Rift zone reorganization through flank instability in ocean island volcanoes: an example from Tenerife, Canary Islands
Abstract
The relationship between rift zones and flank instability in ocean island volcanoes is often inferred but rarely documented. Our field data, aerial image analysis, and 40Ar/39Ar chronology from Anaga basaltic shield volcano on Tenerife, Canary Islands, support a rift zone—flank instability relationship. A single rift zone dominated the early stage of the Anaga edifice (~6–4.5 Ma). Destabilization of the northern sector led to partial seaward collapse at about ~4.5 Ma, resulting in a giant landslide. The remnant highly fractured northern flank is part of the destabilized sector. A curved rift zone developed within and around this unstable sector between 4.5 and 3.5 Ma. Induced by the dilatation of the curved rift, a further rift-arm developed to the south, generating a three-armed rift system. This evolutionary sequence is supported by elastic dislocation models that illustrate how a curved rift zone accelerates flank instability on one side of a rift, and facilitates dike intrusions on the opposite side. Our study demonstrates a feedback relationship between flank instability and intrusive development, a scenario probably common in ocean island volcanoes. We therefore propose that ocean island rift zones represent geologically unsteady structures that migrate and reorganize in response to volcano flank instability.
Keywords
Tenerife Rift zone Dike intrusion Volcano flank instability Constructive-destructive feedback mechanism Canary IslandsNotes
Acknowledgements
S. Krein and S. Münn are thanked for help with the aerial photograph digitalization and laboratory work. The paper benefited from reviews, discussions and comments by B. van Wyk de Vries, T. Druitt and T.H. Hansteen. Financial support was provided by the Deutsche Forschungsgemeinschaft (DFG grant WA 1642 to TRW, and DFG grants Schm 250/72 and Schm 250/77 to HUS), by Trinity College Dublin to VRT, by CSTARS at the University of Miami to BC and FA, and by the Alexander v. Humboldt foundation to AB.
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