2024-03-29T14:30:51Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1840162019-06-27T09:06:36Zcom_10261_48com_10261_5col_10261_301
DIGITAL.CSIC
author
Berg, S. E.
author
Troll, Valentín R.
author
Deegan, Frances M.
author
Burchardt, Steffi
author
Krumbholz, M.
author
Mancini, L.
author
Polacci, M.
author
Carracedo, Juan Carlos
author
Soler, Vicente
author
Arzilli, F.
author
Brun, F
funder
European Science Foundation
funder
Ministerio de Educación y Ciencia (España)
funder
Royal Swedish Academy of Sciences
funder
Swedish Research Council
funder
Uppsala University
2019-06-13T13:02:17Z
2019-06-13T13:02:17Z
2016-12
Bulletin of Volcanology 78: 85 (2016)
0258-8900
http://hdl.handle.net/10261/184016
10.1007/s00445-016-1080-x
1432-0819
http://dx.doi.org/10.13039/501100007051http://dx.doi.org/10.13039/501100000782http://dx.doi.org/10.13039/501100001725
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 formation, most likely by successive release of pore water and mineral water during incremental heating and decompression of the sedimentary protoliths.
eng
closedAccess
Sedimentary ocean crust
Xeno-pumice
El Hierro
Heterogeneous vesiculation
Vesicle size distribution
Vesicle morphologies
X-CT imaging
Heterogeneous vesiculation of 2011 El Hierro xeno-pumice revealed by X-ray computed microtomography
artículo
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URL
https://digital.csic.es/bitstream/10261/184016/1/accesoRestringido.pdf
File
MD5
42637ae8545636bc41605c1740a9a84e
15753
application/pdf
accesoRestringido.pdf