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'Inheritance': An influence on the particle size of pyroclastic deposits


Carey, RJ and Houghton, BF, 'Inheritance': An influence on the particle size of pyroclastic deposits, Geology (Boulder), 38, (4) pp. 347-350. ISSN 0091-7613 (2010) [Refereed Article]

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Copyright Statement

Copyright 2010 Geological Society of America

DOI: doi:10.1130/G30573.1


The size distribution of particles in pyroclastic fall deposits has been interpreted as a strong indication of efficiency of the fragmentation process during the parent explosions. Fall deposits, however, contain two distinct populations of pyroclasts: juvenile, i.e., magmatic clasts fragmented from the magma, and wall-rock particles derived from walls of the vent and volcanic conduit. While sizes and shapes of the former are always sensitive indicators of eruptive processes, properties of the wall-rock population may reflect various external influences. Here we describe how the wall-rock component of a powerful historical eruption largely inherited its size distribution from properties of the host rocks, and how this, in turn, strongly biases the entire deposit grain size distribution of the near-vent deposits. The use of wall-rock particles to infer style of fragmentation and eruption must always be coupled with other independent lines of evidence. © 2010 Geological Society of America.

Item Details

Item Type:Refereed Article
Keywords:Particle Size, Pyroclastic Deposits, Grain size, Explosive eruptions
Research Division:Earth Sciences
Research Group:Geology
Research Field:Volcanology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Carey, RJ (Associate Professor Rebecca Carey)
ID Code:76571
Year Published:2010
Web of Science® Times Cited:14
Deposited By:Earth Sciences
Deposited On:2012-03-08
Last Modified:2012-07-03

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