Melt inclusions track melt evolution and degassing of Etnean magmas in the last 15 ka

Mimma Emanuela Gennaro, Silvio Giuseppe Rotolo, Giada Iacono-Marziano, Marcello Liotta, Andrea L. Rizzo, Caroline Martel, Antonio Paonita, Emanuela Gennaro, Silvio G. Rotolo, Michel Pichavant, Andrea Luca Rizzo, Antonio Paonita, Giada Iacono Marziano, Marcello Liotta

Risultato della ricerca: Article

2 Citazioni (Scopus)

Abstract

We present major elements compositions and volatiles contents of olivine-hosted melt inclusions from Etna volcano (Italy), which extend the existing database with the aim of interpreting the chemical variability of Etnean magmas over the last 15 ka. Olivine phenocrysts were selected from the most primitive Fall Stratified (FS) eruptive products of picritic composition (Mg# = 67–70, Fo 89–91 ), the Mt. Spagnolo eccentric lavas (Mg# = 52–64, Fo 82–88 ) and among the more recent 2002–2013 eruptive products (Mg# = 33–53, Fo 68–83 ). Crystal fractionation and degassing processes were modeled at temperatures of 1050–1300 °C, pressures <500 MPa, and oxygen fugacity between 1 and 2 log units above the nickel-nickel oxide buffer, in order to interpret melt inclusions data. Melt inclusions show a great variability in major elements chemistry (e.g., 44–57 wt% SiO 2 , 3–16 wt% CaO, 4–13 wt% FeO, 2–12 wt% MgO, 1–6 wt% K 2 O), designating a continuous differentiation trend from FS toward 2013 entrapped melts, which is mostly reproduced by the fractional crystallization of olivine + spinel + clinopyroxene ± plagioclase, in order of appearance. Volatile contents in the glass inclusions are also extremely variable, with maxima up to 6 wt% H 2 O and 0.6 wt% CO 2 in FS melt inclusions, and up to 0.43 wt% S in Mt. Spagnolo inclusions. H 2 O and CO 2 contents in the melt inclusions suggest minimum entrapment depths of 4–19 km (below crater level) for FS inclusions and <10 km for the 2002–2013 trachybasalts. Petrological arguments coupled to the modeling of fractional crystallization and degassing processes concur to suggest that magmas from Mt. Spagnolo and the recent eruptions may be produced by differentiation from the most primitive volatile-rich FS magma along variable P-T paths, occasionally accompanied by secondary processes as crustal assimilation, mixing, and CO 2 flushing. We do not exclude the occurrence of source processes at Etna, e.g., variable degrees of mantle melting and/or variable degrees of mantle contamination, already proposed by previous authors. Our data, nevertheless, suggest that the first-order features of the Etnean magmas erupted in the last 15 ka can be modeled by differentiation through fractional crystallization and degassing.
Lingua originaleEnglish
pagine (da-a)716-732
Numero di pagine17
RivistaDefault journal
Volume324-325
Stato di pubblicazionePublished - 2019

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

Cita questo

Gennaro, M. E., Rotolo, S. G., Iacono-Marziano, G., Liotta, M., Rizzo, A. L., Martel, C., ... Liotta, M. (2019). Melt inclusions track melt evolution and degassing of Etnean magmas in the last 15 ka. Default journal, 324-325, 716-732.

Melt inclusions track melt evolution and degassing of Etnean magmas in the last 15 ka. / Gennaro, Mimma Emanuela; Rotolo, Silvio Giuseppe; Iacono-Marziano, Giada; Liotta, Marcello; Rizzo, Andrea L.; Martel, Caroline; Paonita, Antonio; Gennaro, Emanuela; Rotolo, Silvio G.; Pichavant, Michel; Rizzo, Andrea Luca; Paonita, Antonio; Iacono Marziano, Giada; Liotta, Marcello.

In: Default journal, Vol. 324-325, 2019, pag. 716-732.

Risultato della ricerca: Article

Gennaro, ME, Rotolo, SG, Iacono-Marziano, G, Liotta, M, Rizzo, AL, Martel, C, Paonita, A, Gennaro, E, Rotolo, SG, Pichavant, M, Rizzo, AL, Paonita, A, Iacono Marziano, G & Liotta, M 2019, 'Melt inclusions track melt evolution and degassing of Etnean magmas in the last 15 ka', Default journal, vol. 324-325, pagg. 716-732.
Gennaro ME, Rotolo SG, Iacono-Marziano G, Liotta M, Rizzo AL, Martel C e altri. Melt inclusions track melt evolution and degassing of Etnean magmas in the last 15 ka. Default journal. 2019;324-325:716-732.
Gennaro, Mimma Emanuela ; Rotolo, Silvio Giuseppe ; Iacono-Marziano, Giada ; Liotta, Marcello ; Rizzo, Andrea L. ; Martel, Caroline ; Paonita, Antonio ; Gennaro, Emanuela ; Rotolo, Silvio G. ; Pichavant, Michel ; Rizzo, Andrea Luca ; Paonita, Antonio ; Iacono Marziano, Giada ; Liotta, Marcello. / Melt inclusions track melt evolution and degassing of Etnean magmas in the last 15 ka. In: Default journal. 2019 ; Vol. 324-325. pagg. 716-732.
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title = "Melt inclusions track melt evolution and degassing of Etnean magmas in the last 15 ka",
abstract = "We present major elements compositions and volatiles contents of olivine-hosted melt inclusions from Etna volcano (Italy), which extend the existing database with the aim of interpreting the chemical variability of Etnean magmas over the last 15 ka. Olivine phenocrysts were selected from the most primitive Fall Stratified (FS) eruptive products of picritic composition (Mg# = 67–70, Fo 89–91 ), the Mt. Spagnolo eccentric lavas (Mg# = 52–64, Fo 82–88 ) and among the more recent 2002–2013 eruptive products (Mg# = 33–53, Fo 68–83 ). Crystal fractionation and degassing processes were modeled at temperatures of 1050–1300 °C, pressures <500 MPa, and oxygen fugacity between 1 and 2 log units above the nickel-nickel oxide buffer, in order to interpret melt inclusions data. Melt inclusions show a great variability in major elements chemistry (e.g., 44–57 wt{\%} SiO 2 , 3–16 wt{\%} CaO, 4–13 wt{\%} FeO, 2–12 wt{\%} MgO, 1–6 wt{\%} K 2 O), designating a continuous differentiation trend from FS toward 2013 entrapped melts, which is mostly reproduced by the fractional crystallization of olivine + spinel + clinopyroxene ± plagioclase, in order of appearance. Volatile contents in the glass inclusions are also extremely variable, with maxima up to 6 wt{\%} H 2 O and 0.6 wt{\%} CO 2 in FS melt inclusions, and up to 0.43 wt{\%} S in Mt. Spagnolo inclusions. H 2 O and CO 2 contents in the melt inclusions suggest minimum entrapment depths of 4–19 km (below crater level) for FS inclusions and <10 km for the 2002–2013 trachybasalts. Petrological arguments coupled to the modeling of fractional crystallization and degassing processes concur to suggest that magmas from Mt. Spagnolo and the recent eruptions may be produced by differentiation from the most primitive volatile-rich FS magma along variable P-T paths, occasionally accompanied by secondary processes as crustal assimilation, mixing, and CO 2 flushing. We do not exclude the occurrence of source processes at Etna, e.g., variable degrees of mantle melting and/or variable degrees of mantle contamination, already proposed by previous authors. Our data, nevertheless, suggest that the first-order features of the Etnean magmas erupted in the last 15 ka can be modeled by differentiation through fractional crystallization and degassing.",
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author = "Gennaro, {Mimma Emanuela} and Rotolo, {Silvio Giuseppe} and Giada Iacono-Marziano and Marcello Liotta and Rizzo, {Andrea L.} and Caroline Martel and Antonio Paonita and Emanuela Gennaro and Rotolo, {Silvio G.} and Michel Pichavant and Rizzo, {Andrea Luca} and Antonio Paonita and {Iacono Marziano}, Giada and Marcello Liotta",
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TY - JOUR

T1 - Melt inclusions track melt evolution and degassing of Etnean magmas in the last 15 ka

AU - Gennaro, Mimma Emanuela

AU - Rotolo, Silvio Giuseppe

AU - Iacono-Marziano, Giada

AU - Liotta, Marcello

AU - Rizzo, Andrea L.

AU - Martel, Caroline

AU - Paonita, Antonio

AU - Gennaro, Emanuela

AU - Rotolo, Silvio G.

AU - Pichavant, Michel

AU - Rizzo, Andrea Luca

AU - Paonita, Antonio

AU - Iacono Marziano, Giada

AU - Liotta, Marcello

PY - 2019

Y1 - 2019

N2 - We present major elements compositions and volatiles contents of olivine-hosted melt inclusions from Etna volcano (Italy), which extend the existing database with the aim of interpreting the chemical variability of Etnean magmas over the last 15 ka. Olivine phenocrysts were selected from the most primitive Fall Stratified (FS) eruptive products of picritic composition (Mg# = 67–70, Fo 89–91 ), the Mt. Spagnolo eccentric lavas (Mg# = 52–64, Fo 82–88 ) and among the more recent 2002–2013 eruptive products (Mg# = 33–53, Fo 68–83 ). Crystal fractionation and degassing processes were modeled at temperatures of 1050–1300 °C, pressures <500 MPa, and oxygen fugacity between 1 and 2 log units above the nickel-nickel oxide buffer, in order to interpret melt inclusions data. Melt inclusions show a great variability in major elements chemistry (e.g., 44–57 wt% SiO 2 , 3–16 wt% CaO, 4–13 wt% FeO, 2–12 wt% MgO, 1–6 wt% K 2 O), designating a continuous differentiation trend from FS toward 2013 entrapped melts, which is mostly reproduced by the fractional crystallization of olivine + spinel + clinopyroxene ± plagioclase, in order of appearance. Volatile contents in the glass inclusions are also extremely variable, with maxima up to 6 wt% H 2 O and 0.6 wt% CO 2 in FS melt inclusions, and up to 0.43 wt% S in Mt. Spagnolo inclusions. H 2 O and CO 2 contents in the melt inclusions suggest minimum entrapment depths of 4–19 km (below crater level) for FS inclusions and <10 km for the 2002–2013 trachybasalts. Petrological arguments coupled to the modeling of fractional crystallization and degassing processes concur to suggest that magmas from Mt. Spagnolo and the recent eruptions may be produced by differentiation from the most primitive volatile-rich FS magma along variable P-T paths, occasionally accompanied by secondary processes as crustal assimilation, mixing, and CO 2 flushing. We do not exclude the occurrence of source processes at Etna, e.g., variable degrees of mantle melting and/or variable degrees of mantle contamination, already proposed by previous authors. Our data, nevertheless, suggest that the first-order features of the Etnean magmas erupted in the last 15 ka can be modeled by differentiation through fractional crystallization and degassing.

AB - We present major elements compositions and volatiles contents of olivine-hosted melt inclusions from Etna volcano (Italy), which extend the existing database with the aim of interpreting the chemical variability of Etnean magmas over the last 15 ka. Olivine phenocrysts were selected from the most primitive Fall Stratified (FS) eruptive products of picritic composition (Mg# = 67–70, Fo 89–91 ), the Mt. Spagnolo eccentric lavas (Mg# = 52–64, Fo 82–88 ) and among the more recent 2002–2013 eruptive products (Mg# = 33–53, Fo 68–83 ). Crystal fractionation and degassing processes were modeled at temperatures of 1050–1300 °C, pressures <500 MPa, and oxygen fugacity between 1 and 2 log units above the nickel-nickel oxide buffer, in order to interpret melt inclusions data. Melt inclusions show a great variability in major elements chemistry (e.g., 44–57 wt% SiO 2 , 3–16 wt% CaO, 4–13 wt% FeO, 2–12 wt% MgO, 1–6 wt% K 2 O), designating a continuous differentiation trend from FS toward 2013 entrapped melts, which is mostly reproduced by the fractional crystallization of olivine + spinel + clinopyroxene ± plagioclase, in order of appearance. Volatile contents in the glass inclusions are also extremely variable, with maxima up to 6 wt% H 2 O and 0.6 wt% CO 2 in FS melt inclusions, and up to 0.43 wt% S in Mt. Spagnolo inclusions. H 2 O and CO 2 contents in the melt inclusions suggest minimum entrapment depths of 4–19 km (below crater level) for FS inclusions and <10 km for the 2002–2013 trachybasalts. Petrological arguments coupled to the modeling of fractional crystallization and degassing processes concur to suggest that magmas from Mt. Spagnolo and the recent eruptions may be produced by differentiation from the most primitive volatile-rich FS magma along variable P-T paths, occasionally accompanied by secondary processes as crustal assimilation, mixing, and CO 2 flushing. We do not exclude the occurrence of source processes at Etna, e.g., variable degrees of mantle melting and/or variable degrees of mantle contamination, already proposed by previous authors. Our data, nevertheless, suggest that the first-order features of the Etnean magmas erupted in the last 15 ka can be modeled by differentiation through fractional crystallization and degassing.

KW - Degassing

KW - Etna

KW - Geochemistry and Petrology

KW - Geology

KW - Melt differentiation

KW - Silicate melt inclusions

KW - Volatile content

UR - http://hdl.handle.net/10447/354638

UR - http://www.journals.elsevier.com/lithos/

M3 - Article

VL - 324-325

SP - 716

EP - 732

JO - Default journal

JF - Default journal

ER -