Geochemistry, Geophysics, Geosystems

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      Insight into volatile behavior at Nyamuragira volcano (D.R. Congo, Africa) through olivine-hosted melt inclusions

      Elisabet M. Head, Alison M. Shaw, Paul J. Wallace, Kenneth W. W. Sims and Simon A. Carn

      Article first published online: 4 OCT 2011 | DOI: 10.1029/2011GC003699

      Key Points

      • We present new melt inclusion data from five historic Nyamuragira eruptions
      • Satellite-based SO2 emissions are significantly larger than S in melt inclusions
      • Pre-entrapment degassing of melts/an additional source of S explain our results
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      Pulses of deformation reveal frequently recurring shallow magmatic activity beneath the Main Ethiopian Rift

      J. Biggs, I. D. Bastow, D. Keir and E. Lewi

      Article first published online: 10 SEP 2011 | DOI: 10.1029/2011GC003662

      Key Points

      • The volcanoes of the Main Ethiopian Rift are more active than previously known
      • Magmatic processes on year-to-decade timescales are common in continental rifts
      • Volcanic risk in Ethiopia is frequently neglected and requires further study
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      Three-dimensional geometry of concentric intrusive sheet swarms in the Geitafell and the Dyrfjöll volcanoes, eastern Iceland

      Steffi Burchardt, David C. Tanner, Valentin R. Troll, Michael Krumbholz and Ludvik E. Gustafsson

      Article first published online: 28 JUL 2011 | DOI: 10.1029/2011GC003527

      Key Points

      • We modeled inclined sheet swarms of the Geitafell and the Dyrfjoell volcanoes
      • Geitafell had one main magma chamber, while Dyrfjoell belongs to a volcanic cluster
      • Cone sheets help to constrain depth and location of magmatic sources
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      Thin oceanic crust and flood basalts: India-Seychelles breakup

      J. J. Armitage, J. S. Collier, T. A. Minshull and T. J. Henstock

      Article first published online: 12 MAY 2011 | DOI: 10.1029/2010GC003316

      Key Points

      • The Gop Rift formed at 71 Ma
      • Rifting migrated after formation of the Deccan Traps
      • Oceanic crust at breakup is thin due to rift history
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      Seismicity during lateral dike propagation: Insights from new data in the recent Manda Hararo–Dabbahu rifting episode (Afar, Ethiopia)

      R. Grandin, E. Jacques, A. Nercessian, A. Ayele, C. Doubre, A. Socquet, D. Keir, M. Kassim, A. Lemarchand and G. C. P. King

      Article first published online: 27 APR 2011 | DOI: 10.1029/2010GC003434

      Key Points

      • Horizontal migration of seismicity indicates lateral dike emplacement
      • Magma source is in the center of the segment, in analogy with mid-ocean ridges
      • Dike volumes and seismic energy release are sensitive to local tectonic stress
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      Organized melt, seismic anisotropy, and plate boundary lubrication

      Benjamin K. Holtzman and J.-Michael Kendall

      Article first published online: 29 DEC 2010 | DOI: 10.1029/2010GC003296

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      Birth of a volcanic margin off Argentina, South Atlantic

      Dieter Franke, Stefan Ladage, Michael Schnabel, Bernd Schreckenberger, Christian Reichert, Karl Hinz, Marcelo Paterlini, Juan de Abelleyra and Miguel Siciliano

      Article first published online: 12 FEB 2010 | DOI: 10.1029/2009GC002715

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      Lower crustal earthquakes near the Ethiopian rift induced by magmatic processes

      Derek Keir, Ian D. Bastow, Kathryn A. Whaler, Eve Daly, David G. Cornwell and Sophie Hautot

      Article first published online: 18 JUN 2009 | DOI: 10.1029/2009GC002382

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      Low lower crustal velocity across Ethiopia: Is the Main Ethiopian Rift a narrow rift in a hot craton?

      Katie M. Keranen, Simon L. Klemperer, Jordi Julia, Jesse F. Lawrence and Andy A. Nyblade

      Article first published online: 8 MAY 2009 | DOI: 10.1029/2008GC002293

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      Upper mantle seismic structure beneath the Ethiopian hot spot: Rifting at the edge of the African low-velocity anomaly

      I. D. Bastow, A. A. Nyblade, G. W. Stuart, T. O. Rooney and M. H. Benoit

      Article first published online: 18 DEC 2008 | DOI: 10.1029/2008GC002107