Deep volcanic morphology below Lanzarote, Canaries, from gravity inversion: New results for Timanfaya and implications

Camacho, Antonio G. and Prieto Morin, Juan Francisco and Ancochea, Eumenio and Fernández Torres, José (2018). Deep volcanic morphology below Lanzarote, Canaries, from gravity inversion: New results for Timanfaya and implications. "Journal of Volcanology And Geothermal Research", v. 369 ; pp. 64-79. ISSN 0377-0273. https://doi.org//10.1016/j.jvolgeores.2018.11.013.

Description

Title: Deep volcanic morphology below Lanzarote, Canaries, from gravity inversion: New results for Timanfaya and implications
Author/s:
  • Camacho, Antonio G.
  • Prieto Morin, Juan Francisco
  • Ancochea, Eumenio
  • Fernández Torres, José
Item Type: Article
Título de Revista/Publicación: Journal of Volcanology And Geothermal Research
Date: 22 November 2018
ISSN: 0377-0273
Volume: 369
Subjects:
Freetext Keywords: Lanzarote; Canary Islands; Gravity measurements; 3D density structure; Timanfaya; Plumbing system
Faculty: E.T.S.I. en Topografía, Geodesia y Cartografía (UPM)
Department: Ingeniería Cartográfica y Topografía
Creative Commons Licenses: Recognition - No derivative works - Non commercial

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (4MB) | Preview

Abstract

The deep roots of oceanic island volcanoes are poorly known and geophysical models can help to constrain pro-cesses such as magma storage and transport before and during eruptions. Lanzarote, Canary Islands, is a volcanicisland in post-erosional phase where, in the 18th century, one of the most important historical eruptions, consid-ering duration and volume, of the Canary Islands took place in the Timanfaya area. To improve the knowledge onthe structure of Lanzarote and in Timanfaya area, we carry out a gravity determination of the subsurface anom-alous 3D density structure, using an improved quasi-automatic inversion methodology. The obtained model pre-sents a 3D morphology of anomalous density bodies. We describe the improvements of the inversionmethodology, the adjusted model and interpretative conclusions corresponding to the structure and the long-term cumulative magmatic plumbing system of the island. Three high-density sources are described as resultingin the inference of three main volcanic complexes: a large central complex (San Bartolomé) and two smallercomplexes, one in the NE and a third smaller one located in the SW close to the Timanfaya area. The outcropsof Miocene lavaflows from the center of the Island can be attributed to the top of the central intrusive model.We infer the local plumbing system for Timanfaya volcano area by means of strongly tilted successive branchesof magma departing from the SWintrusive body. The structural results show no evidence of any magma chamberbelow Timanfaya as proposed by previous works. Wealso present a comparison of the gravity results and geolog-ical observations, showing different cases of correlation in the Island. They go from a good match between thegravity anomaly and the position of the central volcanic structure, to no anomaly associated to thefissural Qua-ternary volcanic activity.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainAYA2010-17448GEOSIRUnspecifiedNuevas metodologías para la integración e interpretación de datos de observación de la tierra desde el espacio: aplicaciones en ciencias de la tierra e ingeniería
Government of SpainESP2013-47780-C2-1-RUnspecifiedUnspecifiedEstudio de riesgos geológico-geotécnicos por explotación de acuíferos mediante técnicas espaciales y terrestres. Geodesia
Government of SpainCGL2017-86241-RUnspecifiedUnspecifiedLos megadeslizamientos de la dorsal NE de Tenerife: edad, geometría y actividad volcánica asociada
Government of SpainPR41/17-20952UnspecifiedUnspecifiedEl edificio volcánico central de Lanzarote y su papel en la formación de la isla
Government of Spain201530E019UnspecifiedJ. Fernández TorresObservación radar de satélite aplicada al estudio de deformaciones en las islas Canarias

More information

Item ID: 63774
DC Identifier: http://oa.upm.es/63774/
OAI Identifier: oai:oa.upm.es:63774
DOI: /10.1016/j.jvolgeores.2018.11.013
Official URL: https://www.sciencedirect.com/science/article/pii/S0377027318302373
Deposited by: Memoria Investigacion
Deposited on: 10 Feb 2021 16:07
Last Modified: 10 Feb 2021 16:07
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM