Schiavi, Federica et al. (2015) Geochemical heterogeneities in magma beneath Mount Etna recorded by 2001-2006 melt inclusions, Geochemistry, Geophysics, Geosystems, 16, 2109-2126, doi: 10.1002/2015GC005786. < 20150917164402-737647 > pub

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

  • abstract:

    We present a geochemical study on olivine and clinopyroxene-hosted melt inclusions (MIs) from 2001 to 2006 Etna basaltic lavas and pyroclastites. Three MI suites are distinguished on the basis of trace element fingerprinting. Type-1 MIs (from 2001 Upper South and 2002 Northeast vents) share their trace element signature with low-K lavas erupted before 1971. Critical trace element ratios (e.g., K/La, Ba/Nb), along with Pb isotope data of Type-1 MIs provide evidence for a heterogeneous mantle source resulting from mixing of three end-members with geochemical and isotopic characteristics of EM2, DMM, and HIMU components. Type-1 MIs composition does not support involvement of subduction-related components. Type-2 (from 2001 Lower and 2002 South vents) and Type-3 (2004 eruption) MIs reveal "ghost plagioclase signatures," namely lower concentrations in strongly incompatible elements, and positive Sr, Ba, and Eu anomalies. Both Type-1 and Type-2 MIs occur in 2006 olivines, which highlight the occurrence of mixing between Type-1 and Type-2 end-members. Type-2/Type-3 MIs testify to en route processes (plagioclase assimilation and volatile fluxing) peculiar for "deep dike fed" eruptions. The latter are strongly controlled by tectonics or flank instability that occasionally promote upraise of undegassed, more radiogenic primitive magma, which may interact with plagioclase-rich crystal mush/cumulates before erupting. Type-2/Type-3 MIs approach the less radiogenic Pb isotopic composition of plagioclase from prehistoric lavas, thus suggesting geochemical overprinting of present-day melts by older products released from distinct mantle sources. Our study emphasizes that MIs microanalysis offers new insights on both source characteristics and en route processes, allowing to a link between melt composition and magma dynamics.

  • summary:

    The geochemical study of olivine and clinopyroxene‐hosted MIs from 2001 to 2006 eruptions highlights MI capability to sample and preserve small volume melts with distinct geochemical and isotopic fingerprint. Our study offers new insights on both source characteristics of present‐day Etnean magmas and their en route processes, which might not be easily recognized at the whole‐rock scale, and allows to a link between melt composition and magma dynamics.

  • doi: 10.1002/2015GC005786
  • modified at 16 h ago


(a) XRF procedures of Takei (2002) on XRF PANalytical PW2400
(b) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on Q-ICPMS Agilent 7500cs
(c) Q-ICP-MS_procedures of Lu et al. (2007) on Q-ICPMS Agilent 7500cs
Img 4962 thumb E-02-S < 20140313090306-796243 >pub
  • IGSN: IEDRM00AH
  • classification: volcanic:basaltic
  • physical-form: powder
  • status: (unknown)
  • modified at 2020-01-29
Img 4958 thumb E-99 < 20140313090229-406274 >pub
  • IGSN: IEDRM00AD
  • classification: volcanic:basaltic
  • physical-form: powder
  • status: (unknown)
  • modified at 2020-01-29
Img 4964 thumb E-06 < 20140313090324-943852 >pub
  • IGSN: IEDRM00AK
  • classification: volcanic:basaltic
  • physical-form: powder
  • status: (unknown)
  • modified at 2020-01-29
Img 4961 thumb E-02-N < 20140313090257-967304 >pub
  • IGSN: IEDRM00AG
  • classification: volcanic:basaltic
  • physical-form: powder
  • status: (unknown)
  • modified at 2020-01-29
Img 4963 thumb E-04 < 20140313090315-954268 >pub
  • IGSN: IEDRM00AJ
  • classification: volcanic:basaltic
  • physical-form: powder
  • status: (unknown)
  • modified at 2020-01-29
Img 4965 thumb E-08 < 20140313090333-742100 >pub
  • IGSN: IEDRM00AM
  • classification: volcanic:basaltic
  • physical-form: powder
  • status: (unknown)
  • modified at 2020-01-29
Img 4959 thumb E-01-UV < 20140313090239-317044 >pub
  • IGSN: IEDRM00AE
  • classification: volcanic:basaltic
  • physical-form: powder
  • status: (unknown)
  • modified at 2020-01-29
Img 4960 thumb E-01-LV < 20140313090248-900549 >pub
  • IGSN: IEDRM00AF
  • classification: volcanic:basaltic
  • physical-form: powder
  • status: (unknown)
  • modified at 2020-01-29
Img 2203 thumb 2001UV < 20101004092741370.hkitagawa >pub
  • IGSN: IEDRM00A9
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 584.82
  • modified at 2017-05-23
Img 2206 thumb 1999 < 20101004092743658.hkitagawa >pub
  • IGSN: IEDRM00AC
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 160.73
  • modified at 2017-05-23
Img 2204 thumb 2004 < 20101004092741457.hkitagawa >pub
  • IGSN: IEDRM00AA
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 77.87
  • modified at 2017-05-23
Img 2205 thumb 2001LV < 20101004092741535.hkitagawa >pub
  • IGSN: IEDRM00AB
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 367.86
  • modified at 2017-05-23
Img 2202 thumb 2002NORD < 20101004092741285.hkitagawa >pub
  • IGSN: IEDRM00A8
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 371.17
  • modified at 2017-05-23
name box-type global-id
Etna Alberto 2010 pub container 20140313085231-530471
Mt. Etna pub container 20101013093458396.hkitagawa
name device size global-id
2001UV pub Q-ICPMS Agilent 7500cs 5 20180927144711-097495
2001UV pub XRF PANalytical PW2400 14 20180927144645-789922
2001UV pub Q-ICPMS Agilent 7500cs 24 20180927144658-814298
May-04 pub Q-ICPMS Agilent 7500cs 5 20180927144711-907828
2004-05 pub XRF PANalytical PW2400 14 20180927144645-389427
May-04 pub Q-ICPMS Agilent 7500cs 24 20180927144659-238420
2001 LV pub Q-ICPMS Agilent 7500cs 5 20180927144710-220586
2001LV pub XRF PANalytical PW2400 14 20180927144644-919039
2001 LV pub Q-ICPMS Agilent 7500cs 24 20180927144658-571906
2002-03NORD pub Q-ICPMS Agilent 7500cs 5 20180927144711-549395
2002-03NORD pub XRF PANalytical PW2400 14 20180927144645-033808
2002-03NORD pub Q-ICPMS Agilent 7500cs 24 20180927144659-941472
name spots global-id
caption ID assembly stone
Table 1: Major and trace element compositions of 2001-2006 lavas pub 20180927143632-796026 major-trace (Schiavi et al., 2015) 4
manual
  • name
  • Schiavi, Federica
  • Rosciglione, A.
  • Kitagawa, Hiroshi
  • Kobayashi, Katsura
  • Nakamura, E.
  • Nuccio, P. M.
  • Ottolini, L.
  • Paonita, A.
  • Vannucci, Riccardo