کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4677887 1634820 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A stress-controlled mechanism for the intensity of very large magnitude explosive eruptions
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
A stress-controlled mechanism for the intensity of very large magnitude explosive eruptions
چکیده انگلیسی

Large magnitude explosive eruptions are the result of the rapid and large-scale transport of silicic magma stored in the Earth's crust, but the mechanics of erupting teratonnes of silicic magma remain poorly understood. Here, we demonstrate that the combined effect of local crustal extension and magma chamber overpressure can sustain linear dyke-fed explosive eruptions with mass fluxes in excess of 1010 kg/s from shallow-seated (4–6 km depth) chambers during moderate extensional stresses. Early eruption column collapse is facilitated with eruption duration of the order of few days with an intensity of at least one order of magnitude greater than the largest eruptions in the 20th century. The conditions explored in this study are one way in which high mass eruption rates can be achieved to feed large explosive eruptions. Our results corroborate geological and volcanological evidences from volcano-tectonic complexes such as the Sierra Madre Occidental (Mexico) and the Taupo Volcanic Zone (New Zealand).


► We modeled effect of crustal extension on intensity of explosive dyke-fed eruptions.
► Extensional stress control permits large mass fluxes to be erupted through dykes.
► Huge amounts of magma can be erupted in few days favoring column collapse conditions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 310, Issues 1–2, 1 October 2011, Pages 161–166
نویسندگان
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