Pre-eruptive conditions at satellite vent eruptions at Teide-Pico Viejo complex (Tenerife, Canary Islands)

The Teide-Pico Viejo (T-PV) stratovolcanoes constitute one of the most potentially active volcanic complexes in Europe. T-PV was traditionally considered as a non-explosive system, but recent studies have pointed out explosive character their phonolitic magmas, including plinian and subplinian eruptions generation pyroclastic density currents, is evidenced volcanological record last 30 kyr. This activity mostly associated with satellite dome-like vents, which are characterised by presenting progressive transitions between effusive activity. In order to improve our understanding these types controlling mechanisms, we conducted petrological mineral characterisation products from different eruptive phases Pico Cabras dome. permitted us constrain pre-eruptive conditions magma infer potential factors that control changes dome-forming at and, particular, transition phases. Feldspar (anorthoclase sanidine), clinopyroxene (diopside augite), biotite, amphibole (kaersutite), magnetite, ilmenite, sodalite, glass samples were analysed using EPMA Micro-XRF. Our results suggest presence compositionally, thermally, volatile stratified chamber 100 ± 50 MPa prior eruption (between 9210 5911 years BP), change style activity, an efficiently fragmented dispersed sustained plume, poorly-fragmented, low-height, non-convective fountain (forming fountain-fed lava dome) glass-bearing flow controlled temperature amount volatiles dissolved melt (i.e., differences rheology). initial phase related emission highly evolved ponding 725–825 °C while containing 3.5–5 wt% H2O located upper part reservoir. fed formed main body reservoir stored below preceding 880 2.5–3 dissolved. zonation suggests triggered intrusion hotter mafic base chamber, induced overturn interior However, interaction internal magmas short enough prevent hybridization phenomena among them. compositions some feldspars equivalent those found El Abrigo eruption, caldera-forming episode (ca. 190 ka), demonstrating system can already produce factor should be future hazard assessment for Tenerife.