The output of CO2 from diffuse soil degassing has been estimated in the surrounding areas of the Kozhuh sub-volcanic body, located along the Strymon Valley in SW Bulgaria. The rocks of this cryptodome are related to the latest volcanic event in Bulgaria, which occurred about 12.2 Ma years ago. To the best of our knowledge, these are the very first CO2 measurements carried out in Bulgaria by the accumulation chamber method. In July 2014, 238 soil gas flux measurements east of the Kozhuh remnants were carried out covering a surface of about 173,000 m2. The study area also includes an artesian well and a spring discharging 35 L sec-1 of CO2-rich water at the temperature of about 75 °C. The total diffuse CO2 output has been computed using a statistical approach and results to be 3.24 t day-1, with the upper and lower limits at 95% confidence being of 3.71 and 2.9 t day-1, respectively. The significantly high CO2 flux values, mostly located in the eastern border of the study area, the CO2-rich thermal waters and the 150 m thick travertine deposit, presently non active, situated in the northern sector of Kozhuh can possibly suggest the presence of a long-lasting degassing hydrothermal system, which has been active since the emplacement of the Kozhuh cryptodome. This may suggest that the recorded anomalies of the diffuse CO2 fluxes are partly fed by thermometamorphic CO2, similar to that discharging from the thermal waters.

Diffuse CO2 soil flux measurements at the youngest volcanic system in Bulgaria: The 12.2 Ma old Kozhuh Cryptodome

Nisi B;Vaselli O;
2013

Abstract

The output of CO2 from diffuse soil degassing has been estimated in the surrounding areas of the Kozhuh sub-volcanic body, located along the Strymon Valley in SW Bulgaria. The rocks of this cryptodome are related to the latest volcanic event in Bulgaria, which occurred about 12.2 Ma years ago. To the best of our knowledge, these are the very first CO2 measurements carried out in Bulgaria by the accumulation chamber method. In July 2014, 238 soil gas flux measurements east of the Kozhuh remnants were carried out covering a surface of about 173,000 m2. The study area also includes an artesian well and a spring discharging 35 L sec-1 of CO2-rich water at the temperature of about 75 °C. The total diffuse CO2 output has been computed using a statistical approach and results to be 3.24 t day-1, with the upper and lower limits at 95% confidence being of 3.71 and 2.9 t day-1, respectively. The significantly high CO2 flux values, mostly located in the eastern border of the study area, the CO2-rich thermal waters and the 150 m thick travertine deposit, presently non active, situated in the northern sector of Kozhuh can possibly suggest the presence of a long-lasting degassing hydrothermal system, which has been active since the emplacement of the Kozhuh cryptodome. This may suggest that the recorded anomalies of the diffuse CO2 fluxes are partly fed by thermometamorphic CO2, similar to that discharging from the thermal waters.
2013
Istituto di Geoscienze e Georisorse - IGG - Sede Pisa
Kozhuh
Strymon Valley
CO2 flux
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/336973
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