Utiliza este identificador para citar o vincular este elemento: http://hdl.handle.net/10553/41325
Títulos: Heterogeneous vesiculation of 2011 El Hierro xeno-pumice revealed by X-ray computed microtomography
Autores/as: Berg, S. E.
Troll, V. R.
Deegan, F. M.
Burchardt, S.
Krumbholz, M.
Mancini, L.
Polacci, M.
Carracedo, J.C. 
Soler, V.
Arzilli, F.
Brun, F.
Clasificación UNESCO: 250621 Vulcanología
Palabras clave: El Hierro
Xeno-pumice
X-CT imaging
Vesicle morphologies
Vesicle size distribution
Heterogeneous vesiculation
Sedimentary ocean crust
Fecha de publicación: 2016
Revistas: Bulletin of Volcanology 
Resumen: During the first week of the 2011 El Hierro submarine eruption, abundant light-coloured pumiceous, high-silica volcanic bombs coated in dark basanite were found floating on the sea. The composition of the light-coloured frothy material ('xeno-pumice') is akin to that of sedimentary rocks from the region, but the textures resemble felsic magmatic pumice, leaving their exact mode of formation unclear. To help decipher their origin, we investigated representative El Hierro xeno-pumice samples using X-ray computed microtomography for their internal vesicle shapes, volumes, and bulk porosity, as well as for the spatial arrangement and size distributions of vesicles in three dimensions (3D). We find a wide range of vesicle morphologies, which are especially variable around small fragments of rock contained in the xeno-pumice samples. Notably, these rock fragments are almost exclusively of sedimentary origin, and we therefore interpret them as relicts an the original sedimentary ocean crust protolith(s). The irregular vesiculation textures observed probably resulted from pulsatory release of volatiles from multiple sources during xeno-pumice Brun, F. formation, most likely by successive release of pore water and mineral water during incremental heating and decompression of the sedimentary protoliths.
URI: http://hdl.handle.net/10553/41325
ISSN: 0258-8900
DOI: 10.1007/s00445-016-1080-x
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