Monitoring oxygen fugacity conditions in pre-, syn- and postcaldera magma chamber of Nisyros volcano, Aegean island arc, Greece
Identifieur interne : 000402 ( Main/Exploration ); précédent : 000401; suivant : 000403Monitoring oxygen fugacity conditions in pre-, syn- and postcaldera magma chamber of Nisyros volcano, Aegean island arc, Greece
Auteurs : Karen St. Seymour [Canada] ; Andrée. Lalonde [Canada]Source :
- Journal of Volcanology and Geothermal Research [ 0377-0273 ] ; 1991.
Descripteurs français
- Wicri :
- topic : Oxyde.
English descriptors
- KwdEn :
- Aegean island, Agio, Agios ioannis rhyodacite flows, Atmospheric oxygen, Caldera, Caldera collapse, Carmichael, Catastrophic event, Concordia university, Crater lake, Crystallization temperatures, Exsolution, Felsic, Ferromagnesian silicates, Feti oxides, Fugacity, Magma, Magma chamber, Magma redox conditions, Magmatic system, Massive exsolution, Monitoring oxygen fugacity conditions, Nisyros, Nisyros stratovolcano, Nisyros volcano, Older event, Opaque oxides, Oxide, Oxide phenocrysts, Oxygen fugacities, Oxygen fugacity, Oxygen fugacity values, Phenocryst assemblage, Plane light, Postcaldera, Postcaldera dacitic domes, Postcaldera domes, Postcaldera magma chamber, Postcaldera units, Precaldera, Pumice, Rhyodacite, Rhyodacitic, Seymour, Significant change, Silicate, Similar composition, Subvolcanic magma chambers, Syncaldera felsic pumice, Volcanic, Volcanic products, Volcanic rocks, Volcano, Water exsolution, Xilm, Xusp, Xusp xilm.
- Teeft :
- Aegean island, Agio, Agios ioannis rhyodacite flows, Atmospheric oxygen, Caldera, Caldera collapse, Carmichael, Catastrophic event, Concordia university, Crater lake, Crystallization temperatures, Exsolution, Felsic, Ferromagnesian silicates, Feti oxides, Fugacity, Magma, Magma chamber, Magma redox conditions, Magmatic system, Massive exsolution, Monitoring oxygen fugacity conditions, Nisyros, Nisyros stratovolcano, Nisyros volcano, Older event, Opaque oxides, Oxide, Oxide phenocrysts, Oxygen fugacities, Oxygen fugacity, Oxygen fugacity values, Phenocryst assemblage, Plane light, Postcaldera, Postcaldera dacitic domes, Postcaldera domes, Postcaldera magma chamber, Postcaldera units, Precaldera, Pumice, Rhyodacite, Rhyodacitic, Seymour, Significant change, Silicate, Similar composition, Subvolcanic magma chambers, Syncaldera felsic pumice, Volcanic, Volcanic products, Volcanic rocks, Volcano, Water exsolution, Xilm, Xusp, Xusp xilm.
Abstract
Abstract: The magmatic oxygen fugacities of the pre-, syn-, and postcaldera products of the Quaternary volcano of Nisyros in the Aegean Volcanic Arc, eastern Mediterranean Sea, have been measured from analyzed compositions of titaniferous magnetite-ilmenite equilibrium pairs. Quench temperatures in the precaldera rhyodacitic flows range from 877 to 836°C and oxygen fugacities from −11.4 to −11.8 log units. One sample of the climactic pumice displays average quench temperatures of 853°C with fO2 of −11.7 log units. Crystallization temperatures of the dacitic domes that intercept the Nisyros caldera range from 843 to 804°C while oxygen fugacities range from −11.4 to −12.1 log units. The rocks of the Nisyros volcano record no significant change in oxygen fugacity relative to buffer curves immediately prior, during and after the caldera-forming event. This is surprising given the considerable potential for interaction between the magmas and atmospheric oxygen during caldera collapse and the concomitant massive exsolution of volatiles. However, the Nisyros fugacity data may not be atypical of stratovolcanoes with products of similar composition and histories of caldera-forming events. We speculate that only in the volcanoes where caldera collapse coincides with magma-meteoric water interaction do the climactic or early postcaldera units show anomalously high oxygen fugacities.
Url:
DOI: 10.1016/0377-0273(91)90085-E
Affiliations:
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K1N 6N5</wicri:noRegion></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="1991">1991</date><biblScope unit="volume">46</biblScope><biblScope unit="issue">3–4</biblScope><biblScope unit="page" from="231">231</biblScope><biblScope unit="page" to="240">240</biblScope></imprint><idno type="ISSN">0377-0273</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0377-0273</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aegean island</term><term>Agio</term><term>Agios ioannis rhyodacite flows</term><term>Atmospheric oxygen</term><term>Caldera</term><term>Caldera collapse</term><term>Carmichael</term><term>Catastrophic event</term><term>Concordia university</term><term>Crater lake</term><term>Crystallization temperatures</term><term>Exsolution</term><term>Felsic</term><term>Ferromagnesian silicates</term><term>Feti oxides</term><term>Fugacity</term><term>Magma</term><term>Magma chamber</term><term>Magma redox conditions</term><term>Magmatic system</term><term>Massive exsolution</term><term>Monitoring oxygen fugacity conditions</term><term>Nisyros</term><term>Nisyros stratovolcano</term><term>Nisyros volcano</term><term>Older event</term><term>Opaque oxides</term><term>Oxide</term><term>Oxide phenocrysts</term><term>Oxygen fugacities</term><term>Oxygen fugacity</term><term>Oxygen fugacity values</term><term>Phenocryst assemblage</term><term>Plane light</term><term>Postcaldera</term><term>Postcaldera dacitic domes</term><term>Postcaldera domes</term><term>Postcaldera magma chamber</term><term>Postcaldera units</term><term>Precaldera</term><term>Pumice</term><term>Rhyodacite</term><term>Rhyodacitic</term><term>Seymour</term><term>Significant change</term><term>Silicate</term><term>Similar composition</term><term>Subvolcanic magma chambers</term><term>Syncaldera felsic pumice</term><term>Volcanic</term><term>Volcanic products</term><term>Volcanic rocks</term><term>Volcano</term><term>Water exsolution</term><term>Xilm</term><term>Xusp</term><term>Xusp xilm</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Aegean island</term><term>Agio</term><term>Agios ioannis rhyodacite flows</term><term>Atmospheric oxygen</term><term>Caldera</term><term>Caldera collapse</term><term>Carmichael</term><term>Catastrophic event</term><term>Concordia university</term><term>Crater lake</term><term>Crystallization temperatures</term><term>Exsolution</term><term>Felsic</term><term>Ferromagnesian silicates</term><term>Feti oxides</term><term>Fugacity</term><term>Magma</term><term>Magma chamber</term><term>Magma redox conditions</term><term>Magmatic system</term><term>Massive exsolution</term><term>Monitoring oxygen fugacity conditions</term><term>Nisyros</term><term>Nisyros stratovolcano</term><term>Nisyros volcano</term><term>Older event</term><term>Opaque oxides</term><term>Oxide</term><term>Oxide phenocrysts</term><term>Oxygen fugacities</term><term>Oxygen fugacity</term><term>Oxygen fugacity values</term><term>Phenocryst assemblage</term><term>Plane light</term><term>Postcaldera</term><term>Postcaldera dacitic domes</term><term>Postcaldera domes</term><term>Postcaldera magma chamber</term><term>Postcaldera units</term><term>Precaldera</term><term>Pumice</term><term>Rhyodacite</term><term>Rhyodacitic</term><term>Seymour</term><term>Significant change</term><term>Silicate</term><term>Similar composition</term><term>Subvolcanic magma chambers</term><term>Syncaldera felsic pumice</term><term>Volcanic</term><term>Volcanic products</term><term>Volcanic rocks</term><term>Volcano</term><term>Water exsolution</term><term>Xilm</term><term>Xusp</term><term>Xusp xilm</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Oxyde</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: The magmatic oxygen fugacities of the pre-, syn-, and postcaldera products of the Quaternary volcano of Nisyros in the Aegean Volcanic Arc, eastern Mediterranean Sea, have been measured from analyzed compositions of titaniferous magnetite-ilmenite equilibrium pairs. Quench temperatures in the precaldera rhyodacitic flows range from 877 to 836°C and oxygen fugacities from −11.4 to −11.8 log units. One sample of the climactic pumice displays average quench temperatures of 853°C with fO2 of −11.7 log units. Crystallization temperatures of the dacitic domes that intercept the Nisyros caldera range from 843 to 804°C while oxygen fugacities range from −11.4 to −12.1 log units. The rocks of the Nisyros volcano record no significant change in oxygen fugacity relative to buffer curves immediately prior, during and after the caldera-forming event. This is surprising given the considerable potential for interaction between the magmas and atmospheric oxygen during caldera collapse and the concomitant massive exsolution of volatiles. However, the Nisyros fugacity data may not be atypical of stratovolcanoes with products of similar composition and histories of caldera-forming events. We speculate that only in the volcanoes where caldera collapse coincides with magma-meteoric water interaction do the climactic or early postcaldera units show anomalously high oxygen fugacities.</div></front></TEI><affiliations><list><country><li>Canada</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Seymour, Karen St" sort="Seymour, Karen St" uniqKey="Seymour K" first="Karen St." last="Seymour">Karen St. Seymour</name></noRegion><name sortKey="Lalonde, Andree" sort="Lalonde, Andree" uniqKey="Lalonde A" first="Andrée." last="Lalonde">Andrée. Lalonde</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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