Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9087
AuthorsPorreca, M.* 
Cifelli, F.* 
Soriano, C.* 
Giordano, G.* 
Romano, C.* 
Conticelli, S.* 
Massimo, M.* 
TitleHyaloclastite fragmentation below the glass transition: An example from El Barronal submarine volcanic complex (Spain)
Issue Date10-Feb-2014
Series/Report no./42 (2014)
DOI10.1130/G34744.1
URIhttp://hdl.handle.net/2122/9087
Keywordshyaloclastite
volcanic fragmentation
thermal magnetization
Cabo de Gata
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks 
AbstractSubmarine felsic volcanoes are dominated by hyaloclastic piles hundreds of meters thick, the origin of which, in terms of how and when they form, is far from being completely understood. Here we present a study of the thermal remanent magnetization of the Miocene high-K dacitic El Barronal hyaloclastites (Cabo de Gata, Spain), showing that their formation is dominated by in situ fragmentation with small or negligible transportation and/or rotation of different clasts after their formation. Data indicate that fragmentation progressed down to 210–390 °C, well below the glass-transition temperature estimated at 560–750 ºC depending on the water content of the high-K dacite. Hence, hyaloclastite fragmentation in thick lavas may occur over most of the cooling history, as a result of the progressive access of sea water toward the lava interior by development of a complex network of contraction fractures.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
Porreca al (2014) Hyaloclastite fragmentation GEOLOGY.pdfmain article576.6 kBAdobe PDFView/Open    Request a copy
Show full item record

Page view(s)

177
checked on Apr 29, 2017

Download(s)

45
checked on Apr 29, 2017

Google ScholarTM

Check

Altmetric