A carbon-rich lithospheric mantle as a source for the large CO2 emissions of Etna volcano (Italy)

被引：26

作者：

Bragagni, Alessandro ^{[1
,2
]}

Mastroianni, Filippo ^{[2
,3
]}

Muenker, Carsten ^{[1
]}

Conticelli, Sandro ^{[2
,4
]}

Avanzinelli, Riccardo ^{[2
,5
]}

机构：

[1] Univ Cologne, Inst Geol & Mineral, Zulpicher Str 49b, D-50674 Cologne, Germany

[2] Univ Firenze, Dipartimento Sci Terra, Via G La Pira 4, I-50121 Florence, Italy

[3] Univ Pisa, Dipartimento Sci Terra, Via Santa Maria 53, I-56126 Pisa, Italy

[4] CNR, Ist Geol Ambientale & Geoingn, Via Salaria 300, I-00015 Monterotondo, RM, Italy

[5] CNR, Ist Geosci & Georisorse, Via G La Pira 4, I-50121 Florence, Italy

来源：

GEOLOGY | 2022年 / 50卷 / 04期

基金：

欧洲研究理事会;

关键词：

MOUNT-ETNA; INTEGRATED MODEL; HYBLEAN PLATEAU; TRACE-ELEMENT; DEEP CARBON; METASOMATISM; CONSTRAINTS; BASALTS; NB/TA; ROCKS;

D O I：

10.1130/G49510.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Etna volcano in Italy releases an exceptional amount of CO2 (9083 t/day) and contributes to 10% of global volcanic emission. The reasons for its extreme CO2 degassing are not yet understood. Using high-precision high field strength element (HFSE) concentrations in magmas from volcanoes in southern Italy, we show that the high Nb/Ta of Etna (up to 26) reveals a mantle source affected by carbonatite metasomatism, which is likely responsible for the large CO2 fluxes. As observed at Etna, carbon-rich mantle domains influence CO2 degassing also outside of continental rifts and therefore play a fundamental role in explaining volcanic CO2 fluxes in different geodynamic settings. Collectively, our study demonstrates that HFSE ratios in magmatic rocks are viable tracers for volcanic carbon degassing that can be used to study present-day settings and, possibly, past emissions.

引用

页码：486 / 490

页数：5