NissirosV1, PascalFrancis, Corpus, bibRecord, 000028

Variation in noble gas isotopic composition of gas samples from the Aegean arc, Greece

Identifieur interne : 000028 ( PascalFrancis/Corpus ); précédent : 000027; suivant : 000029

Variation in noble gas isotopic composition of gas samples from the Aegean arc, Greece

Auteurs : Aya Shimizu ; Hirochika Sumino ; Keisuke Nagao ; Kenji Notsu ; Panagiotis Mitropoulos

Source :

Journal of volcanology and geothermal research [ 0377-0273 ] ; 2005.

RBID : Pascal:05-0446407

Descripteurs français

Pascal (Inist)
- Gaz rare, Macédoine Grèce, Isotope, Iles Egée Grèce, Subduction, Sr 87-Sr 86, Volcan, Variation temporelle, Assimilation, Arc volcanique, Hélium, Croûte continentale, Magma, Manteau sup, Faible profondeur, Fumerolle, Source thermale, Activité, Magmatisme, Manteau sous continental, He 4-He 3, Hellénides, Ne 22-Ne 20, Gaz volcanique, Manteau lithosphérique, Ne 22-Ne 21, Ar 38-Ar 36, Ar 40-Ar 36, Xe 132, Kr 84.

English descriptors

KwdEn :
- Ar-38/Ar-36, Ar-40/Ar-36, Greek Aegean Islands, Greek Macedonia, He-4/He-3, Hellenides, Kr-84, Ne-22/Ne-20, Ne-22/Ne-21, Sr-87/Sr-86, Xe-132, activity, assimilation, continental crust, fumaroles, helium, hot springs, isotopes, magmas, magmatism, noble gases, shallow depth, subcontinental mantle, subduction, time variations, upper mantle, volcanic arcs, volcanoes.

Abstract

In contrast to most other arcs with oceanic plate subduction, the Aegean arc is characterized by continent-continent subduction. Noble gas abundances and isotopic compositions of 45 gas samples have been determined from 6 volcanoes along the arc, 2 islands in the back-arc region and 7 sites in the surrounding areas. The ³He/⁴He ratios of the samples ranged from 0.027R_A to 6.2R_A (R_A denotes the atmospheric ³He/⁴He ratio of 1.4 × 10^-6), demonstrating that even the maximum ³He/⁴He ratio in the region is significantly lower than the maximum ratios of most oceanic subduction systems, which are equal to the MORB value of 8±1 R_A. Regional variations in the ³He/⁴He ratio were observed both along and across the arc. The maximum ³He/⁴He ratio was obtained from Nisyros volcano located in the eastern end of the arc, and the ratio decreased westward possibly reflecting the difference in potential degree of crustal assimilation or the present magmatic activity in each volcano. Across the volcanic arc, the ³He/⁴He ratio decreased with an increasing distance from the arc front, reaching a low ratio of 0.063R_A in Macedonia, which suggested a major contribution of radiogenic helium derived from the continental crust. At Nisyros, a temporal increase in ³He/⁴He ratio due to ascending subsurface magma was observed after the seismic crisis of 1995-1998 and mantle neon was possibly detected. The maximum ³He/⁴He ratio (6.2R_A) in the Aegean region, which is significantly lower than the MORB value, is not probably due to crustal assimilation at shallow depth or addition of slab-derived helium to MORB-like mantle wedge, but inherent characteristics of the subcontinental lithospheric mantle (SCLM) beneath the Aegean arc.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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A14	`02`			`@1 Department of Geology, Faculty of Science, National University of Athens, Panepistimiopolis @2 Ano Ilisia, Athens 15784 @3 GRC @Z 5 aut.`
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C01	`01`		`ENG`	@0 In contrast to most other arcs with oceanic plate subduction, the Aegean arc is characterized by continent-continent subduction. Noble gas abundances and isotopic compositions of 45 gas samples have been determined from 6 volcanoes along the arc, 2 islands in the back-arc region and 7 sites in the surrounding areas. The ³He/⁴He ratios of the samples ranged from 0.027R_A to 6.2R_A (R_A denotes the atmospheric ³He/⁴He ratio of 1.4 × 10^-6), demonstrating that even the maximum ³He/⁴He ratio in the region is significantly lower than the maximum ratios of most oceanic subduction systems, which are equal to the MORB value of 8±1 R_A. Regional variations in the ³He/⁴He ratio were observed both along and across the arc. The maximum ³He/⁴He ratio was obtained from Nisyros volcano located in the eastern end of the arc, and the ratio decreased westward possibly reflecting the difference in potential degree of crustal assimilation or the present magmatic activity in each volcano. Across the volcanic arc, the ³He/⁴He ratio decreased with an increasing distance from the arc front, reaching a low ratio of 0.063R_A in Macedonia, which suggested a major contribution of radiogenic helium derived from the continental crust. At Nisyros, a temporal increase in ³He/⁴He ratio due to ascending subsurface magma was observed after the seismic crisis of 1995-1998 and mantle neon was possibly detected. The maximum ³He/⁴He ratio (6.2R_A) in the Aegean region, which is significantly lower than the MORB value, is not probably due to crustal assimilation at shallow depth or addition of slab-derived helium to MORB-like mantle wedge, but inherent characteristics of the subcontinental lithospheric mantle (SCLM) beneath the Aegean arc.
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C03	`04`	`2`	`SPA`	`@0 Islas Egeas Griegas @2 NG @5 04`
C03	`05`	`2`	`FRE`	`@0 Subduction @5 07`
C03	`05`	`2`	`ENG`	`@0 subduction @5 07`
C03	`05`	`2`	`SPA`	`@0 Subducción @5 07`
C03	`06`	`2`	`FRE`	`@0 Sr 87-Sr 86 @5 08`
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C03	`16`	`2`	`FRE`	`@0 Fumerolle @5 18`
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C03	`16`	`2`	`SPA`	`@0 Fumarola @5 18`
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C03	`17`	`2`	`ENG`	`@0 hot springs @5 19`
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C03	`18`	`2`	`FRE`	`@0 Activité @5 20`
C03	`18`	`2`	`ENG`	`@0 activity @5 20`
C03	`18`	`2`	`SPA`	`@0 Actividad @5 20`
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C03	`19`	`2`	`SPA`	`@0 Magmatismo @5 21`
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Format Inist (serveur)

NO :	PASCAL 05-0446407 INIST
ET :	Variation in noble gas isotopic composition of gas samples from the Aegean arc, Greece
AU :	SHIMIZU (Aya); SUMINO (Hirochika); NAGAO (Keisuke); NOTSU (Kenji); MITROPOULOS (Panagiotis)
AF :	Laboratory for Earthquake Chemistry Graduate School of Science, University of Tokyo, 7-3-1 Hongo/Bunkyo-ku, Tokyo 113-0033/Japon (1 aut., 2 aut., 3 aut., 4 aut.); Department of Geology, Faculty of Science, National University of Athens, Panepistimiopolis/Ano Ilisia, Athens 15784/Grèce (5 aut.)
DT :	Publication en série; Niveau analytique
SO :	Journal of volcanology and geothermal research; ISSN 0377-0273; Coden JVGRDQ; Pays-Bas; Da. 2005; Vol. 140; No. 4; Pp. 321-339; Bibl. 1 p.3/4
LA :	Anglais
EA :	In contrast to most other arcs with oceanic plate subduction, the Aegean arc is characterized by continent-continent subduction. Noble gas abundances and isotopic compositions of 45 gas samples have been determined from 6 volcanoes along the arc, 2 islands in the back-arc region and 7 sites in the surrounding areas. The ³He/⁴He ratios of the samples ranged from 0.027R_A to 6.2R_A (R_A denotes the atmospheric ³He/⁴He ratio of 1.4 × 10^-6), demonstrating that even the maximum ³He/⁴He ratio in the region is significantly lower than the maximum ratios of most oceanic subduction systems, which are equal to the MORB value of 8±1 R_A. Regional variations in the ³He/⁴He ratio were observed both along and across the arc. The maximum ³He/⁴He ratio was obtained from Nisyros volcano located in the eastern end of the arc, and the ratio decreased westward possibly reflecting the difference in potential degree of crustal assimilation or the present magmatic activity in each volcano. Across the volcanic arc, the ³He/⁴He ratio decreased with an increasing distance from the arc front, reaching a low ratio of 0.063R_A in Macedonia, which suggested a major contribution of radiogenic helium derived from the continental crust. At Nisyros, a temporal increase in ³He/⁴He ratio due to ascending subsurface magma was observed after the seismic crisis of 1995-1998 and mantle neon was possibly detected. The maximum ³He/⁴He ratio (6.2R_A) in the Aegean region, which is significantly lower than the MORB value, is not probably due to crustal assimilation at shallow depth or addition of slab-derived helium to MORB-like mantle wedge, but inherent characteristics of the subcontinental lithospheric mantle (SCLM) beneath the Aegean arc.
CC :	220C01; 222A01; 001E01C01; 001E01F01
FD :	Gaz rare; Macédoine Grèce; Isotope; Iles Egée Grèce; Subduction; Sr 87-Sr 86; Volcan; Variation temporelle; Assimilation; Arc volcanique; Hélium; Croûte continentale; Magma; Manteau sup; Faible profondeur; Fumerolle; Source thermale; Activité; Magmatisme; Manteau sous continental; He 4-He 3; Hellénides; Ne 22-Ne 20; Gaz volcanique; Manteau lithosphérique; Ne 22-Ne 21; Ar 38-Ar 36; Ar 40-Ar 36; Xe 132; Kr 84
FG :	Grèce; Europe Sud; Europe
ED :	noble gases; Greek Macedonia; isotopes; Greek Aegean Islands; subduction; Sr-87/Sr-86; volcanoes; time variations; assimilation; volcanic arcs; helium; continental crust; magmas; upper mantle; shallow depth; fumaroles; hot springs; activity; magmatism; subcontinental mantle; He-4/He-3; Hellenides; Ne-22/Ne-20; Ne-22/Ne-21; Ar-38/Ar-36; Ar-40/Ar-36; Xe-132; Kr-84
EG :	Greece; Southern Europe; Europe
SD :	Gás noble; Macedonia Griega; Isótopo; Islas Egeas Griegas; Subducción; Sr 87-Sr 86; Volcán; Variación temporal; Asimilación; Helio; Corteza continental; Magma; Manto globo sup; Fumarola; Fuente termal; Actividad; Magmatismo; Xe 132
LO :	INIST-17236.354000126559330040
ID :	05-0446407

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Pascal:05-0446407

Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ar-38/Ar-36</term>
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<term>Greek Aegean Islands</term>
<term>Greek Macedonia</term>
<term>He-4/He-3</term>
<term>Hellenides</term>
<term>Kr-84</term>
<term>Ne-22/Ne-20</term>
<term>Ne-22/Ne-21</term>
<term>Sr-87/Sr-86</term>
<term>Xe-132</term>
<term>activity</term>
<term>assimilation</term>
<term>continental crust</term>
<term>fumaroles</term>
<term>helium</term>
<term>hot springs</term>
<term>isotopes</term>
<term>magmas</term>
<term>magmatism</term>
<term>noble gases</term>
<term>shallow depth</term>
<term>subcontinental mantle</term>
<term>subduction</term>
<term>time variations</term>
<term>upper mantle</term>
<term>volcanic arcs</term>
<term>volcanoes</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Gaz rare</term>
<term>Macédoine Grèce</term>
<term>Isotope</term>
<term>Iles Egée Grèce</term>
<term>Subduction</term>
<term>Sr 87-Sr 86</term>
<term>Volcan</term>
<term>Variation temporelle</term>
<term>Assimilation</term>
<term>Arc volcanique</term>
<term>Hélium</term>
<term>Croûte continentale</term>
<term>Magma</term>
<term>Manteau sup</term>
<term>Faible profondeur</term>
<term>Fumerolle</term>
<term>Source thermale</term>
<term>Activité</term>
<term>Magmatisme</term>
<term>Manteau sous continental</term>
<term>He 4-He 3</term>
<term>Hellénides</term>
<term>Ne 22-Ne 20</term>
<term>Gaz volcanique</term>
<term>Manteau lithosphérique</term>
<term>Ne 22-Ne 21</term>
<term>Ar 38-Ar 36</term>
<term>Ar 40-Ar 36</term>
<term>Xe 132</term>
<term>Kr 84</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">In contrast to most other arcs with oceanic plate subduction, the Aegean arc is characterized by continent-continent subduction. Noble gas abundances and isotopic compositions of 45 gas samples have been determined from 6 volcanoes along the arc, 2 islands in the back-arc region and 7 sites in the surrounding areas. The <sup>3</sup>
He/<sup>4</sup>
He ratios of the samples ranged from 0.027R<sub>A</sub>
 to 6.2R<sub>A</sub>
 (R<sub>A</sub>
 denotes the atmospheric <sup>3</sup>
He/<sup>4</sup>
He ratio of 1.4 × 10<sup>-6</sup>
), demonstrating that even the maximum <sup>3</sup>
He/<sup>4</sup>
He ratio in the region is significantly lower than the maximum ratios of most oceanic subduction systems, which are equal to the MORB value of 8±1 R<sub>A</sub>
. Regional variations in the <sup>3</sup>
He/<sup>4</sup>
He ratio were observed both along and across the arc. The maximum <sup>3</sup>
He/<sup>4</sup>
He ratio was obtained from Nisyros volcano located in the eastern end of the arc, and the ratio decreased westward possibly reflecting the difference in potential degree of crustal assimilation or the present magmatic activity in each volcano. Across the volcanic arc, the <sup>3</sup>
He/<sup>4</sup>
He ratio decreased with an increasing distance from the arc front, reaching a low ratio of 0.063R<sub>A</sub>
 in Macedonia, which suggested a major contribution of radiogenic helium derived from the continental crust. At Nisyros, a temporal increase in <sup>3</sup>
He/<sup>4</sup>
He ratio due to ascending subsurface magma was observed after the seismic crisis of 1995-1998 and mantle neon was possibly detected. The maximum <sup>3</sup>
He/<sup>4</sup>
He ratio (6.2R<sub>A</sub>
) in the Aegean region, which is significantly lower than the MORB value, is not probably due to crustal assimilation at shallow depth or addition of slab-derived helium to MORB-like mantle wedge, but inherent characteristics of the subcontinental lithospheric mantle (SCLM) beneath the Aegean arc.</div>
</front>
</TEI>
<inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0377-0273</s0>
</fA01>
<fA02 i1="01"><s0>JVGRDQ</s0>
</fA02>
<fA03 i2="1"><s0>J. volcanol. geotherm. res.</s0>
</fA03>
<fA05><s2>140</s2>
</fA05>
<fA06><s2>4</s2>
</fA06>
<fA08 i1="01" i2="1" l="ENG"><s1>Variation in noble gas isotopic composition of gas samples from the Aegean arc, Greece</s1>
</fA08>
<fA11 i1="01" i2="1"><s1>SHIMIZU (Aya)</s1>
</fA11>
<fA11 i1="02" i2="1"><s1>SUMINO (Hirochika)</s1>
</fA11>
<fA11 i1="03" i2="1"><s1>NAGAO (Keisuke)</s1>
</fA11>
<fA11 i1="04" i2="1"><s1>NOTSU (Kenji)</s1>
</fA11>
<fA11 i1="05" i2="1"><s1>MITROPOULOS (Panagiotis)</s1>
</fA11>
<fA14 i1="01"><s1>Laboratory for Earthquake Chemistry Graduate School of Science, University of Tokyo, 7-3-1 Hongo</s1>
<s2>Bunkyo-ku, Tokyo 113-0033</s2>
<s3>JPN</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
</fA14>
<fA14 i1="02"><s1>Department of Geology, Faculty of Science, National University of Athens, Panepistimiopolis</s1>
<s2>Ano Ilisia, Athens 15784</s2>
<s3>GRC</s3>
<sZ>5 aut.</sZ>
</fA14>
<fA20><s1>321-339</s1>
<s7>3</s7>
</fA20>
<fA21><s1>2005</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
</fA23>
<fA43 i1="01"><s1>INIST</s1>
<s2>17236</s2>
<s5>354000126559330040</s5>
</fA43>
<fA44><s0>0000</s0>
<s1>© 2005 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45><s0>1 p.3/4</s0>
</fA45>
<fA47 i1="01" i2="1"><s0>05-0446407</s0>
</fA47>
<fA60><s1>P</s1>
</fA60>
<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="1"><s0>Journal of volcanology and geothermal research</s0>
</fA64>
<fA66 i1="01"><s0>NLD</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>In contrast to most other arcs with oceanic plate subduction, the Aegean arc is characterized by continent-continent subduction. Noble gas abundances and isotopic compositions of 45 gas samples have been determined from 6 volcanoes along the arc, 2 islands in the back-arc region and 7 sites in the surrounding areas. The <sup>3</sup>
He/<sup>4</sup>
He ratios of the samples ranged from 0.027R<sub>A</sub>
 to 6.2R<sub>A</sub>
 (R<sub>A</sub>
 denotes the atmospheric <sup>3</sup>
He/<sup>4</sup>
He ratio of 1.4 × 10<sup>-6</sup>
), demonstrating that even the maximum <sup>3</sup>
He/<sup>4</sup>
He ratio in the region is significantly lower than the maximum ratios of most oceanic subduction systems, which are equal to the MORB value of 8±1 R<sub>A</sub>
. Regional variations in the <sup>3</sup>
He/<sup>4</sup>
He ratio were observed both along and across the arc. The maximum <sup>3</sup>
He/<sup>4</sup>
He ratio was obtained from Nisyros volcano located in the eastern end of the arc, and the ratio decreased westward possibly reflecting the difference in potential degree of crustal assimilation or the present magmatic activity in each volcano. Across the volcanic arc, the <sup>3</sup>
He/<sup>4</sup>
He ratio decreased with an increasing distance from the arc front, reaching a low ratio of 0.063R<sub>A</sub>
 in Macedonia, which suggested a major contribution of radiogenic helium derived from the continental crust. At Nisyros, a temporal increase in <sup>3</sup>
He/<sup>4</sup>
He ratio due to ascending subsurface magma was observed after the seismic crisis of 1995-1998 and mantle neon was possibly detected. The maximum <sup>3</sup>
He/<sup>4</sup>
He ratio (6.2R<sub>A</sub>
) in the Aegean region, which is significantly lower than the MORB value, is not probably due to crustal assimilation at shallow depth or addition of slab-derived helium to MORB-like mantle wedge, but inherent characteristics of the subcontinental lithospheric mantle (SCLM) beneath the Aegean arc.</s0>
</fC01>
<fC02 i1="01" i2="2"><s0>220C01</s0>
</fC02>
<fC02 i1="02" i2="2"><s0>222A01</s0>
</fC02>
<fC02 i1="03" i2="2"><s0>001E01C01</s0>
</fC02>
<fC02 i1="04" i2="2"><s0>001E01F01</s0>
</fC02>
<fC03 i1="01" i2="2" l="FRE"><s0>Gaz rare</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="2" l="ENG"><s0>noble gases</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="2" l="SPA"><s0>Gás noble</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="2" l="FRE"><s0>Macédoine Grèce</s0>
<s2>NG</s2>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="2" l="ENG"><s0>Greek Macedonia</s0>
<s2>NG</s2>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="2" l="SPA"><s0>Macedonia Griega</s0>
<s2>NG</s2>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="2" l="FRE"><s0>Isotope</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="2" l="ENG"><s0>isotopes</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="2" l="SPA"><s0>Isótopo</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="2" l="FRE"><s0>Iles Egée Grèce</s0>
<s2>NG</s2>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="ENG"><s0>Greek Aegean Islands</s0>
<s2>NG</s2>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="SPA"><s0>Islas Egeas Griegas</s0>
<s2>NG</s2>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="2" l="FRE"><s0>Subduction</s0>
<s5>07</s5>
</fC03>
<fC03 i1="05" i2="2" l="ENG"><s0>subduction</s0>
<s5>07</s5>
</fC03>
<fC03 i1="05" i2="2" l="SPA"><s0>Subducción</s0>
<s5>07</s5>
</fC03>
<fC03 i1="06" i2="2" l="FRE"><s0>Sr 87-Sr 86</s0>
<s5>08</s5>
</fC03>
<fC03 i1="06" i2="2" l="ENG"><s0>Sr-87/Sr-86</s0>
<s5>08</s5>
</fC03>
<fC03 i1="06" i2="2" l="SPA"><s0>Sr 87-Sr 86</s0>
<s5>08</s5>
</fC03>
<fC03 i1="07" i2="2" l="FRE"><s0>Volcan</s0>
<s5>09</s5>
</fC03>
<fC03 i1="07" i2="2" l="ENG"><s0>volcanoes</s0>
<s5>09</s5>
</fC03>
<fC03 i1="07" i2="2" l="SPA"><s0>Volcán</s0>
<s5>09</s5>
</fC03>
<fC03 i1="08" i2="2" l="FRE"><s0>Variation temporelle</s0>
<s5>10</s5>
</fC03>
<fC03 i1="08" i2="2" l="ENG"><s0>time variations</s0>
<s5>10</s5>
</fC03>
<fC03 i1="08" i2="2" l="SPA"><s0>Variación temporal</s0>
<s5>10</s5>
</fC03>
<fC03 i1="09" i2="2" l="FRE"><s0>Assimilation</s0>
<s5>11</s5>
</fC03>
<fC03 i1="09" i2="2" l="ENG"><s0>assimilation</s0>
<s5>11</s5>
</fC03>
<fC03 i1="09" i2="2" l="SPA"><s0>Asimilación</s0>
<s5>11</s5>
</fC03>
<fC03 i1="10" i2="2" l="FRE"><s0>Arc volcanique</s0>
<s5>12</s5>
</fC03>
<fC03 i1="10" i2="2" l="ENG"><s0>volcanic arcs</s0>
<s5>12</s5>
</fC03>
<fC03 i1="11" i2="2" l="FRE"><s0>Hélium</s0>
<s5>13</s5>
</fC03>
<fC03 i1="11" i2="2" l="ENG"><s0>helium</s0>
<s5>13</s5>
</fC03>
<fC03 i1="11" i2="2" l="SPA"><s0>Helio</s0>
<s5>13</s5>
</fC03>
<fC03 i1="12" i2="2" l="FRE"><s0>Croûte continentale</s0>
<s5>14</s5>
</fC03>
<fC03 i1="12" i2="2" l="ENG"><s0>continental crust</s0>
<s5>14</s5>
</fC03>
<fC03 i1="12" i2="2" l="SPA"><s0>Corteza continental</s0>
<s5>14</s5>
</fC03>
<fC03 i1="13" i2="2" l="FRE"><s0>Magma</s0>
<s5>15</s5>
</fC03>
<fC03 i1="13" i2="2" l="ENG"><s0>magmas</s0>
<s5>15</s5>
</fC03>
<fC03 i1="13" i2="2" l="SPA"><s0>Magma</s0>
<s5>15</s5>
</fC03>
<fC03 i1="14" i2="2" l="FRE"><s0>Manteau sup</s0>
<s5>16</s5>
</fC03>
<fC03 i1="14" i2="2" l="ENG"><s0>upper mantle</s0>
<s5>16</s5>
</fC03>
<fC03 i1="14" i2="2" l="SPA"><s0>Manto globo sup</s0>
<s5>16</s5>
</fC03>
<fC03 i1="15" i2="2" l="FRE"><s0>Faible profondeur</s0>
<s5>17</s5>
</fC03>
<fC03 i1="15" i2="2" l="ENG"><s0>shallow depth</s0>
<s5>17</s5>
</fC03>
<fC03 i1="16" i2="2" l="FRE"><s0>Fumerolle</s0>
<s5>18</s5>
</fC03>
<fC03 i1="16" i2="2" l="ENG"><s0>fumaroles</s0>
<s5>18</s5>
</fC03>
<fC03 i1="16" i2="2" l="SPA"><s0>Fumarola</s0>
<s5>18</s5>
</fC03>
<fC03 i1="17" i2="2" l="FRE"><s0>Source thermale</s0>
<s5>19</s5>
</fC03>
<fC03 i1="17" i2="2" l="ENG"><s0>hot springs</s0>
<s5>19</s5>
</fC03>
<fC03 i1="17" i2="2" l="SPA"><s0>Fuente termal</s0>
<s5>19</s5>
</fC03>
<fC03 i1="18" i2="2" l="FRE"><s0>Activité</s0>
<s5>20</s5>
</fC03>
<fC03 i1="18" i2="2" l="ENG"><s0>activity</s0>
<s5>20</s5>
</fC03>
<fC03 i1="18" i2="2" l="SPA"><s0>Actividad</s0>
<s5>20</s5>
</fC03>
<fC03 i1="19" i2="2" l="FRE"><s0>Magmatisme</s0>
<s5>21</s5>
</fC03>
<fC03 i1="19" i2="2" l="ENG"><s0>magmatism</s0>
<s5>21</s5>
</fC03>
<fC03 i1="19" i2="2" l="SPA"><s0>Magmatismo</s0>
<s5>21</s5>
</fC03>
<fC03 i1="20" i2="2" l="FRE"><s0>Manteau sous continental</s0>
<s5>22</s5>
</fC03>
<fC03 i1="20" i2="2" l="ENG"><s0>subcontinental mantle</s0>
<s5>22</s5>
</fC03>
<fC03 i1="21" i2="2" l="FRE"><s0>He 4-He 3</s0>
<s5>23</s5>
</fC03>
<fC03 i1="21" i2="2" l="ENG"><s0>He-4/He-3</s0>
<s5>23</s5>
</fC03>
<fC03 i1="22" i2="2" l="FRE"><s0>Hellénides</s0>
<s2>NG</s2>
<s5>24</s5>
</fC03>
<fC03 i1="22" i2="2" l="ENG"><s0>Hellenides</s0>
<s2>NG</s2>
<s5>24</s5>
</fC03>
<fC03 i1="23" i2="2" l="FRE"><s0>Ne 22-Ne 20</s0>
<s5>25</s5>
</fC03>
<fC03 i1="23" i2="2" l="ENG"><s0>Ne-22/Ne-20</s0>
<s5>25</s5>
</fC03>
<fC03 i1="24" i2="2" l="FRE"><s0>Gaz volcanique</s0>
<s4>INC</s4>
<s5>52</s5>
</fC03>
<fC03 i1="25" i2="2" l="FRE"><s0>Manteau lithosphérique</s0>
<s4>INC</s4>
<s5>53</s5>
</fC03>
<fC03 i1="26" i2="2" l="FRE"><s0>Ne 22-Ne 21</s0>
<s5>61</s5>
</fC03>
<fC03 i1="26" i2="2" l="ENG"><s0>Ne-22/Ne-21</s0>
<s5>61</s5>
</fC03>
<fC03 i1="27" i2="2" l="FRE"><s0>Ar 38-Ar 36</s0>
<s5>62</s5>
</fC03>
<fC03 i1="27" i2="2" l="ENG"><s0>Ar-38/Ar-36</s0>
<s5>62</s5>
</fC03>
<fC03 i1="28" i2="2" l="FRE"><s0>Ar 40-Ar 36</s0>
<s5>63</s5>
</fC03>
<fC03 i1="28" i2="2" l="ENG"><s0>Ar-40/Ar-36</s0>
<s5>63</s5>
</fC03>
<fC03 i1="29" i2="2" l="FRE"><s0>Xe 132</s0>
<s5>64</s5>
</fC03>
<fC03 i1="29" i2="2" l="ENG"><s0>Xe-132</s0>
<s5>64</s5>
</fC03>
<fC03 i1="29" i2="2" l="SPA"><s0>Xe 132</s0>
<s5>64</s5>
</fC03>
<fC03 i1="30" i2="2" l="FRE"><s0>Kr 84</s0>
<s5>65</s5>
</fC03>
<fC03 i1="30" i2="2" l="ENG"><s0>Kr-84</s0>
<s5>65</s5>
</fC03>
<fC06><s0>ILS</s0>
<s0>TAS</s0>
<s0>ANS</s0>
</fC06>
<fC07 i1="01" i2="2" l="FRE"><s0>Grèce</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="2" l="ENG"><s0>Greece</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="2" l="SPA"><s0>Grecia</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="2" l="FRE"><s0>Europe Sud</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="2" l="ENG"><s0>Southern Europe</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="2" l="SPA"><s0>Europa Sur</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="03" i2="2" l="FRE"><s0>Europe</s0>
</fC07>
<fC07 i1="03" i2="2" l="ENG"><s0>Europe</s0>
</fC07>
<fC07 i1="03" i2="2" l="SPA"><s0>Europa</s0>
</fC07>
<fN21><s1>311</s1>
</fN21>
<fN44 i1="01"><s1>PSI</s1>
</fN44>
<fN82><s1>PSI</s1>
</fN82>
</pA>
</standard>
<server><NO>PASCAL 05-0446407 INIST</NO>
<ET>Variation in noble gas isotopic composition of gas samples from the Aegean arc, Greece</ET>
<AU>SHIMIZU (Aya); SUMINO (Hirochika); NAGAO (Keisuke); NOTSU (Kenji); MITROPOULOS (Panagiotis)</AU>
<AF>Laboratory for Earthquake Chemistry Graduate School of Science, University of Tokyo, 7-3-1 Hongo/Bunkyo-ku, Tokyo 113-0033/Japon (1 aut., 2 aut., 3 aut., 4 aut.); Department of Geology, Faculty of Science, National University of Athens, Panepistimiopolis/Ano Ilisia, Athens 15784/Grèce (5 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Journal of volcanology and geothermal research; ISSN 0377-0273; Coden JVGRDQ; Pays-Bas; Da. 2005; Vol. 140; No. 4; Pp. 321-339; Bibl. 1 p.3/4</SO>
<LA>Anglais</LA>
<EA>In contrast to most other arcs with oceanic plate subduction, the Aegean arc is characterized by continent-continent subduction. Noble gas abundances and isotopic compositions of 45 gas samples have been determined from 6 volcanoes along the arc, 2 islands in the back-arc region and 7 sites in the surrounding areas. The <sup>3</sup>
He/<sup>4</sup>
He ratios of the samples ranged from 0.027R<sub>A</sub>
 to 6.2R<sub>A</sub>
 (R<sub>A</sub>
 denotes the atmospheric <sup>3</sup>
He/<sup>4</sup>
He ratio of 1.4 × 10<sup>-6</sup>
), demonstrating that even the maximum <sup>3</sup>
He/<sup>4</sup>
He ratio in the region is significantly lower than the maximum ratios of most oceanic subduction systems, which are equal to the MORB value of 8±1 R<sub>A</sub>
. Regional variations in the <sup>3</sup>
He/<sup>4</sup>
He ratio were observed both along and across the arc. The maximum <sup>3</sup>
He/<sup>4</sup>
He ratio was obtained from Nisyros volcano located in the eastern end of the arc, and the ratio decreased westward possibly reflecting the difference in potential degree of crustal assimilation or the present magmatic activity in each volcano. Across the volcanic arc, the <sup>3</sup>
He/<sup>4</sup>
He ratio decreased with an increasing distance from the arc front, reaching a low ratio of 0.063R<sub>A</sub>
 in Macedonia, which suggested a major contribution of radiogenic helium derived from the continental crust. At Nisyros, a temporal increase in <sup>3</sup>
He/<sup>4</sup>
He ratio due to ascending subsurface magma was observed after the seismic crisis of 1995-1998 and mantle neon was possibly detected. The maximum <sup>3</sup>
He/<sup>4</sup>
He ratio (6.2R<sub>A</sub>
) in the Aegean region, which is significantly lower than the MORB value, is not probably due to crustal assimilation at shallow depth or addition of slab-derived helium to MORB-like mantle wedge, but inherent characteristics of the subcontinental lithospheric mantle (SCLM) beneath the Aegean arc.</EA>
<CC>220C01; 222A01; 001E01C01; 001E01F01</CC>
<FD>Gaz rare; Macédoine Grèce; Isotope; Iles Egée Grèce; Subduction; Sr 87-Sr 86; Volcan; Variation temporelle; Assimilation; Arc volcanique; Hélium; Croûte continentale; Magma; Manteau sup; Faible profondeur; Fumerolle; Source thermale; Activité; Magmatisme; Manteau sous continental; He 4-He 3; Hellénides; Ne 22-Ne 20; Gaz volcanique; Manteau lithosphérique; Ne 22-Ne 21; Ar 38-Ar 36; Ar 40-Ar 36; Xe 132; Kr 84</FD>
<FG>Grèce; Europe Sud; Europe</FG>
<ED>noble gases; Greek Macedonia; isotopes; Greek Aegean Islands; subduction; Sr-87/Sr-86; volcanoes; time variations; assimilation; volcanic arcs; helium; continental crust; magmas; upper mantle; shallow depth; fumaroles; hot springs; activity; magmatism; subcontinental mantle; He-4/He-3; Hellenides; Ne-22/Ne-20; Ne-22/Ne-21; Ar-38/Ar-36; Ar-40/Ar-36; Xe-132; Kr-84</ED>
<EG>Greece; Southern Europe; Europe</EG>
<SD>Gás noble; Macedonia Griega; Isótopo; Islas Egeas Griegas; Subducción; Sr 87-Sr 86; Volcán; Variación temporal; Asimilación; Helio; Corteza continental; Magma; Manto globo sup; Fumarola; Fuente termal; Actividad; Magmatismo; Xe 132</SD>
<LO>INIST-17236.354000126559330040</LO>
<ID>05-0446407</ID>
</server>
</inist>
</record>

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Variation in noble gas isotopic composition of gas samples from the Aegean arc, Greece

Variation in noble gas isotopic composition of gas samples from the Aegean arc, Greece

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