A CO2-gas precursor to the March 2015 Villarrica volcano eruption

被引：58

作者：

Aiuppa, Alessandro ^{[1
,2
]}

Bitetto, Marcello ^{[1
]}

Francofonte, Vincenzo ^{[2
]}

Velasquez, Gabriela ^{[3
]}

Parra, Claudia Bucarey ^{[3
]}

Giudice, Gaetano ^{[2
]}

Liuzzo, Marco ^{[2
]}

Moretti, Roberto ^{[4
]}

Moussallam, Yves ^{[5
]}

Peters, Nial ^{[5
]}

Tamburello, Giancarlo ^{[1
,6
]}

Valderrama, Oscar. A. ^{[3
]}

Curtis, Aaron ^{[7
]}

机构：

[1] Univ Palermo, Dipartimento DiSTeM, Palermo, Italy

[2] Ist Nazl Geofis & Vulcanol, Sez Palermo, Palermo, Italy

[3] Observ Vulcanol Andes OVDAS, Serv Nacl Geol & Min, Temuco, Chile

[4] Edilizia & Ambiente Seconda Univ Napoli, Dipartimento Ingn Civile Design, Naples, Italy

[5] Univ Cambridge, Dept Geog, Downing Pl, Cambridge, England

[6] Ist Nazl Geofis & Vulcanol, Sez Bologna, Bologna, Italy

[7] New Mexico Inst Min & Technol, Dept Earth & Environm Sci, Socorro, NM 87801 USA

来源：

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS | 2017年 / 18卷 / 06期

关键词：

volcanic gases; multi-GAS; precursor CO2; SO2; variations; Villarrica volcano; lava lakes; ERTA ALE VOLCANO; LAVA LAKE; GAS MEASUREMENTS; OXIDATION-STATE; EREBUS VOLCANO; ARC VARIATIONS; ALONG-ARC; FLUCTUATIONS; DYNAMICS; MAGMAS;

D O I：

10.1002/2017GC006892

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

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 approximate 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.

引用

页码：2120 / 2132

页数：13

共 77 条

[1] Chemical mapping of a fumarolic field: La Fossa Crater, Vulcano Island (Aeolian Islands, Italy) [J].