Gravimetric study of the shallow basaltic plumbing system of Tenerife, Canary Islands

Sainz-Maza, Sergio; Martı́, Joan; Montesinos, Fuensanta G.; Gomez, A.; Pablo, Jorge Pereda de; García-Maroto, M. Calvo

doi:10.1016/j.pepi.2019.106319

Cited by 8 publications

(13 citation statements)

References 36 publications

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“…There are many gravimetric studies in volcanic areas (e.g., Fedi et al., 2018; Montesinos et al., 2006, 2011; Sainz‐Maza Aparicio et al., 2019), which support the benefits of using gravity inversion methods to model crustal structures. The different density contrasts in regions where volcanic processes have occurred provide optimal conditions to apply these gravity methods.…”

Section: Introductionmentioning

confidence: 90%

Imaging the Volcanic Structures Beneath Gran Canaria Island Using New Gravity Data

et al. 2022

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From a new gravity data set that covers homogeneously the whole surface of Gran Canaria (Canary Islands, Spain) and marine gravity data in the nearest offshore, we have obtained a Bouguer anomaly gravity map of the island which improves the previous ones. Using these gravity anomalies, we have applied a gravity inversion approach to investigate the structures beneath the surface of Gran Canaria Island and derive a 3D gravity sources model. The geometry of structures with anomalous density values is constrained up to a depth of approximately 20,000 m below the sea level. The interpretation of the density model identified structures related to the different volcanic stages of Gran Canaria. Several deep‐rooted high‐density structures represent the intrusive bodies emplaced in the early formation of Gran Canaria and the magma plumbing system of the Miocene volcanic edifices. A low‐density body in the center of the island may be associated with the syenitic core of the felsic central volcanic edifice (Tejeda Caldera). Shallow low‐density structures identified fractures which acted as feeder dikes of monogenetic volcanoes during the rejuvenated stage. Finally, the NW‐SE rift, which is the most important volcano‐tectonic structure of Gran Canaria, has a characteristic gravimetric signature and represents a long‐lived extensional fracture zone that has controlled the volcanic activity at least since the Miocene.

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Section: Introductionmentioning

confidence: 90%

Imaging the Volcanic Structures Beneath Gran Canaria Island Using New Gravity Data

et al. 2022

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“…A similar gravimetric study based on genetic algorithm inversion and focusing on the NW, central and S sectors of the island was conducted by Sainz-Maza Aparicio et al (2019). They suggest the shallow character of the rift system and lateral migration pathways for magma along the rift, with ascending paths from a deeper zone located towards the east of this NW rift zone.…”

Section: Geological Structure Of Tenerifementioning

confidence: 85%

“…Below we review the knowledge of the island's geological structure as inferred from geological and geophysical data. A comprehensive summary is given in (e.g., Sainz-Maza Aparicio et al 2019).…”

Section: Geological Structure Of Tenerifementioning

confidence: 99%

Benefits and Limitations of the Growth Inversion Approach in Volcano Gravimetry Demonstrated on the Revisited 2004–2005 Tenerife Unrest

2022

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We review the current geoscientific knowledge of the volcanic unrest of 2004–2005 on Tenerife (Canary Islands) and revisit its gravimetric imprint. We revise the interpretation of the observed spatiotemporal (time-lapse) gravity changes accompanying the unrest by applying the Growth inversion approach based on model exploration and free geometry growing source bodies. We interpret the Growth solution, our new gravimetric model of the unrest, in the context of structural controls and the existing volcanological and geological knowledge of the central volcanic complex (CVC) of the island. Structural controls are inferred from the updated structural subsurface CVC density model obtained by our new Growth inversion of the available complete Bouguer anomalies (CBA data). Our gravimetric picture sees the unrest as a failed eruption, due to a stalled magma intrusion in the central position below the Teide–Pico Viejo stratocones, followed by upward and lateral migration of volcanic fluids reaching the aquifer and the SW end of the caldera wall. We thus classify the volcanic unrest of 2004–2005 as hybrid, in agreement with previous studies. The Growth inversion indicates that magma propagated along the boundary between the basaltic core of the island, the Boca Tauce volcanic body and the more permeable (less compacted) volcanic rocks with lower density. This gravimetric picture of the unrest provides new insights into the potential future reactivation of the volcanic system. Article Highlights Current geoscientific knowledge of the Tenerife volcanic unrest of 2004–2005 is reviewed New insights into the unrest are yielded by Growth inversion of observed time-lapse gravity changes Role of the freely adjustable inversion parameters in the Growth methodology is demonstrated Pros and cons of the Growth inversion approach in volcano gravimetric applications are illustrated

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“…1) have hosted all the Tenerife historical eruptions. The interior of these rift systems has recently been imaged using gravimetric inverse modelling, which has shown that they correspond to shallow structures that facilitate the lateral migration of deep basaltic magmas that rise close to the surface (Sainz-Maza et al 2019).…”

Section: Geological Settingmentioning

confidence: 99%

The Volcanic Geoheritage of El Teide National Park (Tenerife, Canary Islands, Spain)

Martí-Molist¹,

Dorado²,

López-Saavedra³

2022

Geoheritage

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El Teide National Park on the island of Tenerife (Canary Islands) is home to one of the most spectacular volcanic landscapes in the world. Although the conservation of its geodiversity is not a major problem given that it is governed by strict Spanish laws on geoconservation and is, in addition, a UNESCO World Heritage site, the diffusion of its geological values among the general public is more of a challenge due to the lack of any specific program for scientific knowledge transfer to visitors. The volcanological history of this national park needs to be transmitted in a clear and comprehensible fashion. However, the lack of adequate outreach material and of any coherent and consistent narrative regarding the significance of the island’s geological heritage makes it difficult to incorporate its geological history into the minds of visitors. This engenders a perception of its geoheritage that underestimates its importance. To remedy this misconception, the following tasks need to be carried out: (1) a compilation of all current scientific knowledge of the geology and volcanology of the area; (2) the identification of key geosites that offer the best means of understanding the history and evolution of this volcanic area; (3) the production of outreach and diffusion programs specifically designed to transmit this scientific knowledge to the general public; and (4) the establishment of permanent training programs for park and tourist guides that will guarantee the efficacy of this knowledge transmission. This contribution summarizes the main aspects of the geological history of El Teide National Park, identifies the elements that best exhibit its geological heritage, discusses the main problems observed in transmitting these geological values to visitors, and provides some clues as to how to face up to these challenges.

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Gravimetric study of the shallow basaltic plumbing system of Tenerife, Canary Islands

Cited by 8 publications

References 36 publications

Imaging the Volcanic Structures Beneath Gran Canaria Island Using New Gravity Data

Imaging the Volcanic Structures Beneath Gran Canaria Island Using New Gravity Data

Benefits and Limitations of the Growth Inversion Approach in Volcano Gravimetry Demonstrated on the Revisited 2004–2005 Tenerife Unrest

The Volcanic Geoheritage of El Teide National Park (Tenerife, Canary Islands, Spain)

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