel Rubio, Pilar Clariana, Carmen Rey-Moral, and Juliana Martín-León

Status: open (until 18 Jul 2024)

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África Gamisel-Muzás, Ruth Soto, Conxi Ayala, Tania Mochales, Félix Manuel Rubio, Pilar Clariana, Carmen Rey-Moral, and Juliana Martín-León

Data sets

EMAG2: A 2–arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements. S. Maus et al. https://geomag.colorado.edu/emag2-earth-magnetic-anomaly-grid-2-arc-minute-resolution.html

Geological data of The Pyrenees (1:400.000) Geological Survey of Spain (IGME) and Bureau de Recherches Géologiques et Minières (BRGM) http://info.igme.es/cartografiadigital/geologica/mapa.aspx?parent=../tematica/tematicossingulares.aspx&Id=14&language=es

Gravimetry Data IGME- SIGEOF Geophysical Information System http://info.igme.es/SIGEOF/

África Gamisel-Muzás, Ruth Soto, Conxi Ayala, Tania Mochales, Félix Manuel Rubio, Pilar Clariana, Carmen Rey-Moral, and Juliana Martín-León

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Short summary
In this work we compare magnetic maps obtained from the EMAG2v2 (Earth Magnetic Anomaly Grid 2-arc-minute resolution) magnetic intensity data with the main geological structures and units of the Pyrenees and adjacent areas. The magnetic response arrangement for the different domains mimic the main structural lineaments and highlight the occurrence of major magnetic anomalies linked to specific geological bodies.