NissirosV1, PascalFrancis, Corpus, bibRecord, 000005

Inverse differentiation pathway by multiple mafic magma refilling in the last magmatic activity of Nisyros Volcano, Greece

Identifieur interne : 000005 ( PascalFrancis/Corpus ); précédent : 000004; suivant : 000006

Inverse differentiation pathway by multiple mafic magma refilling in the last magmatic activity of Nisyros Volcano, Greece

Auteurs : Eleonora Braschi ; Lorella Francalanci ; Georges E. Vougioukalakis

Source :

Bulletin of volcanology : (Print) [ 0258-8900 ] ; 2012.

RBID : Pascal:12-0287116

Descripteurs français

Pascal (Inist)
- Différenciation, Magma, Volcan, Matière fondue, Eruption type plinien, Caldeira, Ponce, Extrusion, Dôme, Andésite basaltique, Lave, Silice, Mixage, Réservoir, Recyclage, Cumulat, Plagioclase, Cristal, Cristallisation fractionnée, Viscosité, Réduction, Grèce.

English descriptors

KwdEn :
- Greece, basaltic andesite, calderas, crystals, cumulates, differentiation, domes, extrusions, fractional crystallization, lava, magmas, melts, mixing, plagioclase, plinian-type eruptions, pumice, recycling, reduction, reservoirs, silica, viscosity, volcanoes.

Abstract

Based on detailed field, petrographic, chemical, and isotopic data, this paper shows that the youngest magmas of the active Nisyros volcano (South Aegean Arc, Greece) are an example of transition from rhyolitic to less evolved magmas by multiple refilling with mafic melts, triggering complex magma interaction processes. The final magmatic activity of Nisyros was characterized by sub-Plinian caldera-forming eruption (40 ka), emplacing the Upper Pumice (UP) rhyolitic deposits, followed by the extrusion of rhyodacitic post-caldera domes (about 31- 10 ka). The latter are rich in magmatic enclaves with textural and compositional (basaltic-andesite to andesite) characteristics that reveal they are quenched portions of mafic magmas included in a cooler more evolved melt. Dome-lavas have different chemical, isotopic, and mineralogical characteristics from the enclaves. The latter have lower ⁸⁷Sr/⁸⁶Sr and higher ¹⁴³ Nd^{/ 1}44 Nd values than dome-lavas. Silica contents and ⁸⁷Sr/⁸⁶Sr values decrease with time among dome-lavas and enclaves. Micro-scale mingling processes caused by enclave crumbling and by widespread mineral exchanges increase from the oldest to the youngest domes, together with enclave content. We demonstrate that the dome-lavas are multi-component magmas formed by progressive mingling/mixing processes between a rhyolitic component (post-UP) and the enclave-forming mafic magmas refilling the felsic reservoir (from 15 wt.% to 40 wt.% of mafic component with time). We recognize that only the more evolved enclave magmas contribute to this process, in which recycling of cumulate plagioclase crystals is also involved. The post-UP end-member derives by fractional crystallization from the magmas leftover after the previous UP eruptions. The enclave magma differentiation develops mainly by fractional crystallization associated with multiple mixing with mafic melts changing their composition with time. A time-related picture of the relationships between dome-lavas and relative enclaves is proposed, suggesting a delay between a mafic magma input and the relative dome outpouring. We also infer that the magma viscosity reduction by re-heating allows dome extrusion without explosive activity.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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Format Inist (serveur)

NO :	PASCAL 12-0287116 INIST
ET :	Inverse differentiation pathway by multiple mafic magma refilling in the last magmatic activity of Nisyros Volcano, Greece
AU :	BRASCHI (Eleonora); FRANCALANCI (Lorella); VOUGIOUKALAKIS (Georges E.)
AF :	Dipartimento di Scienze della Terra, Università degli Studi di Firenze, via G. La Pira 4/50121 Firenze/Italie (1 aut., 2 aut.); C.N.R., Istituto di Geoscience e Georisorse, sezione di Firenze/Firenze/Italie (2 aut.); IGME, 3rd Entrance Olympic village/Aharne, 13637 Athens/Grèce (3 aut.)
DT :	Publication en série; Niveau analytique
SO :	Bulletin of volcanology : (Print); ISSN 0258-8900; Coden BUVOEW; Allemagne; Da. 2012; Vol. 74; No. 5; Pp. 1083-1100; Bibl. 1 p.1/4
LA :	Anglais
EA :	Based on detailed field, petrographic, chemical, and isotopic data, this paper shows that the youngest magmas of the active Nisyros volcano (South Aegean Arc, Greece) are an example of transition from rhyolitic to less evolved magmas by multiple refilling with mafic melts, triggering complex magma interaction processes. The final magmatic activity of Nisyros was characterized by sub-Plinian caldera-forming eruption (40 ka), emplacing the Upper Pumice (UP) rhyolitic deposits, followed by the extrusion of rhyodacitic post-caldera domes (about 31- 10 ka). The latter are rich in magmatic enclaves with textural and compositional (basaltic-andesite to andesite) characteristics that reveal they are quenched portions of mafic magmas included in a cooler more evolved melt. Dome-lavas have different chemical, isotopic, and mineralogical characteristics from the enclaves. The latter have lower ⁸⁷Sr/⁸⁶Sr and higher ¹⁴³ Nd^{/ 1}44 Nd values than dome-lavas. Silica contents and ⁸⁷Sr/⁸⁶Sr values decrease with time among dome-lavas and enclaves. Micro-scale mingling processes caused by enclave crumbling and by widespread mineral exchanges increase from the oldest to the youngest domes, together with enclave content. We demonstrate that the dome-lavas are multi-component magmas formed by progressive mingling/mixing processes between a rhyolitic component (post-UP) and the enclave-forming mafic magmas refilling the felsic reservoir (from 15 wt.% to 40 wt.% of mafic component with time). We recognize that only the more evolved enclave magmas contribute to this process, in which recycling of cumulate plagioclase crystals is also involved. The post-UP end-member derives by fractional crystallization from the magmas leftover after the previous UP eruptions. The enclave magma differentiation develops mainly by fractional crystallization associated with multiple mixing with mafic melts changing their composition with time. A time-related picture of the relationships between dome-lavas and relative enclaves is proposed, suggesting a delay between a mafic magma input and the relative dome outpouring. We also infer that the magma viscosity reduction by re-heating allows dome extrusion without explosive activity.
CC :	001E01F01; 001E01O02; 222A01; 226B02
FD :	Différenciation; Magma; Volcan; Matière fondue; Eruption type plinien; Caldeira; Ponce; Extrusion; Dôme; Andésite basaltique; Lave; Silice; Mixage; Réservoir; Recyclage; Cumulat; Plagioclase; Cristal; Cristallisation fractionnée; Viscosité; Réduction; Grèce
FG :	Pyroclastite; Roche volcanique; Roche ignée; Andésite; Feldspath; Tectosilicate; Silicate; Europe Sud; Europe
ED :	differentiation; magmas; volcanoes; melts; plinian-type eruptions; calderas; pumice; extrusions; domes; basaltic andesite; lava; silica; mixing; reservoirs; recycling; cumulates; plagioclase; crystals; fractional crystallization; viscosity; reduction; Greece
EG :	pyroclastics; volcanic rocks; igneous rocks; andesites; feldspar; framework silicates; silicates; Southern Europe; Europe
SD :	Magma; Volcán; Producto fundido; Caldera; Piedra pómez; Domo; Lava; Sílice; Mezcla; Reconversión; Cumulofídica; Plagioclasa; Cristal; Cristalización fraccionada; Viscosidad; Grecia
LO :	INIST-2715.354000505268140080
ID :	12-0287116

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Pascal:12-0287116

Le document en format XML

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<front><div type="abstract" xml:lang="en">Based on detailed field, petrographic, chemical, and isotopic data, this paper shows that the youngest magmas of the active Nisyros volcano (South Aegean Arc, Greece) are an example of transition from rhyolitic to less evolved magmas by multiple refilling with mafic melts, triggering complex magma interaction processes. The final magmatic activity of Nisyros was characterized by sub-Plinian caldera-forming eruption (40 ka), emplacing the Upper Pumice (UP) rhyolitic deposits, followed by the extrusion of rhyodacitic post-caldera domes (about 31- 10 ka). The latter are rich in magmatic enclaves with textural and compositional (basaltic-andesite to andesite) characteristics that reveal they are quenched portions of mafic magmas included in a cooler more evolved melt. Dome-lavas have different chemical, isotopic, and mineralogical characteristics from the enclaves. The latter have lower <sup>87</sup>
Sr/<sup>86</sup>
Sr and higher <sup>143</sup>
 Nd<sup>/ 1</sup>
44 Nd values than dome-lavas. Silica contents and <sup>87</sup>
Sr/<sup>86</sup>
Sr values decrease with time among dome-lavas and enclaves. Micro-scale mingling processes caused by enclave crumbling and by widespread mineral exchanges increase from the oldest to the youngest domes, together with enclave content. We demonstrate that the dome-lavas are multi-component magmas formed by progressive mingling/mixing processes between a rhyolitic component (post-UP) and the enclave-forming mafic magmas refilling the felsic reservoir (from 15 wt.% to 40 wt.% of mafic component with time). We recognize that only the more evolved enclave magmas contribute to this process, in which recycling of cumulate plagioclase crystals is also involved. The post-UP end-member derives by fractional crystallization from the magmas leftover after the previous UP eruptions. The enclave magma differentiation develops mainly by fractional crystallization associated with multiple mixing with mafic melts changing their composition with time. A time-related picture of the relationships between dome-lavas and relative enclaves is proposed, suggesting a delay between a mafic magma input and the relative dome outpouring. We also infer that the magma viscosity reduction by re-heating allows dome extrusion without explosive activity.</div>
</front>
</TEI>
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<fA03 i2="1"><s0>Bull. volcanol. : (Print)</s0>
</fA03>
<fA05><s2>74</s2>
</fA05>
<fA06><s2>5</s2>
</fA06>
<fA08 i1="01" i2="1" l="ENG"><s1>Inverse differentiation pathway by multiple mafic magma refilling in the last magmatic activity of Nisyros Volcano, Greece</s1>
</fA08>
<fA11 i1="01" i2="1"><s1>BRASCHI (Eleonora)</s1>
</fA11>
<fA11 i1="02" i2="1"><s1>FRANCALANCI (Lorella)</s1>
</fA11>
<fA11 i1="03" i2="1"><s1>VOUGIOUKALAKIS (Georges E.)</s1>
</fA11>
<fA14 i1="01"><s1>Dipartimento di Scienze della Terra, Università degli Studi di Firenze, via G. La Pira 4</s1>
<s2>50121 Firenze</s2>
<s3>ITA</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
</fA14>
<fA14 i1="02"><s1>C.N.R., Istituto di Geoscience e Georisorse, sezione di Firenze</s1>
<s2>Firenze</s2>
<s3>ITA</s3>
<sZ>2 aut.</sZ>
</fA14>
<fA14 i1="03"><s1>IGME, 3rd Entrance Olympic village</s1>
<s2>Aharne, 13637 Athens</s2>
<s3>GRC</s3>
<sZ>3 aut.</sZ>
</fA14>
<fA20><s1>1083-1100</s1>
</fA20>
<fA21><s1>2012</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
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<fA47 i1="01" i2="1"><s0>12-0287116</s0>
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<fA61><s0>A</s0>
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<fA64 i1="01" i2="1"><s0>Bulletin of volcanology : (Print)</s0>
</fA64>
<fA66 i1="01"><s0>DEU</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>Based on detailed field, petrographic, chemical, and isotopic data, this paper shows that the youngest magmas of the active Nisyros volcano (South Aegean Arc, Greece) are an example of transition from rhyolitic to less evolved magmas by multiple refilling with mafic melts, triggering complex magma interaction processes. The final magmatic activity of Nisyros was characterized by sub-Plinian caldera-forming eruption (40 ka), emplacing the Upper Pumice (UP) rhyolitic deposits, followed by the extrusion of rhyodacitic post-caldera domes (about 31- 10 ka). The latter are rich in magmatic enclaves with textural and compositional (basaltic-andesite to andesite) characteristics that reveal they are quenched portions of mafic magmas included in a cooler more evolved melt. Dome-lavas have different chemical, isotopic, and mineralogical characteristics from the enclaves. The latter have lower <sup>87</sup>
Sr/<sup>86</sup>
Sr and higher <sup>143</sup>
 Nd<sup>/ 1</sup>
44 Nd values than dome-lavas. Silica contents and <sup>87</sup>
Sr/<sup>86</sup>
Sr values decrease with time among dome-lavas and enclaves. Micro-scale mingling processes caused by enclave crumbling and by widespread mineral exchanges increase from the oldest to the youngest domes, together with enclave content. We demonstrate that the dome-lavas are multi-component magmas formed by progressive mingling/mixing processes between a rhyolitic component (post-UP) and the enclave-forming mafic magmas refilling the felsic reservoir (from 15 wt.% to 40 wt.% of mafic component with time). We recognize that only the more evolved enclave magmas contribute to this process, in which recycling of cumulate plagioclase crystals is also involved. The post-UP end-member derives by fractional crystallization from the magmas leftover after the previous UP eruptions. The enclave magma differentiation develops mainly by fractional crystallization associated with multiple mixing with mafic melts changing their composition with time. A time-related picture of the relationships between dome-lavas and relative enclaves is proposed, suggesting a delay between a mafic magma input and the relative dome outpouring. We also infer that the magma viscosity reduction by re-heating allows dome extrusion without explosive activity.</s0>
</fC01>
<fC02 i1="01" i2="2"><s0>001E01F01</s0>
</fC02>
<fC02 i1="02" i2="2"><s0>001E01O02</s0>
</fC02>
<fC02 i1="03" i2="2"><s0>222A01</s0>
</fC02>
<fC02 i1="04" i2="2"><s0>226B02</s0>
</fC02>
<fC03 i1="01" i2="2" l="FRE"><s0>Différenciation</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="2" l="ENG"><s0>differentiation</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="2" l="FRE"><s0>Magma</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="2" l="ENG"><s0>magmas</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="2" l="SPA"><s0>Magma</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="2" l="FRE"><s0>Volcan</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="2" l="ENG"><s0>volcanoes</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="2" l="SPA"><s0>Volcán</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="2" l="FRE"><s0>Matière fondue</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="ENG"><s0>melts</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="SPA"><s0>Producto fundido</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="2" l="FRE"><s0>Eruption type plinien</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="2" l="ENG"><s0>plinian-type eruptions</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="2" l="FRE"><s0>Caldeira</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="2" l="ENG"><s0>calderas</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="2" l="SPA"><s0>Caldera</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="2" l="FRE"><s0>Ponce</s0>
<s2>NV</s2>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="2" l="ENG"><s0>pumice</s0>
<s2>NV</s2>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="2" l="SPA"><s0>Piedra pómez</s0>
<s2>NV</s2>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="2" l="FRE"><s0>Extrusion</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="2" l="ENG"><s0>extrusions</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="2" l="FRE"><s0>Dôme</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="2" l="ENG"><s0>domes</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="2" l="SPA"><s0>Domo</s0>
<s5>09</s5>
</fC03>
<fC03 i1="10" i2="2" l="FRE"><s0>Andésite basaltique</s0>
<s2>NV</s2>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="2" l="ENG"><s0>basaltic andesite</s0>
<s2>NV</s2>
<s5>10</s5>
</fC03>
<fC03 i1="11" i2="2" l="FRE"><s0>Lave</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="2" l="ENG"><s0>lava</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="2" l="SPA"><s0>Lava</s0>
<s5>11</s5>
</fC03>
<fC03 i1="12" i2="2" l="FRE"><s0>Silice</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="2" l="ENG"><s0>silica</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="2" l="SPA"><s0>Sílice</s0>
<s5>12</s5>
</fC03>
<fC03 i1="13" i2="2" l="FRE"><s0>Mixage</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="2" l="ENG"><s0>mixing</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="2" l="SPA"><s0>Mezcla</s0>
<s5>13</s5>
</fC03>
<fC03 i1="14" i2="2" l="FRE"><s0>Réservoir</s0>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="2" l="ENG"><s0>reservoirs</s0>
<s5>14</s5>
</fC03>
<fC03 i1="15" i2="2" l="FRE"><s0>Recyclage</s0>
<s5>15</s5>
</fC03>
<fC03 i1="15" i2="2" l="ENG"><s0>recycling</s0>
<s5>15</s5>
</fC03>
<fC03 i1="15" i2="2" l="SPA"><s0>Reconversión</s0>
<s5>15</s5>
</fC03>
<fC03 i1="16" i2="2" l="FRE"><s0>Cumulat</s0>
<s5>16</s5>
</fC03>
<fC03 i1="16" i2="2" l="ENG"><s0>cumulates</s0>
<s5>16</s5>
</fC03>
<fC03 i1="16" i2="2" l="SPA"><s0>Cumulofídica</s0>
<s5>16</s5>
</fC03>
<fC03 i1="17" i2="2" l="FRE"><s0>Plagioclase</s0>
<s2>NZ</s2>
<s5>17</s5>
</fC03>
<fC03 i1="17" i2="2" l="ENG"><s0>plagioclase</s0>
<s2>NZ</s2>
<s5>17</s5>
</fC03>
<fC03 i1="17" i2="2" l="SPA"><s0>Plagioclasa</s0>
<s2>NZ</s2>
<s5>17</s5>
</fC03>
<fC03 i1="18" i2="2" l="FRE"><s0>Cristal</s0>
<s5>18</s5>
</fC03>
<fC03 i1="18" i2="2" l="ENG"><s0>crystals</s0>
<s5>18</s5>
</fC03>
<fC03 i1="18" i2="2" l="SPA"><s0>Cristal</s0>
<s5>18</s5>
</fC03>
<fC03 i1="19" i2="2" l="FRE"><s0>Cristallisation fractionnée</s0>
<s5>19</s5>
</fC03>
<fC03 i1="19" i2="2" l="ENG"><s0>fractional crystallization</s0>
<s5>19</s5>
</fC03>
<fC03 i1="19" i2="2" l="SPA"><s0>Cristalización fraccionada</s0>
<s5>19</s5>
</fC03>
<fC03 i1="20" i2="2" l="FRE"><s0>Viscosité</s0>
<s5>20</s5>
</fC03>
<fC03 i1="20" i2="2" l="ENG"><s0>viscosity</s0>
<s5>20</s5>
</fC03>
<fC03 i1="20" i2="2" l="SPA"><s0>Viscosidad</s0>
<s5>20</s5>
</fC03>
<fC03 i1="21" i2="2" l="FRE"><s0>Réduction</s0>
<s5>21</s5>
</fC03>
<fC03 i1="21" i2="2" l="ENG"><s0>reduction</s0>
<s5>21</s5>
</fC03>
<fC03 i1="22" i2="2" l="FRE"><s0>Grèce</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC03 i1="22" i2="2" l="ENG"><s0>Greece</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC03 i1="22" i2="2" l="SPA"><s0>Grecia</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC07 i1="01" i2="2" l="FRE"><s0>Pyroclastite</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="01" i2="2" l="ENG"><s0>pyroclastics</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="02" i2="2" l="FRE"><s0>Roche volcanique</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="02" i2="2" l="ENG"><s0>volcanic rocks</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="02" i2="2" l="SPA"><s0>Roca volcánica</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="03" i2="2" l="FRE"><s0>Roche ignée</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="03" i2="2" l="ENG"><s0>igneous rocks</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="03" i2="2" l="SPA"><s0>Roca ignea</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="04" i2="2" l="FRE"><s0>Andésite</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="04" i2="2" l="ENG"><s0>andesites</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="04" i2="2" l="SPA"><s0>Andesita</s0>
<s2>NV</s2>
</fC07>
<fC07 i1="05" i2="2" l="FRE"><s0>Feldspath</s0>
<s2>NZ</s2>
</fC07>
<fC07 i1="05" i2="2" l="ENG"><s0>feldspar</s0>
<s2>NZ</s2>
</fC07>
<fC07 i1="05" i2="2" l="SPA"><s0>Feldespato</s0>
<s2>NZ</s2>
</fC07>
<fC07 i1="06" i2="2" l="FRE"><s0>Tectosilicate</s0>
<s2>NZ</s2>
</fC07>
<fC07 i1="06" i2="2" l="ENG"><s0>framework silicates</s0>
<s2>NZ</s2>
</fC07>
<fC07 i1="07" i2="2" l="FRE"><s0>Silicate</s0>
<s2>NZ</s2>
</fC07>
<fC07 i1="07" i2="2" l="ENG"><s0>silicates</s0>
<s2>NZ</s2>
</fC07>
<fC07 i1="07" i2="2" l="SPA"><s0>Silicato</s0>
<s2>NZ</s2>
</fC07>
<fC07 i1="08" i2="2" l="FRE"><s0>Europe Sud</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="08" i2="2" l="ENG"><s0>Southern Europe</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="08" i2="2" l="SPA"><s0>Europa Sur</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="09" i2="2" l="FRE"><s0>Europe</s0>
<s2>564</s2>
</fC07>
<fC07 i1="09" i2="2" l="ENG"><s0>Europe</s0>
<s2>564</s2>
</fC07>
<fC07 i1="09" i2="2" l="SPA"><s0>Europa</s0>
<s2>564</s2>
</fC07>
<fN21><s1>212</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
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<server><NO>PASCAL 12-0287116 INIST</NO>
<ET>Inverse differentiation pathway by multiple mafic magma refilling in the last magmatic activity of Nisyros Volcano, Greece</ET>
<AU>BRASCHI (Eleonora); FRANCALANCI (Lorella); VOUGIOUKALAKIS (Georges E.)</AU>
<AF>Dipartimento di Scienze della Terra, Università degli Studi di Firenze, via G. La Pira 4/50121 Firenze/Italie (1 aut., 2 aut.); C.N.R., Istituto di Geoscience e Georisorse, sezione di Firenze/Firenze/Italie (2 aut.); IGME, 3rd Entrance Olympic village/Aharne, 13637 Athens/Grèce (3 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Bulletin of volcanology : (Print); ISSN 0258-8900; Coden BUVOEW; Allemagne; Da. 2012; Vol. 74; No. 5; Pp. 1083-1100; Bibl. 1 p.1/4</SO>
<LA>Anglais</LA>
<EA>Based on detailed field, petrographic, chemical, and isotopic data, this paper shows that the youngest magmas of the active Nisyros volcano (South Aegean Arc, Greece) are an example of transition from rhyolitic to less evolved magmas by multiple refilling with mafic melts, triggering complex magma interaction processes. The final magmatic activity of Nisyros was characterized by sub-Plinian caldera-forming eruption (40 ka), emplacing the Upper Pumice (UP) rhyolitic deposits, followed by the extrusion of rhyodacitic post-caldera domes (about 31- 10 ka). The latter are rich in magmatic enclaves with textural and compositional (basaltic-andesite to andesite) characteristics that reveal they are quenched portions of mafic magmas included in a cooler more evolved melt. Dome-lavas have different chemical, isotopic, and mineralogical characteristics from the enclaves. The latter have lower <sup>87</sup>
Sr/<sup>86</sup>
Sr and higher <sup>143</sup>
 Nd<sup>/ 1</sup>
44 Nd values than dome-lavas. Silica contents and <sup>87</sup>
Sr/<sup>86</sup>
Sr values decrease with time among dome-lavas and enclaves. Micro-scale mingling processes caused by enclave crumbling and by widespread mineral exchanges increase from the oldest to the youngest domes, together with enclave content. We demonstrate that the dome-lavas are multi-component magmas formed by progressive mingling/mixing processes between a rhyolitic component (post-UP) and the enclave-forming mafic magmas refilling the felsic reservoir (from 15 wt.% to 40 wt.% of mafic component with time). We recognize that only the more evolved enclave magmas contribute to this process, in which recycling of cumulate plagioclase crystals is also involved. The post-UP end-member derives by fractional crystallization from the magmas leftover after the previous UP eruptions. The enclave magma differentiation develops mainly by fractional crystallization associated with multiple mixing with mafic melts changing their composition with time. A time-related picture of the relationships between dome-lavas and relative enclaves is proposed, suggesting a delay between a mafic magma input and the relative dome outpouring. We also infer that the magma viscosity reduction by re-heating allows dome extrusion without explosive activity.</EA>
<CC>001E01F01; 001E01O02; 222A01; 226B02</CC>
<FD>Différenciation; Magma; Volcan; Matière fondue; Eruption type plinien; Caldeira; Ponce; Extrusion; Dôme; Andésite basaltique; Lave; Silice; Mixage; Réservoir; Recyclage; Cumulat; Plagioclase; Cristal; Cristallisation fractionnée; Viscosité; Réduction; Grèce</FD>
<FG>Pyroclastite; Roche volcanique; Roche ignée; Andésite; Feldspath; Tectosilicate; Silicate; Europe Sud; Europe</FG>
<ED>differentiation; magmas; volcanoes; melts; plinian-type eruptions; calderas; pumice; extrusions; domes; basaltic andesite; lava; silica; mixing; reservoirs; recycling; cumulates; plagioclase; crystals; fractional crystallization; viscosity; reduction; Greece</ED>
<EG>pyroclastics; volcanic rocks; igneous rocks; andesites; feldspar; framework silicates; silicates; Southern Europe; Europe</EG>
<SD>Magma; Volcán; Producto fundido; Caldera; Piedra pómez; Domo; Lava; Sílice; Mezcla; Reconversión; Cumulofídica; Plagioclasa; Cristal; Cristalización fraccionada; Viscosidad; Grecia</SD>
<LO>INIST-2715.354000505268140080</LO>
<ID>12-0287116</ID>
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   |texte=   Inverse differentiation pathway by multiple mafic magma refilling in the last magmatic activity of Nisyros Volcano, Greece
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	Serveur d'exploration Nissiros
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Serveur d'exploration Nissiros

Inverse differentiation pathway by multiple mafic magma refilling in the last magmatic activity of Nisyros Volcano, Greece

Inverse differentiation pathway by multiple mafic magma refilling in the last magmatic activity of Nisyros Volcano, Greece

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