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Floating stones off El Hierro, Canary Islands [Elektronski vir] : xenoliths of pre-island sedimentary origin in the early products of the October 2011 eruptionTroll, Valentin R. ...A submarine eruption started off the south coast of El Hierro, Canary Islands, on 10 October 2011 and con- tinues at the time of this writing (February 2012). In the first days of the event, peculiar ... eruption products were found floating on the sea surface, drifting for long distances from the eruption site. These specimens, which have in the mean- time been termed “restingolites” (after the close-by village of La Restinga), appeared as black volcanic “bombs” that ex- hibit cores of white and porous pumice-like material. Since their brief appearance, the nature and origin of these “floating stones” has been vigorously debated among researchers, with important implications for the interpretation of the hazard potential of the ongoing eruption. The “restingolites” have been proposed to be either (i) juvenile high-silica magma (e.g. rhyolite), (ii) remelted magmatic material (trachyte), (iii) altered volcanic rock, or (iv) reheated hyaloclastites or zeolite from the submarine slopes of El Hierro. Here, we provide evidence that supports yet a different conclusion. We have analysed the textures and compositions of repre- sentative “restingolites” and compared the results to previous work on similar rocks found in the Canary Islands. Based on their high-silica content, the lack of igneous trace element signatures, the presence of remnant quartz crystals, jasper fragments and carbonate as well as wollastonite (derived from thermal overprint of carbonate) and their relatively high oxygen isotope values, we conclude that “restingolites” are in fact xenoliths from pre-island sedimentary layers that were picked up and heated by the ascending magma, causing them to partially melt and vesiculate. As they are closely resem- bling pumice in appearance, but are xenolithic in origin, we refer to these rocks as “xeno-pumice”. The El Hierro xeno- pumices hence represent messengers from depth that help us to understand the interaction between ascending magma and crustal lithologies beneath the Canary Islands as well as in similar Atlantic islands that rest on sediment-covered ocean crust (e.g. Cape Verdes, Azores). The occurrence of “restin- golites” indicates that crustal recycling is a relevant process in ocean islands, too, but does not herald the arrival of po- tentially explosive high-silica magma in the active plumbing system beneath El Hierro.Source: Solid earth. - ISSN 1869-9529 (Vol. 3, no. 1, 2012, str. 97–110)Type of material - e-article ; adult, seriousPublish date - 2012Language - englishCOBISS.SI-ID - 136658435
Author
Troll, Valentin R. |
Klügel, A. |
Longpré, M.-A. |
Burchardt, S. |
Deegan, F. M. |
Carracedo, Juan Carlos |
Wiesmaier, S. |
Kueppers, U. |
Dahren, B. |
Blythe, L. S. |
Hansteen, T. H. |
Freda, C. |
Budd, D. A. |
Jolis, E. M. |
Jonsson, R. E. |
Meade, F. C. |
Harris, C. |
Berg, S. E. |
Mancini, Lucia |
Polacci, Margherita |
Pedroza, K.
Topics
ksenoliti |
sinhrotronska rentgenska mikrotomografija |
vulkan El Hierro |
vulkanski izbruh |
rentgenska difrakcija |
analiza izotopov |
odprti dostop |
xenoliths |
synchrotron X-ray microtomography |
El Hierro volcano |
volcanic eruption |
X-ray diffraction |
isotope analysis |
open access
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Troll, Valentin R. | ![]() |
Klügel, A. | ![]() |
Longpré, M.-A. | ![]() |
Burchardt, S. | ![]() |
Deegan, F. M. | ![]() |
Carracedo, Juan Carlos | ![]() |
Wiesmaier, S. | ![]() |
Kueppers, U. | ![]() |
Dahren, B. | ![]() |
Blythe, L. S. | ![]() |
Hansteen, T. H. | ![]() |
Freda, C. | ![]() |
Budd, D. A. | ![]() |
Jolis, E. M. | ![]() |
Jonsson, R. E. | ![]() |
Meade, F. C. | ![]() |
Harris, C. | ![]() |
Berg, S. E. | ![]() |
Mancini, Lucia | 56577 |
Polacci, Margherita | ![]() |
Pedroza, K. | ![]() |
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