%0 Journal Article
%T The Nuée Ardentes of Sabalan Volcano in Iran
%A Reza Fahim Guilany
%A Ali Darvishzadeh
%A Seyed Jamal Sheikhzakariaee
%J Open Journal of Geology
%P 1553-1566
%@ 2161-7589
%D 2016
%I Scientific Research Publishing
%R 10.4236/ojg.2016.612110
%X This article deals with the introduction and explanation of the two nu¨¦eardentes of ¡°Mue¡¯el Valley¡± and ¡°Shirvandareh Valley¡± which are one type of the pyroclastic flows of Sabalan volcano. One of the features of nu¨¦eardente in these two valleys is the presence of large blocks in upstream of valley and the abundance of ash in downstream which it has happened in one stage in Mue¡¯el and in several stages in Shirvandareh Valley. Considering the antiquity of the great Sabalan volcano and numerous changes that have happened during these long years in the region, determining the temperature of nu¨¦eardente was impossible. But what could be mentioned as a sign of high temperature because of nu¨¦eardente is the presence of rust ground mass on piece levels which indicate hot water steam (500<span style=\"white-space:nowrap;\">¡ã</span>C to 600<span style=\"white-space:nowrap;\">¡ã</span>C). Also puzzle breakings like those in these rocks should be the result of severe explosion blast and very fast movements of nu¨¦eardente that has broken these rocks instantly. These nu¨¦eardentes are pel¨¦an type and they are more or less synchronous, and the main reason could be the huge explosion which happened because of the second caldra¡¯s subsidence. By comparing deposits of the two nu¨¦eardentes of Mue¡¯el Valley and Shirvandareh Valley, it is observed that the extent, thickness, and size of blocks are higher in Shirvandareh than those in Mue¡¯el Valley. Also considering higher levels of pieces¡¯ adherence and hardness of deposits, it can be concluded that the temperature of this complex was higher than that of Mue¡¯el Valley, and in general the power of Shirvandareh¡¯s nu¨¦eardente is more than the Mue¡¯el Valley¡¯s.
%K Pyroclastic Flow
%K Nu&#233
%K e Ardente
%K Caldera
%K Dome Growth
%K Sabalan
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=72945