Role of syn-eruptive plagioclase disequilibrium crystallization in basaltic magma ascent dynamics.

Abstract:

:Timescales of magma ascent in conduit models are typically assumed to be much longer than crystallization and gas exsolution for basaltic eruptions. However, it is now recognized that basaltic magmas may rise fast enough for disequilibrium processes to play a key role on the ascent dynamics. The quantification of the characteristic times for crystallization and exsolution processes are fundamental to our understanding of such disequilibria and ascent dynamics. Here we use observations from Mount Etna's 2001 eruption and a magma ascent model to constrain timescales for crystallization and exsolution processes. Our results show that plagioclase reaches equilibrium in 1-2 h, whereas ascent times were <1 h. Using these new constraints on disequilibrium plagioclase crystallization we also reproduce observed crystal abundances for different basaltic eruptions. The strong relation between magma ascent rate and disequilibrium crystallization and exsolution plays a key role in controlling eruption dynamics in basaltic volcanism.

journal_name

Nat Commun

journal_title

Nature communications

authors

La Spina G,Burton M,De' Michieli Vitturi M,Arzilli F

doi

10.1038/ncomms13402

subject

Has Abstract

pub_date

2016-12-12 00:00:00

pages

13402

issn

2041-1723

pii

ncomms13402

journal_volume

7

pub_type

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