Natural tracers for identifying the origin of the thermal fluids emerging along the Aegean Volcanic arc (Greece): Evidence of Arc-Type Magmatic Water (ATMW) participation

Ḏotsika, Elissavet; Poutoukis, D.; Michelot, Jean‐Luc; Raco, Brunella

doi:10.1016/j.jvolgeores.2008.09.024

Cited by 58 publications

(51 citation statements)

References 34 publications

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“…In this way, the values obtained for the PGL of Methana are: δ 2 H=−17.22‰, δ 18 O=−0.95‰ and Cl − = 16,000 mg/L. These values are a bit different from those proposed by Dotsika et al (2009). However, in that study, the samples from the area of Methana were only three.…”

Section: Stable Isotopescontrasting

confidence: 63%

“…The latter can be estimated in 34-40% considering a composition of 8 R/Ra of the He of the mantle end-member. The maximum 3 He/ 4 He ratios in the Aegean arc were found at Nisyros and are almost identical to the Sub Continental Lithospheric Mantle value (Shimizu et al, 2005;Dotsika et al, 2009).…”

Section: Stable Isotopesmentioning

confidence: 54%

“…The parent hydrothermal liquid is a mixture of local groundwater (∼ 43%), seawater (∼34%) and arc-type magmatic water (∼ 23%). It is likely that the magmatic contribution to the deep geothermal system in Methana is not very high like to Nisyros and Milos Islands (Dotsika et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…Mixing of arc-type magmatic water and seawater is observed in Nisyros Island in Greece (Chiodini et al, 1993;Dotsika and Michelot, 1993;Brombach et al, 2003), Milos, Santorini and Sousaki area (Dotsika et al, 2009).…”

Section: Stable Isotopesmentioning

confidence: 99%

“…This paper investigates the origin of thermal waters at Methana and Loutraki and of their mineralization and the temperatures of deep geothermal reservoirs. This study advances furthermore in relation to the study of Dotsika et al (2009), as it has incorporated a complete series of samples for a wider area in Methana. The older publication dealt with only three samples for the specific region, which also carried a great analytical uncertainty, as mentioned then.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Fluid geochemistry of the Methana Peninsula and Loutraki geothermal area, Greece

Ḏotsika

Poutoukis

Raco

2010

Journal of Geochemical Exploration

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Section: Stable Isotopescontrasting

confidence: 63%

Section: Stable Isotopesmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Stable Isotopesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fluid geochemistry of the Methana Peninsula and Loutraki geothermal area, Greece

Ḏotsika

Poutoukis

Raco

2010

Journal of Geochemical Exploration

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New mafic magma refilling a quiescent volcano: Evidence from He-Ne-Ar isotopes during the 2011-2012 unrest at Santorini, Greece

Rizzo

Barberi

Carapezza

et al. 2015

Geochem. Geophys. Geosyst.

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In 2011-2012, Santorini was characterized by seismic-geodetic-geochemical unrest, which was unprecedented since the most-recent eruption occurred in 1950 and led to fear an eruption was imminent. This unrest offered a chance for investigating the processes leading to volcanic reactivation and the compositional characteristics of involved magma. We have thus analyzed the He-Ne-Ar-isotope composition of fluid inclusions in olivines and clinopyroxenes from cumulate mafic enclaves hosted in cogenetic dacitic lavas of the 1570-1573 and 1925-1928 eruptions of Nea Kameni. These unique data on Aegean volcanism were compared with those of gases collected in quiescent periods and during the unrest. The 3 He/ 4 He ratios (3.1-4.0 Ra) are significantly lower than the typical arc-volcano values (R/Ra $ 7-8), suggesting the occurrence of magma contamination in Santorini plumbing system, which would further modify the 3 He/ 4 He ratio of parental magmas generated in the local metasomatized mantle. The 3 He/ 4 He values of enclaves (3.1-3.6 Ra) are comparable to those measured in gases during quiescent periods, confirming that enclaves reflect the He-isotope signature of magma residing at shallow depths and feeding passive degassing. A significant increase in soil CO 2 flux from Nea Kameni and anomalous compositional variations in the fumaroles were identified during the unrest, accordingly with previous studies. Simultaneously, 3 He/ 4 He ratios up to 4.0 Ra were also measured, demonstrating that the unrest was due to the intrusion into the shallow plumbing system of a more-primitive 3 He-rich magma, which is even volatile richer and less contaminated than mafic magma erupted as enclaves. This new intrusion did not however trigger an eruption.

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The Hydrothermal System and Geothermal Activity

Dietrich

Chiodini

Schwandner

2017

Active Volcanoes of the World

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Natural tracers for identifying the origin of the thermal fluids emerging along the Aegean Volcanic arc (Greece): Evidence of Arc-Type Magmatic Water (ATMW) participation

Cited by 58 publications

References 34 publications

Fluid geochemistry of the Methana Peninsula and Loutraki geothermal area, Greece

Fluid geochemistry of the Methana Peninsula and Loutraki geothermal area, Greece

New mafic magma refilling a quiescent volcano: Evidence from He-Ne-Ar isotopes during the 2011-2012 unrest at Santorini, Greece

The Hydrothermal System and Geothermal Activity

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