Bulletin of Volcanology

, Volume 74, Issue 5, pp 981–1004 | Cite as

Magma storage conditions beneath Dabbahu Volcano (Ethiopia) constrained by petrology, seismicity and satellite geodesy

  • L. Field
  • J. Blundy
  • R. A. Brooker
  • T. Wright
  • G. Yirgu
Research Article

Abstract

A variety of methods exist to constrain sub-volcanic storage conditions of magmas. Petrological, seismological and satellite geodetic methods are integrated to determine storage conditions of peralkaline magmas beneath Dabbahu Volcano, Afar, Ethiopia. Secondary ion mass spectrometry (SIMS) analysis of volatile contents in melt inclusions trapped within phenocrysts of alkali feldspar, clinopyroxene and olivine from pantellerite obsidians representing the youngest eruptive phase (<8 ka) show H2O contents ≤5.8 wt.% and CO2 contents generally below 500 ppm, although rarely as high as 1,500 ppm. Volatile saturation pressures (at 679–835°C) are in the range 43–207 MPa, consistent with published experimental data for similar pantellerites, which show that the phenocryst assemblage of alkali feldspar + cpx + aenigmatite ± ilmenite is stable at 100 to 150 MPa. Inferred magma storage depths for these historic eruptions are ~1–5 km below sea-level, consistent with the depths of earthquakes, associated with magma chamber deflation following a dyke intrusion in the period Oct 2005–Apr 2006. Interferometric synthetic aperture radar (InSAR) data for the same period reveal a broad ~20 km diameter area of uplift. Modelling of different geometries reveals that a series of stacked sills over a 1–5 km depth range best matches the InSAR data. The consistency of depth estimates based on petrological study of ancient eruptions and the seismicity, inflation and deflation of Dabbahu observed in relation to the dyking event of 2005, suggest a small but vertically extensive and potentially long-lived magma storage region.

Keywords

Melt inclusions Afar Magma storage Dabbahu Volatiles InSAR Peralkaline 

Supplementary material

445_2012_580_MOESM1_ESM.xlsx (37 kb)
ESM 1(XLSX 37 kb)
445_2012_580_MOESM2_ESM.pdf (98 kb)
ESM 2(PDF 97 kb)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • L. Field
    • 1
  • J. Blundy
    • 1
  • R. A. Brooker
    • 1
  • T. Wright
    • 2
  • G. Yirgu
    • 3
  1. 1.School of Earth SciencesUniversity of BristolBristolUK
  2. 2.School of Earth and EnvironmentUniversity of LeedsLeedsUK
  3. 3.Department of Earth SciencesUniversity of Addis AbabaAddis AbabaEthiopia

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