Controls of magma chamber zonation on eruption dynamics and deposits stratigraphy: The case of El Palomar fallout succession (Tenerife, Canary Islands)

摘要: Abstract Anticipating volcanic eruptions at central volcanoes require knowing how magma chambers prepare for new eruptions. Pre-eruptive processes that occur in such are recorded the products of these eruptions, so their characterisation terms composition and physics offers clues to understand past predict future ones. Here, we study very well preserved pyroclastic succession El Palomar Member (712 ± 41 ka), Las Canadas caldera, Teide, Canary Islands. This deposit resulted from a single explosive eruption phonolitic started with sustained column (sub-plinian or plinian) formed massive, 40 m thick non-welded fallout deposit, progressively changing into lower intensity fire fountain deposited 25 m strongly welded pumices. Stratigraphic petrological data suggest this was related thermally-compositionally zoned relatively shallow chamber which arrival hotter more mafic rapidly triggered eruption. The studied shows structure maintained during whole process, allows one reconstruct what happened Comparison current situation Teide volcano alerts on potential rapid preparation case sufficient available plumbing system active if inputs deeper take place.