Origin of the gases released from the Acqua Passante and Ermeta wells (Mt. Amiata, central Italy) and possible environmental implications for their closure

Nisi, Bárbara and Vallesi, Orlando and Tassi, Franco and Elio Medina, Javier de and Ortega Romero, Marcelo and Caballero, Juan and Rappuoli, Daniele and Mazadiego Martínez, Luis Felipe (2014). Origin of the gases released from the Acqua Passante and Ermeta wells (Mt. Amiata, central Italy) and possible environmental implications for their closure. "Annals of Geophysics", v. 57 (n. 4); pp.. ISSN 2037-416X. https://doi.org/10.4401/ag-6584.

Description

Title: Origin of the gases released from the Acqua Passante and Ermeta wells (Mt. Amiata, central Italy) and possible environmental implications for their closure
Author/s:
  • Nisi, Bárbara
  • Vallesi, Orlando
  • Tassi, Franco
  • Elio Medina, Javier de
  • Ortega Romero, Marcelo
  • Caballero, Juan
  • Rappuoli, Daniele
  • Mazadiego Martínez, Luis Felipe
Item Type: Article
Título de Revista/Publicación: Annals of Geophysics
Date: 2014
ISSN: 2037-416X
Volume: 57
Subjects:
Faculty: E.T.S.I. Minas (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The Mt. Amiata volcano (Tuscany, central Italy) hosts the second largest geothermal field of Italy. Its SW and NE sectors are characterized by the presence of several CO2-rich (mayor que95% by vol.) gas discharges. An intense Hg mining activity had taken place from the 19th century up to the end of the ?70s, particularly close to Abbadia San Salvatore, during which two drillings (Acqua Passante and Ermeta) intercepted a CO2-rich gas fertile horizon. The related gases are emitted in the atmosphere since 1938 and 1959, respectively, causing severe concerns for the local air quality. In this work the results of a geochemical and isotopic survey carried out on these gas emissions from March 2009 to January 2014 are presented. CO2 fluxes from both the two wells and soil from an area of about 653,500 m2 located between them were measured. The two wells are emitting up to 15,000, 92 and 8 tons y-1 of CO2, CH4 and H2S, respectively, while the computed soil CO2 output was estimated at 4,311 ton y-1. The spatial distribution of the CO2 soil flux suggests the presence of preferential patterns, indicating sites of higher permeability. Since the local municipality is evaluating the possibility to plug the Ermeta vent, a temporarily closure should first be carried out to test the possible influence of this operation on the diffuse soil degassing of deep-originated CO2 in the surrounding area. This implies that diffuse soil gases should carefully be monitored before proceeding with its definitive closure.

More information

Item ID: 30785
DC Identifier: http://oa.upm.es/30785/
OAI Identifier: oai:oa.upm.es:30785
DOI: 10.4401/ag-6584
Official URL: http://www.annalsofgeophysics.eu/index.php/annals/article/view/6584
Deposited by: Memoria Investigacion
Deposited on: 02 Sep 2014 06:24
Last Modified: 22 Apr 2016 01:02
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