Geochemistry, Geophysics, Geosystems

Cover image for Geochemistry, Geophysics, Geosystems

February 2013

Volume 14, Issue 2

Pages 265–487

  1. Regular Articles

    1. Top of page
    2. Regular Articles
    3. Technical Brief
    4. Regular Articles
    5. Research Letters
    6. Regular Articles
    1. Oligocene-Miocene magnetic stratigraphy carried by biogenic magnetite at sites U1334 and U1335 (equatorial Pacific Ocean) (pages 265–282)

      J. E. T. Channell, C. Ohneiser, Y. Yamamoto and M. S. Kesler

      Article first published online: 4 FEB 2013 | DOI: 10.1029/2012GC004429

      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image

      Key Points

      • Oligocene-Miocene magnetic stratigraphy from equatorial Pacific
      • Evidence for biogenic magnetite
      • Oligocene-Miocene polarity timescales
    2. Short migration of methane into a gas hydrate-bearing sand layer at Walker Ridge, Gulf of Mexico (pages 283–291)

      Ann E. Cook and Alberto Malinverno

      Article first published online: 21 FEB 2013 | DOI: 10.1002/ggge.20040

      • image
      • image
      • image
      • image

      Key Points

      • Short migration is the diffusion of methane over meter scales into sands
      • Methane generation in surrounding muds and enough time for diffusion is required
      • High saturations of gas hydrate in sand can be explained by short migration
    3. Weathering geochemistry and Sr-Nd fingerprints of equatorial upper Nile and Congo muds (pages 292–316)

      Eduardo Garzanti, Marta Padoan, Massimo Setti, Yani Najman, Luigi Peruta and Igor M. Villa

      Article first published online: 21 FEB 2013 | DOI: 10.1002/ggge.20060

      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image

      Key Points

      • Integrated mineralogical-geochemical study of weathering in equatorial Africa
      • Composition of river muds reflects weathering intensity and its controls
      • Contrasting behavior of weathering indices quantifies recycling
    4. Trophic regions of a hydrothermal plume dispersing away from an ultramafic-hosted vent-system: Von Damm vent-site, Mid-Cayman Rise (pages 317–327)

      Sarah A. Bennett, Max Coleman, Julie A. Huber, Emily Reddington, James C. Kinsey, Cameron McIntyre, Jeffrey S. Seewald and Christopher R. German

      Article first published online: 22 FEB 2013 | DOI: 10.1002/ggge.20063

      • image
      • image
      • image
      • image
      • image

      Key Points

      • Carbon cycling in an ultramafic hosted hydrothermal plume
      • Identification of methanotrophy as a result of lower than expected methane
      • Hypothesis of a microbial food web within a dispersing plume
    5. Rare earth element concentrations and Nd isotopes in the Southeast Pacific Ocean (pages 328–341)

      C. Jeandel, H. Delattre, M. Grenier, C. Pradoux and F. Lacan

      Article first published online: 24 FEB 2013 | DOI: 10.1029/2012GC004309

      • image
      • image
      • image
      • image
      • image
      • image

      Key Points

      • New REE and Nd isotope data in the remote South-East Pacific
      • Hydrothermal vents might affect Nd isotopes and concentrations of deep waters
      • Data allow characterizing the source of subtropical waters flowing westward
    6. Thermodynamic model for partial melting of peridotite by system energy minimization (pages 342–366)

      K. Ueki and H. Iwamori

      Article first published online: 26 FEB 2013 | DOI: 10.1029/2012GC004143

      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image

      Key Points

      • An algorithm to calculate phase equilibria by system energy minimization
      • Thermodynamic parameters for melt are newly calibrated at melting P-T condition
      • Melting phase relation of peridotite at 1 GPa is well reproduced
    7. Slow slip and tremor search at Kilauea Volcano, Hawaii (pages 367–384)

      E. K. Montgomery-Brown, C. H. Thurber, C. J. Wolfe and P. Okubo

      Article first published online: 27 FEB 2013 | DOI: 10.1002/ggge.20044

      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image

      Key Points

      • Slow slip events at Kilauea Volcano are not associated with tectonic tremor
      • Different tremor detecting methods produce similar results at Kilauea
      • Slow slip without tremor provide physical limits on favorable tremor conditions
    8. Timing, origin and emplacement dynamics of mass flows offshore of SE Montserrat in the last 110 ka: Implications for landslide and tsunami hazards, eruption history, and volcanic island evolution (pages 385–406)

      J. Trofimovs, P. J. Talling, J. K. Fisher, R. S. J. Sparks, S. F. L. Watt, M. B. Hart, C. W. Smart, A. Le Friant, M. Cassidy, S. G. Moreton and M. J. Leng

      Article first published online: 27 FEB 2013 | DOI: 10.1002/ggge.20052

      • image
      • image
      • image
      • image
      • image
      • image
      • image

      Key Points

      • New multi-disciplinary offshore stratigraphy reconstruction
      • Identifies temporal variation in eruption style and preservation
      • A culmination of multi-disciplinary approaches used to refine volcano history
    9. Rock magnetic properties of dendrites: insights from MFM imaging and implications for paleomagnetic studies (pages 407–421)

      Ron Shaar and Joshua M. Feinberg

      Article first published online: 27 FEB 2013 | DOI: 10.1002/ggge.20053

      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image

      Key Points

      • Micromagnetic domain structure of dendrites is observed using MFM
      • Dendrites built from interconnected octahedra can have SD-like magnetization
      • Similarly oriented domain walls in MD dendrites give rise to anisotropy
  2. Technical Brief

    1. Top of page
    2. Regular Articles
    3. Technical Brief
    4. Regular Articles
    5. Research Letters
    6. Regular Articles
    1. DIPRA: A user-friendly program to model multi-element diffusion in olivine with applications to timescales of magmatic processes (pages 422–431)

      Társilo Girona and Fidel Costa

      Article first published online: 28 FEB 2013 | DOI: 10.1029/2012GC004427

      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image

      Key Points

      • User-friendly tool to model chemical zoning in olivine
      • Easy and fast determination of timescales of magmatic processes
      • Very useful tool for teaching in higher education courses
  3. Regular Articles

    1. Top of page
    2. Regular Articles
    3. Technical Brief
    4. Regular Articles
    5. Research Letters
    6. Regular Articles
    1. Soil gas radon emissions and volcanic activity at El Hierro (Canary Islands): The 2011-2012 submarine eruption (pages 432–447)

      Germán D. Padilla, Pedro A. Hernández, Eleazar Padrón, José Barrancos, Nemesio M. Pérez, Gladys Melián, Dácil Nolasco, Samara Dionis, Fátima Rodríguez, David Calvo and Iñigo Hernández

      Article first published online: 28 FEB 2013 | DOI: 10.1029/2012GC004375

      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image
      • image

      Key Points

      • Increases in soil Rn activity were observed before the submarine eruption onset
  4. Research Letters

    1. Top of page
    2. Regular Articles
    3. Technical Brief
    4. Regular Articles
    5. Research Letters
    6. Regular Articles
    1. Kimberlite eruptions as triggers for early Cenozoic hyperthermals (pages 448–456)

      Michael V. Patterson and Don Francis

      Article first published online: 16 APR 2013 | DOI: 10.1002/ggge.20054

      • image
      • image
      • image
      • image

      Key Point

      • Kimberlite degassing provides large amounts of CO2 to the atmosphere
  5. Regular Articles

    1. Top of page
    2. Regular Articles
    3. Technical Brief
    4. Regular Articles
    5. Research Letters
    6. Regular Articles
    1. Toward a semantic web of paleoclimatology (pages 457–469)

      Julien Emile-Geay and Jason A. Eshleman

      Article first published online: 28 FEB 2013 | DOI: 10.1002/ggge.20067

      • image
      • image
      • image
      • image

      Key Points

      • The paleoclimate database should be structured in a machine-readable format
      • This is possible using semantic technologies and simple design principles
      • This format would accelerate the inference made from paleoclimate observations
    2. Numerical modeling of geochemical variations caused by crustal relamination (pages 470–487)

      Katharina Vogt, Antonio Castro and Taras Gerya

      Article first published online: 28 FEB 2013 | DOI: 10.1002/ggge.20072

      • image
      • image
      • image
      • image
      • image
      • image

      Key Points

      • Crustal relamination contributes to the growth of the continental crust
      • Composite diapirs account for the bulk composition of the continental crust
      • Melts from composite diapris show distinct isotopic variations

SEARCH

SEARCH BY CITATION