Natural Degassing of Carbon Dioxide and Hydrogen Sulphide and Its Environmental Impact at Milos Island, Greece

Kyriakopoulos, G.K.

doi:10.12681/bgsg.11636

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…Due to this specific geological background, conditions for the formation of many thermal springs were favoured (D'Alessandro et al, 2006(D'Alessandro et al, , 2008(D'Alessandro et al, , 2010(D'Alessandro et al, , 2011Kyriakopoulos et al, 2010). The major geodynamic activity in macroscale gave rise to a geological evolution which is expressed in volcanism, orogenetic processes and active tectonics.…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of the Gas Manifestations of Greece: Methane and Light Hydrocarbons

et al. 2017

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Greece has a very complex geodynamic setting deriving from a long and complicated geological history being characterized by intense seismic activity and enhanced geothermal gradient. This activity, with the contribution of an active volcanic arc, favours the existence of many gas manifestations. Depending on the prevailing gas species, the latter can be subdivided in three main groups: CO2-, N2- and CH4- dominated. In the present work, we focus on methane and light hydrocarbons (C2-C6) to define their origin. CH4 concentrations (<2 to 915,200 μmol/mol) and isotopic ratios (δ13C -79.8 to +16.9 ‰, δD -298 to +264‰) cover a wide range of values indicating different origins and/or secondary post-genetic processes. Samples from gas discharged along the Ionian coast and in northern Aegean Sea have a prevailing microbial origin. Cold and thermal gas manifestations of central and northern Greece display a prevalent thermogenic origin. Methane in gases released along the active volcanic arc is prevailingly abiogenic, although thermogenic contributions cannot be excluded. Gases collected in the geothermal areas of Sperchios basin and northern Euboea are likely affected by strong secondary oxidation processes, as suggested by their highly positive C and H isotopic values (up to +16.9‰ and +264‰ respectively) and low C1/(C2+C3) ratios.

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Section: Introductionmentioning

confidence: 99%

Geochemistry of the Gas Manifestations of Greece: Methane and Light Hydrocarbons

et al. 2017

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“…In the current study, a total of 122 data from submarine gas manifestations are presented. This dataset comprises both literature (Chiodini et al, 1998;Shimizu et al, 2005;Kyriakopoulos, 2010;Carey et al, 2013;Tassi et al, 2013;Rizzo et al, 2016Rizzo et al, , 2019Daskalopoulou et al, 2018aDaskalopoulou et al, ,b, 2019bDaskalopoulou et al, , 2021aTarchini et al, 2019) and 7 unpublished results from submarine degassing areas distributed in ten areas of the Aegean Sea; seven of which belong to the SAAVA. Gases were collected using the inverted funnel method (Figure 5).…”

Section: Geochemistry Of Submarine Gas Ventsmentioning

confidence: 99%

Shallow Sea Gas Manifestations in the Aegean Sea (Greece) as Natural Analogs to Study Ocean Acidification: First Catalog and Geochemical Characterization

et al. 2022

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The concepts of CO2 emission, global warming, climate change, and their environmental impacts are of utmost importance for the understanding and protection of the ecosystems. Among the natural sources of gases into the atmosphere, the contribution of geogenic sources plays a crucial role. However, while subaerial emissions are widely studied, submarine outgassing is not yet well understood. In this study, we review and catalog 122 literature and unpublished data of submarine emissions distributed in ten coastal areas of the Aegean Sea. This catalog includes descriptions of the degassing vents through in situ observations, their chemical and isotopic compositions, and flux estimations. Temperatures and pH data of surface seawaters in four areas affected by submarine degassing are also presented. This overview provides useful information to researchers studying the impact of enhanced seawater CO2 concentrations related either to increasing CO2 levels in the atmosphere or leaking carbon capture and storage systems.

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Boiling effects on trace element and sulfur isotope compositions of sulfides in shallow-marine hydrothermal systems: Evidence from Milos Island, Greece

et al. 2021

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Natural Degassing of Carbon Dioxide and Hydrogen Sulphide and Its Environmental Impact at Milos Island, Greece

Abstract: The

Cited by 5 publications

References 16 publications

Geochemistry of the Gas Manifestations of Greece: Methane and Light Hydrocarbons

Geochemistry of the Gas Manifestations of Greece: Methane and Light Hydrocarbons

Shallow Sea Gas Manifestations in the Aegean Sea (Greece) as Natural Analogs to Study Ocean Acidification: First Catalog and Geochemical Characterization

Boiling effects on trace element and sulfur isotope compositions of sulfides in shallow-marine hydrothermal systems: Evidence from Milos Island, Greece

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