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Chemical characterisation of the gases released at Gyali Island, Dodecanese, Greece and preliminary estimation of the CO (sub 2) output

Kyriaki Daskalopoulou, Sergio Calabrese, Antonina Lisa Gagliano, Konstantinos Kyriakopoulos, Lorenza Li Vigni, Manfredi Longo, Giovannella Pecoraino and Walter D'Alessandro
Chemical characterisation of the gases released at Gyali Island, Dodecanese, Greece and preliminary estimation of the CO (sub 2) output
Italian Journal of Geosciences (February 2021) 140 (1): 16-28

Abstract

Greece belongs to the most geodynamically active regions of the world and as such, it has to be considered an area of intense geogenic degassing. In terms of carbon, the territory is characterized by the high hydrothermal and volcanic activity of the South Aegean Active Volcanic Arc (SAAVA), and by widespread geological seeps of buried carbon dioxide and methane. In the present work, we investigate the island of Gyali located in the volcanic system Kos-Gyali-Nisyros. Nine gas samples have been collected on the island of Gyali in areas found both on land, in a small lake ( approximately 2000 m2) along its beach, and in the sea close to the shore at shallow depths (<20 m). Results show that CO (sub 2) is the prevailing gas species with concentrations above 833,000 mu mol/mol, whilst minor enrichments in N2 are noticed in some of the samples. Helium isotope ratio suggests an up to 70% mantle origin (considering a MOR type source) with the contribution of the atmospheric component being negligible, whereas C presents a mixed mantle-limestone origin with organic sediment being unimportant. Such isotope values fall in the range that characterizes the Kos-Gyali-Nisyros Volcanic Field. First estimations on the CO (sub 2) release suggest an output in the range from 18 to 28 t/d for Gyali Island, which is much lower than the total output of Kos approximately 75 t/d and Nisyros approximately 100 t/d. However, such results highlight that Gyali is an active system and, despite its small size, its degassing is not trivial.


ISSN: 2038-1719
EISSN: 2038-1727
Coden: BOGIAT
Serial Title: Italian Journal of Geosciences
Serial Volume: 140
Serial Issue: 1
Title: Chemical characterisation of the gases released at Gyali Island, Dodecanese, Greece and preliminary estimation of the CO (sub 2) output
Affiliation: GFZ German Research Centre for Geosciences, Physics of Earthquakes and Volcanoes, Potsdam, Germany
Pages: 16-28
Published: 202102
Text Language: English
Publisher: Societa Geologica Italiana, Rome, Italy
References: 76
Accession Number: 2021-048720
Categories: Isotope geochemistryQuaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N36°39'46" - N36°39'46", E27°07'10" - E27°07'10"
Secondary Affiliation: Universita di Palermo, ITA, ItalyIstituto Nazionale di Geofisica e Vulcanologia, ITA, ItalyNational and Kapodistrian University of Athens, GRC, Greece
Country of Publication: Italy
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Abstract, Copyright, Societa Geologica Italiana. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2021
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