کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4714754 | 1638453 | 2008 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Single explosions at Stromboli in 2002: Use of clast microtextures to map physical diversity across a fragmentation zone
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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چکیده انگلیسی
A combination of fortuitous eruptive and wind conditions at Stromboli volcano in September 2002 enabled the collection of samples of multiple lapilli from individual observed explosions. These ejecta present the first opportunity to analyze the vesicularity of material ejected in a single Strombolian explosion. Samples of between 40 and 92 lapilli were collected from each of six sequential explosions on 30 September 2002, and 28 lapilli were obtained from a single explosion â¼Â 24 h later (1 October). Density measurements and microtextural observations show that considerable heterogeneity existed within each of the seven samples. Centimeter to millimeter size bubble-rich and bubble-poor zones are present and are, in places, mingled together. These data confirm that the shallow conduit at Stromboli is a texturally diverse environment at the instant of a single explosion, and that a similar range of heterogeneity can persist through closely-spaced sequences of explosions on a timescale of hours and, probably, days, despite the dynamic processes of ascent of melt and decoupled gas phases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Volcanology and Geothermal Research - Volume 170, Issues 3â4, 10 March 2008, Pages 262-268
Journal: Journal of Volcanology and Geothermal Research - Volume 170, Issues 3â4, 10 March 2008, Pages 262-268
نویسندگان
Nicole C. Lautze, Bruce F. Houghton,