Geochemistry, Geophysics, Geosystems


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      OIB/seamount recycling as a possible process for E-MORB genesis

      Marc Ulrich, Christophe Hémond, Philippe Nonnotte and Klaus Peter Jochum

      Version of Record online: 26 JUN 2012 | DOI: 10.1029/2012GC004078

      Key Points

      • We propose a new model accounting for E-MORB genesis
      • We investigate the nature of the mantle heterogeneity at 14degN in the MAR
      • The OIB/seamount recycling model is applicable to other ridges in the world
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      Melting and channelized magmatic flow in chemically heterogeneous, upwelling mantle

      S. M. Weatherley and R. F. Katz

      Version of Record online: 2 MAY 2012 | DOI: 10.1029/2011GC003989

      Key Points

      • Channelized magmatic flow may be a consequence of mantle heterogeneity
      • Conservation of energy is an important ingredient of models of magma dynamics
      • Thermal diffusion and reactive flow power melting within channels
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      The effects of re-homogenization on plagioclase hosted melt inclusions

      Roger L. Nielsen

      Version of Record online: 27 OCT 2011 | DOI: 10.1029/2011GC003822

      Key Points

      • Rehomogenization does not change the minor element content of melt inclusions
      • The range of minor element content of melt inclusions is not caused by reheating
      • Great care must be taken in the interpretation of all melt inclusion data
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      The energetics of melting fertile heterogeneities within the depleted mantle

      Richard F. Katz and John F. Rudge

      Version of Record online: 21 OCT 2011 | DOI: 10.1029/2011GC003834

      Key Points

      • Thermal equilibration of fertile mantle enclaves is related to a Peclet number
      • Fertile enclaves can melt 50%–80% before depleted upper mantle begins to melt
      • Such melting can cool the mantle surrounding the enclave by up to 60 degrees
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      Multiscale chemical heterogeneities beneath the eastern Southwest Indian Ridge (52°E–68°E): Trace element compositions of along-axis dredged peridotites

      Monique Seyler, Daniele Brunelli, Michael J. Toplis and Catherine Mével

      Version of Record online: 15 SEP 2011 | DOI: 10.1029/2011GC003585

      Key Points

      • Some peridotites equilibrated in the shallow mantle with garnet-derived melts
      • Most peridotites equilibrated with a mixture of garnet- and spinel-derived melts
      • High subkilometer scale compositional variability reflects a heterogeneous MORB source
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      Insights into the Galápagos plume from uranium-series isotopes of recently erupted basalts

      Heather K. Handley, Simon Turner, Kim Berlo, Christoph Beier and Alberto E. Saal

      Version of Record online: 9 SEP 2011 | DOI: 10.1029/2011GC003676

      Key Points

      • The U/Th ratio of the lavas is controlled by source heterogeneity
      • 210Pb/226Ra correlates with Sr isotope and Nb/Zr ratios
      • 226Ra/230Th activity ratios are modified at shallow depth
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      U-Th-Ra disequilibria and the extent of off-axis volcanism across the East Pacific Rise at 9°30′N, 10°30′N, and 11°20′N

      Simon Turner, Christoph Beier, Yaoling Niu and Craig Cook

      Version of Record online: 28 JUL 2011 | DOI: 10.1029/2010GC003403

      Key Points

      • The study represents a follow-up to the controversial study of Zou et al
      • The results indicate that many of their results were erroneous
      • Some magmatism occurs off axis, out to at least 30 km
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      Geochemical variations at intraplate hot spots caused by variable melting of a veined mantle plume

      Todd Anthony Bianco, Garrett Ito, Jeroen van Hunen, Maxim D. Ballmer and John J. Mahoney

      Version of Record online: 28 JUL 2011 | DOI: 10.1029/2011GC003658

      Key Points

      • Plume dynamics and melting cause variations in intraplate hot spot compositions
      • Predicted variations explain many aspects of observations at real hot spots
      • Hot spot compositions do not require large, strongly distinct reservoirs
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      Insights into mantle composition and mantle melting beneath mid-ocean ridges from postspreading volcanism on the fossil Galapagos Rise

      Karsten M. Haase, Marcel Regelous, Robert A. Duncan, Philipp A. Brandl, Nicole Stroncik and Ingo Grevemeyer

      Version of Record online: 11 MAY 2011 | DOI: 10.1029/2010GC003482

      Key Points

      • Magma generation continues after spreading ceased
      • Degree of melting decreases as mantle is cooled from surface
      • Chemical mantle heterogeneities dominate magma composition
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      Geochemical characteristics and origin of the HIMU reservoir: A possible mantle plume source in the lower mantle

      Takeshi Hanyu, Yoshiyuki Tatsumi, Ryoko Senda, Takashi Miyazaki, Qing Chang, Yuka Hirahara, Toshiro Takahashi, Hiroshi Kawabata, Katsuhiko Suzuki, Jun-Ichi Kimura and Shun'ichi Nakai

      Version of Record online: 26 FEB 2011 | DOI: 10.1029/2010GC003252

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      Petrology and Sr-Nd-Pb-He isotope geochemistry of postspreading lavas on fossil spreading axes off Baja California Sur, Mexico

      Liyan Tian, Paterno R. Castillo, Peter F. Lonsdale, Doshik Hahm and David R. Hilton

      Version of Record online: 24 FEB 2011 | DOI: 10.1029/2010GC003319

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      Low-productivity Hawaiian volcanism between Kaua‘i and O‘ahu

      Andrew R. Greene, Michael O. Garcia, Dominique Weis, Garrett Ito, Maia Kuga, Joel Robinson and Seiko Yamasaki

      Version of Record online: 23 NOV 2010 | DOI: 10.1029/2010GC003233

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      Porosity-driven convection and asymmetry beneath mid-ocean ridges

      Richard F. Katz

      Version of Record online: 10 NOV 2010 | DOI: 10.1029/2010GC003282

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      Time scales of melt extraction revealed by distribution of lava composition across a ridge axis

      Carole Cordier, Mathieu Benoit, Christophe Hémond, Jérôme Dyment, Bernard Le Gall, Anne Briais and Mitsuko Kitazawa

      Version of Record online: 10 JUL 2010 | DOI: 10.1029/2010GC003074

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      Control of the symmetry of plume-ridge interaction by spreading ridge geometry

      O. Shorttle, J. Maclennan and S. M. Jones

      Version of Record online: 2 JUL 2010 | DOI: 10.1029/2009GC002986

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      Rare gases in lavas from the ultraslow spreading Lena Trough, Arctic Ocean

      F. Nauret, M. Moreira and J. E. Snow

      Version of Record online: 26 JUN 2010 | DOI: 10.1029/2010GC003027

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      Influence of subducted components on back-arc melting dynamics in the Manus Basin

      Christoph Beier, Simon P. Turner, John M. Sinton and James B. Gill

      Version of Record online: 19 JUN 2010 | DOI: 10.1029/2010GC003037

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      Isotopic evidence for chaotic imprint in upper mantle heterogeneity

      Pietro Armienti and Daniela Gasperini

      Version of Record online: 11 MAY 2010 | DOI: 10.1029/2009GC002798

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      Source materials for inception stage Hawaiian magmas: Pb-He isotope variations for early Kilauea

      Takeshi Hanyu, Jun-Ichi Kimura, Maiko Katakuse, Andrew T. Calvert, Thomas W. Sisson and Shun'ichi Nakai

      Version of Record online: 11 MAR 2010 | DOI: 10.1029/2009GC002760

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