Schiavi, Federica et al. (2009) Degassing, crystallization and eruption dynamics at Stromboli: trace element and lithium isotopic evidence from 2003 ashes, Contributions to Mineralogy and Petrology, 159, 541-561, doi: 10.1007/s00410-009-0441-2. < 20100403102859038.admin > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    During its 1800-year-long persistent activity the Stromboli volcano has erupted a highly porphyritic (HP) volatile-poor scoriaceous magma and a low porphyritic (LP) volatile-rich pumiceous magma. The HP magma is erupted during normal Strombolian explosions and lava effusions, while the LP one is related to more energetic paroxysms. During the March–April 2003 explosive activity, Stromboli ejected two typologies of juvenile glassy ashes, namely highly vesicular LP shards and volatile-poor HP shards. Their textural and in situ chemical characteristics are used to unravel mutual relationships between HP and LP magmas, as well as magma dynamics within the shallow plumbing system. The mantle-normalized trace element patterns of both ash types show the typical arc-lava pattern; however, HP glasses possess incompatible element concentrations higher than LP glasses, along with Sr and Eu negative anomalies. HP shards are generally characterized by higher Li contents (to ~20 ppm) and lower δ7Li values (+1.2 to −3.8‰) with respect to LP shards (Li contents of 7–14 ppm and δ7Li ranging between +4.6 and +0.9‰). Fractional crystallization models based on major and trace element compositions, combined with a degassing model based on open-system Rayleigh distillation and on the assumption that melt/fluidDLi > 1, show that abundant (~30%) plagioclase precipitation and variable degrees of degassing can lead the more primitive LP magma to evolve toward a differentiated (isotopically lighter) HP magma ponding in the upper conduit and undergoing slow continuous degassing-induced crystallization. This study also evidences that in March 2003 Stromboli volcano poured out a small early volume of LP magma that traveled slower within the conduit with respect to later and larger volumes of fast ascending LP magma erupted during the April 5 paroxysm. The different ascent rates and cooling rates of the two LP magma batches (i.e., pre- and post-paroxysm) resulted in small, but detectable, differences in their chemical signatures. Finally, this study highlights the high potential of in situ investigations of juvenile glassy ashes in petrologic and geochemical monitoring the volcanic activity and of Li isotopes as tracers of degassing processes within the shallow plumbing system.

  • doi: 10.1007/s00410-009-0441-2
  • modified at 16 h ago


(a) Li isotopes_procedures of Moriguti and Nakamura (1998) on MC-ICP-MS Finnigan, Neptune
(b) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on Q-ICPMS Agilent 7500cs
Tixhr1325357757 thumb ST103 < 20180305113432-690138 >pub
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 89.23
  • description: Stromboli island; San Bartolo effusive event between 360BC and 7AD. Sample set ST94.8 consists of melt inclusions hosted in olivine crystals recovered from lava sample ST103 (Schiavi et al., 2012)
  • modified at 2020-04-10
Tixhr 1352674651 thumb ST79 < 20180305142033-692509 >pub
  • classification: volcanic:basaltic
  • physical-form: aliquot
  • quantity (g): 1.47
  • description: Stromboli island; eruption time after 3rd to 7th century AD; pumice.
  • modified at 2020-04-10
Tixhr 1947583647 thumb ST81 < 20180305141919-614119 >pub
  • classification: volcanic:basaltic
  • physical-form: aliquot
  • quantity (g): 1.54
  • description: Stromboli island; eruption time after 3rd to 7th century AD; pumice.
  • modified at 2020-04-10
Tixhr728136614 thumb ST82 < 20180305141806-920207 >pub
  • classification: volcanic:basaltic
  • physical-form: aliquot
  • quantity (g): 1.65
  • description: Stromboli island; eruption time after 3rd to 7th century AD; pumice.
  • modified at 2020-04-10
Tixhr1132921300 thumb STR317 < 20180305112813-314621 >pub
  • classification: volcanic:basaltic
  • physical-form: powder
  • quantity (g): 7.75
  • age (a): 17 (0)
  • description: Stromboli volcano; 2003 volcanic activity; LP pumice
  • modified at 2020-04-10
Tixhr1930292514 thumb STR010203 < 20180305112412-162287 >pub
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 96.03
  • age (a): 17 (0)
  • description: Stromboli volcano; 2003 volcanic activity
  • modified at 2020-04-10
Tixhr167521925 thumb STR170503 < 20180305112553-078976 >pub
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 83.07
  • age (a): 17 (0)
  • description: Stromboli volcano; 2003 volcanic activity
  • modified at 2020-04-10
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name spots global-id
caption ID assembly stone
Table 2 Li concentrations and Li isotopic compositions of whole-rock samples pub 20200410121449-897910 lithium (Fede 2009) 7
manual
  • name
  • Schiavi, Federica
  • Kobayashi, Katsura
  • Moriguti, Takuya
  • Nakamura, Eizo
  • Pompilio, Massimo
  • Tiepolo, Massimo
  • Vannucci, Riccardo