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

Autor: F. G. Montesinos, J. Arnoso, D. Gómez‐Ortiz, M. Benavent, I. Blanco‐Montenegro, E. Vélez, T. Martín‐Crespo, A. V. Gorbatikov, M. Y. Stepanova
Rok vydání: 2022
Předmět:
Zdroj: E-Prints Complutense. Archivo Institucional de la UCM
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ISSN: 2169-9356
2169-9313
DOI: 10.1029/2022jb024863
Popis: 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.
Databáze: OpenAIRE
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