scholarly journals The Role of Magma Storage Conditions and Excess Fluids in the Effusive to Explosive Eruption Styles

2021 ◽  
Author(s):  
Sri Budhi Utami ◽  
Joan Andujar ◽  
Fidel Costa ◽  
Bruno Scaillet ◽  
Hanik Humaida
2020 ◽  
Author(s):  
Thiebaut d'Augustin ◽  
Hélène Balcone-Boissard ◽  
Georges Boudon ◽  
Caroline Martel ◽  
Etienne Deloule ◽  
...  

<p>Dominica island experienced the largest explosive eruptions (ignimbrites) of the Lesser Antilles arc. The recent revised chronostratigraphy of the Morne Trois Pitons – Micotrin eruptive activity evidenced a series of plinian eruptions that occurred between 18 ka and 9 ka BP. Here we focus on these recent eruptions in order to determine the magma storage conditions at depth and volatile degassing budget. Volatile concentrations (H<sub>2</sub>O, CO<sub>2</sub>) in melt inclusions indicate storage conditions of 200 MPa (~6-8 km deep) and 860-880°C in agreement with experimental constraints from phase-equilibrium data. The magmas were thus stored shallower than those involved during the ignimbritic eruptions (~16 km deep). Magma composition and halogen ratios suggest a common magma origin for all eruptions of Morne Trois Pitons Micotrin volcano in the last 60 kyrs. In addition, for the first time, a complete degassing budget including H<sub>2</sub>O, CO<sub>2</sub>, SO<sub>2</sub>, F, Cl, and Br has been established for all these explosive eruptions. The estimation of their eruptive fluxes towards the atmosphere supports the potential important role of halogen elements in the modification of atmosphere chemistry. Br degassing budget was the same order of magnitude as S whereas F and Cl budgets were 1 and 2 orders of magnitude higher than these two species.</p>


2021 ◽  
Vol 14 (10) ◽  
pp. 781-786
Author(s):  
Răzvan-Gabriel Popa ◽  
Olivier Bachmann ◽  
Christian Huber

Author(s):  
Allison Rubin ◽  
Kari M. Cooper ◽  
Marissa Leever ◽  
Josh Wimpenny ◽  
Chad Deering ◽  
...  

2013 ◽  
Vol 54 (6) ◽  
pp. 1071-1107 ◽  
Author(s):  
C. Martel ◽  
R. Champallier ◽  
G. Prouteau ◽  
M. Pichavant ◽  
L. Arbaret ◽  
...  

1998 ◽  
Vol 156 (1-2) ◽  
pp. 89-99 ◽  
Author(s):  
C MARTEL ◽  
M PICHAVANT ◽  
J BOURDIER ◽  
H TRAINEAU ◽  
F HOLTZ ◽  
...  

2014 ◽  
Vol 55 (4) ◽  
pp. 749-767 ◽  
Author(s):  
Duncan D. Muir ◽  
Jon D. Blundy ◽  
Alison C. Rust ◽  
James Hickey

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