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Bulletin of Volcanology

, 76:788 | Cite as

Structural control of monogenetic volcanism in the Garrotxa volcanic field (Northeastern Spain) from gravity and self-potential measurements

  • S. Barde-CabussonEmail author
  • J. Gottsmann
  • J. Martí
  • X. Bolós
  • A. G. Camacho
  • A. Geyer
  • Ll. Planagumà
  • E. Ronchin
  • A. Sánchez
Research Article

Abstract

We report new geophysical observations on the distribution of subsurface structures associated with monogenetic volcanism in the Garrotxa volcanic field (Northern Spain). As part of the Catalan Volcanic Zone, this Quaternary volcanic field is associated with the European rifts system. It contains the most recent and best preserved volcanic edifices of the Catalan Volcanic Zone with 38 monogenetic volcanoes identified in the Garrotxa Natural Park. We conducted new gravimetric and self-potential surveys to enhance our understanding of the relationship between the local geology and the spatial distribution of the monogenetic volcanoes. The main finding of this study is that the central part of the volcanic field is dominated by a broad negative Bouguer anomaly of around −0.5 mGal, within which a series of gravity minima are found with amplitudes of up to −2.3 mGal. Inverse modelling of the Bouguer data suggests that surficial low-density material dominates the volcanic field, most likely associated with effusive and explosive surface deposits. In contrast, an arcuate cluster of gravity minima to the NW of the Croscat volcano, the youngest volcano of this zone, is modelled by vertically extended low-density bodies, which we interpret as a complex ensemble of fault damage zones and the roots of young scoria cones. A ground-water infiltration zone identified by a self-potential anomaly is associated with a steep horizontal Bouguer gravity gradient and interpreted as a fault zone and/or magmatic fissure, which fed the most recent volcanic activity in the Garrotxa. Gravimetric and self-potential data are well correlated and indicate a control on the locations of scoria cones by NNE–SSW and NNW–SSE striking tectonic features, which intersect the main structural boundaries of the study area to the north and south. Our interpretation of the data is that faults facilitated magma ascent to the surface. Our findings have major implications for understanding the relationship between subsurface structures and potential future volcanic activity in the Garrotxa volcanic field.

Keywords

Self-potential Gravimetry Garrotxa Structural control Monogenetic volcanism 

Notes

Acknowledgments

We thank the Natural Park of the La Garrotxa Volcanic Zone and its staff for their support throughout this study. SBC acknowledges the JAE-Doc postdoctoral personal grant program of Consejo Superior de Investigaciones Científicas (JAEDoc_09_01319), JG acknowledges funding from a Royal Society University Research Fellowship and an International Joint Project grant with JM and AG acknowledges her post-doctoral Juan de la Cierva Grant (JCI-2010-06092). X. Bolós has been funded by grant Beca d’investigació “Oriol de Bolós” en Ciències Naturals (Olot, Spain). AGC has been supported by the MICINN research project AYA2010-17448. The work was also partially supported by the European Commission (FP7 Theme: ENV.2011.1.3.3-1; grant 282759: “VUELCO”). We sincerely thank the Executive Editor James D. L. White, Editor Takeshi Nishimura, and reviewers Charles Connor and Koki Aizawa for their constructive and helpful comments on our manuscript.

Supplementary material

445_2013_788_MOESM1_ESM.doc (838 kb)
Table 1 Detailed listing of gravity benchmarks and resultant gravity data (DOC 838 kb)

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Copyright information

© European Union 2013

Authors and Affiliations

  • S. Barde-Cabusson
    • 1
    Email author
  • J. Gottsmann
    • 2
  • J. Martí
    • 1
  • X. Bolós
    • 1
  • A. G. Camacho
    • 3
  • A. Geyer
    • 1
  • Ll. Planagumà
    • 4
  • E. Ronchin
    • 1
  • A. Sánchez
    • 1
  1. 1.Institute of Earth Sciences Jaume Almera, ICTJA-CSICBarcelonaSpain
  2. 2.Department of Earth SciencesUniversity of BristolBristolUK
  3. 3.Instituto de Geociencias (CSIC, UCM)MadridSpain
  4. 4.Tosca, Environment Services of EducationOlotSpain

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