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Floating Sandstones Off El Hierro (Canary Islands, Spain): the Peculiar Case of the October 2011 Eruption : Volume 3, Issue 2 (01/12/2011)

By Troll, V. R.

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Book Id: WPLBN0004021820
Format Type: PDF Article :
File Size: Pages 25
Reproduction Date: 2015

Title: Floating Sandstones Off El Hierro (Canary Islands, Spain): the Peculiar Case of the October 2011 Eruption : Volume 3, Issue 2 (01/12/2011)  
Author: Troll, V. R.
Volume: Vol. 3, Issue 2
Language: English
Subject: Science, Solid, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Blythe, L. S., Berg, S., Dahren, B., Troll, V. R., Deegan, F. M., Wiesmaier, S.,...Freda, C. (2011). Floating Sandstones Off El Hierro (Canary Islands, Spain): the Peculiar Case of the October 2011 Eruption : Volume 3, Issue 2 (01/12/2011). Retrieved from http://worldebookfair.com/


Description
Description: Dept. of Earth Sciences, CEMPEG, Uppsala University, Sweden. The eruption that started off the south coast of El Hierro, Canary Islands, in October 2011 has emitted intriguing eruption products found floating in the sea. These specimens appeared as floating volcanic bombs that have in the meantime been termed restingolites (after the close-by village of La Restinga) and exhibit cores of white and porous pumice-like material. Currently the nature and origin of these floating stones is 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 collected and analysed the structure and composition of samples and compared the results to previous work on similar rocks found in the archipelago. Based on their high silica content, the lack of igneous trace element signatures, and the presence of remnant quartz crystals, jasper fragments and carbonate relicts, we conclude that restingolites are in fact xenoliths from pre-island sedimentary rocks that were picked up and heated by the ascending magma causing them to partially melt and vesiculate. They hence represent messengers from depth that help us to understand the interaction between ascending magma and crustal lithologies in 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 these restingolites does therefore not indicate the presence of an explosive high-silica magma that is involved in the ongoing eruption.

Summary
Floating sandstones off El Hierro (Canary Islands, Spain): the peculiar case of the October 2011 eruption

Excerpt
Aparicio, A., Bustillo, M. A., Garcia, R., and Araña, V.: Metasedimentary xenoliths in the lavas of the Timanfaya eruption (1730-1736, Lanzarote, Canary Islands): metamorphism and contamination processes, Geol. Mag., 143, 181–193, 2006.; Aparicio, A., Tassinari, C. C. G., Garcia, R., and Araña, V.: Sr and Nd isotope composition of the metamorphic, sedimentary and ultramafic xenoliths of Lanzarote (Canary Islands): Implications for magma sources, J. Volcanol. Geotherm. Res., 189, 143–150, 2010.; Araña, V. and Ibarrola, E.: Rhyolitic pumice in the basaltic pyroclasts from the 1971 eruption of Teneguía volcano, Canary Islands, Lithos 6, 273–278, 1973.; Berg, S.: Constraining crustal volatile release in magmatic conduits by synchrotron X-ray μ-CT. Examensarbete vid Institutionen för geovetenskaper, Uppsala Universitet, ISSN 1650-6553, Nr. 225, 2011.; Krastel, S. and Schmincke, H.-U.: Crustal structure of northern Gran Canaria deduced from active seismic tomography, J. Volcanol. Geotherm. Res., 115, 153–177, 2002; Carracedo, J. C., Rodríguez Badiola, E., Guillou, H., De La Nuez, J., and Pérez Torrado, F. J.: Geology and volcanology of La Palma and el Hierro, Western Canaries, Estudios Geológicos, 57, 1–124, 2001.; Coello, J. J.: Sobre el origen de la 'restingolita', Actualidad Volcánica de Canarias- Noticias, 10 Oct 2011, http://www.avcan.org/?m=Noticias&N=911, 2011.; Collier, J. S. and Watts, A. B.: Lithospheric response to volcanic loading by the Canary Islands: constraints from seismic reflection data in their flexural moat, Geophys. J. Int., 147, 660–676, 2001.; Criado, C. and Dorta, P.: An unusual `blood rain' over the Canary Islands (Spain) The storm of January 1999, J. Arid. Environ., 55, 765–783, 1999.; Gee, M. J. R., Masson, D. G., Watts, A. B., and Allen, P. A.: The Saharan debris flow: an insight into the mechanism of long runout submarine debris flows, Sedimentology 46, 317–335, 1999.; Gimeno, D.: Informe realizado para el Ayuntamiento de El Pinar, El Hierro, Islas Canarias, sobre un piroclasto de la erupción en curso, Internal report, 10 Oct 2011.; Guillou, H., Carracedo, J. C., Pérez Torrado, F. J., and Rodríguez Badiola, E.: K-Ar ages and magnetic stratigraphy of a hotspot-induced, fast grown oceanic island: El Hierro, Canary Islands, J. Volcanol. Geotherm. Res., 73, 141–155, 1996.; Hammer, J. E., Cashman, K. V., Hoblitt, R. P., and Newman, S.: Degassing and microlite crystallization during pre-climactic events of the 1991 eruption of Mt. Pinatubo, Philippines. Bull. Volcanol., 60, 355–380, 1999.; Hansteen, T. H. and Troll, V. R.: Oxygen isotope composition of xenoliths from the oceanic crust and volcanic edifice beneath Gran Canaria (Canary Islands): consequences for crustal contamination of ascending magmas, Chem. Geol., 193, 181–193, 2003.; Hansteen, T. H., Klügel, A., and Schmincke, H.: Multi-stage magma ascent beneath the Canary Islands: evidence from fluid inclusions, Contrib. Mineral. Petrol., 132, 48–64, 1998.; Hoernle, K. A.: Geochemistry of Jurassic ocean crust beneath Gran Canaria (Canary Islands): implications for crustal recycling and assimilation, J. Petrol., 39, 859–880, 1998.; IGN; Instituto Geográfico Nacional, Ministerio de Fomento, Servicio de Información Sísmica http://www.ign.es/ign/resources/volcanologia/HIERRO.html, 2011.; Klügel, A., Schmincke, H.-U., White, J. D. L., and Hoernle, K. A.: Chronology and volcanology of the 1949 multi-vent rift-zone eruption on la Palma (Canary Islands), J. Volcanol. Geotherm. Res., 94, 267–282, 1999.; McLeod, P. and Sparks, R. S. J.: The dynamics of xenolith assimilation, Contrib. Mineral. Petrol., 132, 21–33, 1998.; Pellicer, J. M.: Estudio geoquímico del vulcanismo de la isla del Hierro, Archipiélago Canario, Estudios Geol., 35, 15–29, 1979.; Perugini, D., Poli, G., Petrelli, M., De Campos C

 

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