Buttressing and fractional spreading of Tenerife, an experimental approach on the formation of rift zones

Details Buttressing and fractional spreading of Tenerife, an experimental approach on the formation of rift zones Buttressing and fractional spreading of Tenerife, an experimental approach on the formation of rift zones

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30f..29w&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 6, pp. 29-1, CiteID 1296, DOI 10.1029/2002GL016610

Physics

10

Tectonophysics: Dynamics, Gravity And Tectonics, Tectonophysics: Stresses-General, Volcanology: Magma Migration, Volcanology: General Or Miscellaneous

Scientific paper

The island of Tenerife is composed of three Miocene shields, which are centered by the Cañadas volcano since the Pliocene. Tenerife sits on more than 2 km thick oceanic sediments. Quaternary volcanism of the Cañadas series and giant landslides were principally confined to triaxial rift zones. The mechanism of triaxial rifting, however, has remained unclear. Physical analog models show that these rift zones may have formed by gravity-driven lateral escape of island segments, induced by loading of the deformable substratum. For experiments scaled to Tenerife, three adjacent sand cones were mounted onto viscous PDMS substratum. Gravitational spreading caused circumferential expansion of each cone, until a large edifice (Cañadas) was constructed in their center. The older cones now acted each as a buttress; radial fractures were overprinted by fractional spreading of the Cañadas edifice. This resulted in formation of three main extensional zones, resembling the triaxial rifting configuration of Tenerife.

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