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Significance of mineral composition variations in the Aegean Island Arc

Identifieur interne : 000385 ( Main/Exploration ); précédent : 000384; suivant : 000386

Significance of mineral composition variations in the Aegean Island Arc

Auteurs : Panagiotis Mitropoulos [Grèce] ; John Tarney [Royaume-Uni]

Source :

Journal of Volcanology and Geothermal Research [ 0377-0273 ] ; 1992.

RBID : ISTEX:4CABB9D13ACE085B1DB3F912C40A2A2FFC7338C5

Descripteurs français

Wicri :
- topic : Essence.

English descriptors

KwdEn :
- Aegean, Aegean island, Aegean region, Aegina, Amphibole, Andesite, Asthenosphere, Central part, Central sector, Centre, Clinopyroxenes, Compositional, Contrib, Crustal, Dacite, Earth planet, Edenite, Edenite substitution, Fluid phase, Fugacity, Fytikas, Geochemical, Geol, Greater degree, Greater depths, Hellenic trench, Hornblende, Huijsmans, Hydrous, Lava, Lava compositions, Lavas sio2 tio2, Lithosphere, Lithosphere extension, Magma, Mantle wedge, Methana, Milo, Mineral composition variations, Mitropoulos, Neues jahrb, Nicholls, Nisyros, Olivine, Orogenic andesites, Other centres, Oxidation state, Oxygen fugacity, Parental magmas, Petrol, Phenocrysts, Plagioclase, Poros, Redox, Redox state, Representative analyses, Santorini, Santorini dacites, Santorini lavas, Santorini volcano, Saunders, Sio2, Sio2 tio2, Subduction, Subduction zones, Substitution, Tarney, Tio2, Titanomagnetites, Volcanic, Volcanic centres, Volcanic rocks, Volcanism, Volcano, Volcanol, Western sectors.
Teeft :
- Aegean, Aegean island, Aegean region, Aegina, Amphibole, Andesite, Asthenosphere, Central part, Central sector, Centre, Clinopyroxenes, Compositional, Contrib, Crustal, Dacite, Earth planet, Edenite, Edenite substitution, Fluid phase, Fugacity, Fytikas, Geochemical, Geol, Greater degree, Greater depths, Hellenic trench, Hornblende, Huijsmans, Hydrous, Lava, Lava compositions, Lavas sio2 tio2, Lithosphere, Lithosphere extension, Magma, Mantle wedge, Methana, Milo, Mineral composition variations, Mitropoulos, Neues jahrb, Nicholls, Nisyros, Olivine, Orogenic andesites, Other centres, Oxidation state, Oxygen fugacity, Parental magmas, Petrol, Phenocrysts, Plagioclase, Poros, Redox, Redox state, Representative analyses, Santorini, Santorini dacites, Santorini lavas, Santorini volcano, Saunders, Sio2, Sio2 tio2, Subduction, Subduction zones, Substitution, Tarney, Tio2, Titanomagnetites, Volcanic, Volcanic centres, Volcanic rocks, Volcanism, Volcano, Volcanol, Western sectors.

Abstract

Abstract: Phenocryst mineral compositions in lavas from the different volcanics centres in the Aegean Island Arc are compared. The Aegean Arc is based on continental crust and is related to subduction at the Hellenic Trench, but is in a region of major lithosphere extension so that the crust is thinner along the central part of the arc than in the eastern sector, bordering Turkey, or in the western sector, by mainland Greece. There are differences in pyroxene, plagioclase and Fe-Ti oxide compositions between the centre and flanks of the arc. Minerals from the central volcano (Santorini) tend to be less magnesian and/or calcic, and the titanomagnetites more Ti-rich; however, hornblende is uncommon. These differences apply even in lavas of equivalent major-element composition. The mineral data indicate that magma temperatures were lower, oxygen fugacity lower and water contents lower in Santorini, yet surprisingly it was Santorini that suffered paroxysmal eruption.In combination with the differences in whole-rock geochemistry between the central and flanking sectors of the arc, it is suggested that whereas the magma source for much of the arc was rather refractory hornblende-bearing lithosphere, that for Santorini involved more fertile asthenosphere, uprising beneath the central part of the Aegean Arc as a consequence of the greater degree of lithosphere extension in the central part of the arc.

Url:

https://api.istex.fr/document/4CABB9D13ACE085B1DB3F912C40A2A2FFC7338C5/fulltext/pdf

DOI: 10.1016/0377-0273(92)90104-L

Affiliations:

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Le document en format XML

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<term>Greater depths</term>
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<term>Hydrous</term>
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<term>Mantle wedge</term>
<term>Methana</term>
<term>Milo</term>
<term>Mineral composition variations</term>
<term>Mitropoulos</term>
<term>Neues jahrb</term>
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<front><div type="abstract" xml:lang="en">Abstract: Phenocryst mineral compositions in lavas from the different volcanics centres in the Aegean Island Arc are compared. The Aegean Arc is based on continental crust and is related to subduction at the Hellenic Trench, but is in a region of major lithosphere extension so that the crust is thinner along the central part of the arc than in the eastern sector, bordering Turkey, or in the western sector, by mainland Greece. There are differences in pyroxene, plagioclase and Fe-Ti oxide compositions between the centre and flanks of the arc. Minerals from the central volcano (Santorini) tend to be less magnesian and/or calcic, and the titanomagnetites more Ti-rich; however, hornblende is uncommon. These differences apply even in lavas of equivalent major-element composition. The mineral data indicate that magma temperatures were lower, oxygen fugacity lower and water contents lower in Santorini, yet surprisingly it was Santorini that suffered paroxysmal eruption.In combination with the differences in whole-rock geochemistry between the central and flanking sectors of the arc, it is suggested that whereas the magma source for much of the arc was rather refractory hornblende-bearing lithosphere, that for Santorini involved more fertile asthenosphere, uprising beneath the central part of the Aegean Arc as a consequence of the greater degree of lithosphere extension in the central part of the arc.</div>
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Significance of mineral composition variations in the Aegean Island Arc

Significance of mineral composition variations in the Aegean Island Arc

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri