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Cooling rates of hyaloclastites : applications of relaxation geospeedometry to undersea volcanic deposits.

Wilding, Martin and Dingwell, Donald and Batiza, Rodey and Wilson, Lionel (2000) Cooling rates of hyaloclastites : applications of relaxation geospeedometry to undersea volcanic deposits. Bulletin of Volcanology, 61 (8). pp. 527-536. ISSN 1432-0819

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Abstract

Glass fragments from three different hyaloclastites have been used to evaluate the range of cooling rates experienced by undersea volcanic deposits. We found that the glass fragments retain structures with a range of apparent quench rates from 25 to 0.15 K min–1. The most rapid cooling rates are interpreted to be those resulting from cooling of the lava near the water interface. Simple conductive cooling models produce a range of quench rates comparable to those of the more rapidly cooled samples. The very slow apparent quench rates are unlikely to result from simple linear cooling through the glass transition, because of the onset of crystallization; instead, they are indicators of a more complex thermal history that involves the annealing of glasses at temperatures within the glass transition interval for a dwell time sufficient to allow the relaxation of the glass to lower temperature structures. The thermal history recorded in these samples illustrates the complexity of eruptive processes and demonstrates that quench rates for natural glasses retain information relevant to more complex cooling models.

Item Type: Article
Journal or Publication Title: Bulletin of Volcanology
Uncontrolled Keywords: Hyaloclastite - Quench rate - Thermal history - Thermal buffering
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21672
Deposited By: ep_ss_importer
Deposited On: 23 Jan 2009 15:01
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:50
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21672

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