TY  - JOUR
IS  - 6
KW  - volcanic gases
KW  -  multi?GAS precursor
KW  -  CO2/SO2 variations
KW  -  Villarrica volcano
KW  -  lava lakes
JF  - Geochemistry, Geophysics, Geosystems
AV  - public
SN  - 1525-2027
SP  - 2120
ID  - discovery10076611
N2  - We present here the first volcanic gas compositional time?series taken prior to a paroxysmal eruption of Villarrica volcano (Chile). Our gas plume observations were obtained using a fully autonomous Multi?component Gas Analyser System (Multi?GAS) in the 3 month?long phase of escalating volcanic activity that culminated into the 3 March 2015 paroxysm, the largest since 1985. Our results demonstrate a temporal evolution of volcanic plume composition, from low CO2/SO2 ratios (0.65?2.7) during November 2014?January 2015 to CO2/SO2 ratios up to ? 9 then after. The H2O/CO2 ratio simultaneously declined to <38 in the same temporal interval. We use results of volatile saturation models to demonstrate that this evolution toward CO2?enriched gas was likely caused by unusual supply of deeply sourced gas bubbles. We propose that separate ascent of over?pressured gas bubbles, originating from at least 20?35 MPa pressures, was the driver for activity escalation toward the 3 March climax.
EP  - 2132
A1  - Aiuppa, A
A1  - Bitetto, M
A1  - Francofonte, V
A1  - Velasquez, G
A1  - Parra, CB
A1  - Giudice, G
A1  - Liuzzo, M
A1  - Moretti, R
A1  - Moussallam, Y
A1  - Peters, N
A1  - Tamburello, G
A1  - Valderrama, OA
A1  - Curtis, A
VL  - 18
UR  - https://doi.org/10.1002/2017GC006892
Y1  - 2017/06//
TI  - A CO2-gas precursor to the March 2015 Villarrica volcano eruption
N1  - This version is the version of record. For information on re-use, please refer to the publisher?s terms and conditions.
PB  - AMER GEOPHYSICAL UNION
ER  -