Magma mixing at Nisyros volcano, as inferred from incompatible trace-element systematics
Identifieur interne : 000387 ( Main/Exploration ); précédent : 000386; suivant : 000388Magma mixing at Nisyros volcano, as inferred from incompatible trace-element systematics
Auteurs : Karen St. Seymour [Canada] ; Dimitri Vlassopoulos [États-Unis]Source :
- Journal of Volcanology and Geothermal Research [ 0377-0273 ] ; 1992.
Descripteurs français
English descriptors
- KwdEn :
- Amphibole, Andesite, Andesite inclusion, Andesitic, Andesitic inclusions, Apatite, Basalt, Basaltic, Basaltic andesite, Basaltic andesites, Caldera, Caldera collapse, Clinopyroxene, Companion plots, Compositional, Concordia university, Contrib, Crustal, Crustal assimilation, Crystal fractionation, Dacite, Dacitic, Felsic, Fractional crystallization, Fractionation, Hyperbolic distributions, Inclusion, Incompatible, Labr, Lalonde, Langmuir, Lava, Linear trend, Mafic, Mafic glass, Mafic liquids, Magma, Magmatic, Major elements, Mineral chemistry, Nisyros, Nisyros lavas, Nisyros volcano, Olivine, Opaque oxides, Orthopyroxene, Oxide, Paola, Parentheses population, Parentheses representative analyses, Pearce, Petrogenetic, Petrol, Phenocrysts, Plagioclase, Plagioclase phenocrysts, Postcaldera dacites, Pumice, Pumiceous, Pyroclastic, Rhyodacite, Rhyodacite flows, Rhyodacites, Rhyolite, Seymour, Silicic, Silicic andesites, Sio2, Source region, Subaerial, Subaerial andesites, Systematics, Tio2, Trace elements, Vlassopoulos, Vlassopoulos table, Volcanic, Volcanic rocks, Volcanism, Volcano, Volcanol, Wyers.
- Teeft :
- Amphibole, Andesite, Andesite inclusion, Andesitic, Andesitic inclusions, Apatite, Basalt, Basaltic, Basaltic andesite, Basaltic andesites, Caldera, Caldera collapse, Clinopyroxene, Companion plots, Compositional, Concordia university, Contrib, Crustal, Crustal assimilation, Crystal fractionation, Dacite, Dacitic, Felsic, Fractional crystallization, Fractionation, Hyperbolic distributions, Inclusion, Incompatible, Labr, Lalonde, Langmuir, Lava, Linear trend, Mafic, Mafic glass, Mafic liquids, Magma, Magmatic, Major elements, Mineral chemistry, Nisyros, Nisyros lavas, Nisyros volcano, Olivine, Opaque oxides, Orthopyroxene, Oxide, Paola, Parentheses population, Parentheses representative analyses, Pearce, Petrogenetic, Petrol, Phenocrysts, Plagioclase, Plagioclase phenocrysts, Postcaldera dacites, Pumice, Pumiceous, Pyroclastic, Rhyodacite, Rhyodacite flows, Rhyodacites, Rhyolite, Seymour, Silicic, Silicic andesites, Sio2, Source region, Subaerial, Subaerial andesites, Systematics, Tio2, Trace elements, Vlassopoulos, Vlassopoulos table, Volcanic, Volcanic rocks, Volcanism, Volcano, Volcanol, Wyers.
Abstract
Abstract: Rocks of the calc-alkaline volcanic complex of Nisyros, at the eastern end of the Quaternary South Aegean volcanic arc, range in composition from basaltic andesite to rhyodacite. Major- and compatible trace-element systematics are dominated by crystal fractionation, involving olivine, clinopyroxene, plagioclase, and magnetite in the mafic to intermediate compositional range and plagioclase, clinopyroxene, hypersthene, Fe-Ti oxides, and apatite in the intermediate to silicic range, although there is a marked paucity of lavas with 60–66 wt.% SiO2. The occurrence of andesitic inclusions in pre- and post-caldera dacites as well as reversely zoned and/or partly resorbed phenocrysts, exotic mineralogy (e.g., forsteritic olivine), compositionally bimodal plagioclase phenocryst populations, and the observation of two distinct glass phases in melt inclusions and pumices all indicate that magma mixing processes have played a role in the petrogenesis of Nisyros. Incompatible trace-element systematics are consistent with mixing between mafic and silicic end members. Major-element binary mixing calculations between end members successfully reproduce the dacite composition. The eruptive sequence at Nisyros suggests the existence of a compositionally zoned magma chamber, in which mixing between underlying more mafic magma and overlying rhyodacitic melt result in the formation of dacitic magmas. Inherent mineral assemblages in basaltic andesites indicate that mixing between mafic liquids and between mafic and more silicic liquids played also a role in their petrogenesis.
Url:
DOI: 10.1016/0377-0273(92)90097-W
Affiliations:
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H4B 1R6</wicri:noRegion></affiliation></author><author><name sortKey="Vlassopoulos, Dimitri" sort="Vlassopoulos, Dimitri" uniqKey="Vlassopoulos D" first="Dimitri" last="Vlassopoulos">Dimitri Vlassopoulos</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91106</wicri:regionArea><placeName><region type="state">Californie</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Volcanology and Geothermal Research</title><title level="j" type="abbrev">VOLGEO</title><idno type="ISSN">0377-0273</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1992">1992</date><biblScope unit="volume">50</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="273">273</biblScope><biblScope unit="page" to="299">299</biblScope></imprint><idno 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distributions</term><term>Inclusion</term><term>Incompatible</term><term>Labr</term><term>Lalonde</term><term>Langmuir</term><term>Lava</term><term>Linear trend</term><term>Mafic</term><term>Mafic glass</term><term>Mafic liquids</term><term>Magma</term><term>Magmatic</term><term>Major elements</term><term>Mineral chemistry</term><term>Nisyros</term><term>Nisyros lavas</term><term>Nisyros volcano</term><term>Olivine</term><term>Opaque oxides</term><term>Orthopyroxene</term><term>Oxide</term><term>Paola</term><term>Parentheses population</term><term>Parentheses representative analyses</term><term>Pearce</term><term>Petrogenetic</term><term>Petrol</term><term>Phenocrysts</term><term>Plagioclase</term><term>Plagioclase phenocrysts</term><term>Postcaldera dacites</term><term>Pumice</term><term>Pumiceous</term><term>Pyroclastic</term><term>Rhyodacite</term><term>Rhyodacite flows</term><term>Rhyodacites</term><term>Rhyolite</term><term>Seymour</term><term>Silicic</term><term>Silicic andesites</term><term>Sio2</term><term>Source region</term><term>Subaerial</term><term>Subaerial andesites</term><term>Systematics</term><term>Tio2</term><term>Trace elements</term><term>Vlassopoulos</term><term>Vlassopoulos table</term><term>Volcanic</term><term>Volcanic rocks</term><term>Volcanism</term><term>Volcano</term><term>Volcanol</term><term>Wyers</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Amphibole</term><term>Andesite</term><term>Andesite inclusion</term><term>Andesitic</term><term>Andesitic inclusions</term><term>Apatite</term><term>Basalt</term><term>Basaltic</term><term>Basaltic andesite</term><term>Basaltic andesites</term><term>Caldera</term><term>Caldera collapse</term><term>Clinopyroxene</term><term>Companion plots</term><term>Compositional</term><term>Concordia university</term><term>Contrib</term><term>Crustal</term><term>Crustal assimilation</term><term>Crystal fractionation</term><term>Dacite</term><term>Dacitic</term><term>Felsic</term><term>Fractional crystallization</term><term>Fractionation</term><term>Hyperbolic distributions</term><term>Inclusion</term><term>Incompatible</term><term>Labr</term><term>Lalonde</term><term>Langmuir</term><term>Lava</term><term>Linear trend</term><term>Mafic</term><term>Mafic glass</term><term>Mafic liquids</term><term>Magma</term><term>Magmatic</term><term>Major elements</term><term>Mineral chemistry</term><term>Nisyros</term><term>Nisyros lavas</term><term>Nisyros volcano</term><term>Olivine</term><term>Opaque oxides</term><term>Orthopyroxene</term><term>Oxide</term><term>Paola</term><term>Parentheses population</term><term>Parentheses representative analyses</term><term>Pearce</term><term>Petrogenetic</term><term>Petrol</term><term>Phenocrysts</term><term>Plagioclase</term><term>Plagioclase phenocrysts</term><term>Postcaldera dacites</term><term>Pumice</term><term>Pumiceous</term><term>Pyroclastic</term><term>Rhyodacite</term><term>Rhyodacite flows</term><term>Rhyodacites</term><term>Rhyolite</term><term>Seymour</term><term>Silicic</term><term>Silicic andesites</term><term>Sio2</term><term>Source region</term><term>Subaerial</term><term>Subaerial andesites</term><term>Systematics</term><term>Tio2</term><term>Trace elements</term><term>Vlassopoulos</term><term>Vlassopoulos table</term><term>Volcanic</term><term>Volcanic rocks</term><term>Volcanism</term><term>Volcano</term><term>Volcanol</term><term>Wyers</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Oxyde</term><term>Essence</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: Rocks of the calc-alkaline volcanic complex of Nisyros, at the eastern end of the Quaternary South Aegean volcanic arc, range in composition from basaltic andesite to rhyodacite. Major- and compatible trace-element systematics are dominated by crystal fractionation, involving olivine, clinopyroxene, plagioclase, and magnetite in the mafic to intermediate compositional range and plagioclase, clinopyroxene, hypersthene, Fe-Ti oxides, and apatite in the intermediate to silicic range, although there is a marked paucity of lavas with 60–66 wt.% SiO2. The occurrence of andesitic inclusions in pre- and post-caldera dacites as well as reversely zoned and/or partly resorbed phenocrysts, exotic mineralogy (e.g., forsteritic olivine), compositionally bimodal plagioclase phenocryst populations, and the observation of two distinct glass phases in melt inclusions and pumices all indicate that magma mixing processes have played a role in the petrogenesis of Nisyros. Incompatible trace-element systematics are consistent with mixing between mafic and silicic end members. Major-element binary mixing calculations between end members successfully reproduce the dacite composition. The eruptive sequence at Nisyros suggests the existence of a compositionally zoned magma chamber, in which mixing between underlying more mafic magma and overlying rhyodacitic melt result in the formation of dacitic magmas. Inherent mineral assemblages in basaltic andesites indicate that mixing between mafic liquids and between mafic and more silicic liquids played also a role in their petrogenesis.</div></front></TEI><affiliations><list><country><li>Canada</li><li>États-Unis</li></country><region><li>Californie</li></region></list><tree><country name="Canada"><noRegion><name sortKey="St Seymour, Karen" sort="St Seymour, Karen" uniqKey="St Seymour K" first="Karen" last="St. Seymour">Karen St. Seymour</name></noRegion></country><country name="États-Unis"><region name="Californie"><name sortKey="Vlassopoulos, Dimitri" sort="Vlassopoulos, Dimitri" uniqKey="Vlassopoulos D" first="Dimitri" last="Vlassopoulos">Dimitri Vlassopoulos</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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