Geochemistry, Geophysics, Geosystems


  1. Regular Articles

    1. Top of page
    2. Regular Articles
    3. Research Articles
    1. Three-dimensional seismic structure of the Dragon Flag oceanic core complex at the ultraslow spreading Southwest Indian Ridge (49°39′E) (pages 4544–4563)

      Minghui Zhao, Xuelin Qiu, Jiabiao Li, Daniel Sauter, Aiguo Ruan, John Chen, Mathilde Cannat, Satish Singh, Jiazheng Zhang, Zhenli Wu and Xiongwei Niu

      Article first published online: 7 OCT 2013 | DOI: 10.1002/ggge.20264

      Key Points

      • ultraslow spreading Southwest Indian Ridge
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      Microseismicity of the Mid-Atlantic Ridge at 7°S–8°15′S and at the Logatchev Massif oceanic core complex at 14°40′N–14°50′N (pages 3532–3554)

      Ingo Grevemeyer, Timothy J. Reston and Stefan Moeller

      Article first published online: 5 SEP 2013 | DOI: 10.1002/ggge.20197

      Key Points

      • Seismicity yielded that earthquakes generally occur at the axis axis
      • At Logatchev Massif seismicity is shifted away from the ridge axis
      • Location of the Logatchev vents is controlled by faulting and serpentinization
    3. Mylonitic deformation at the Kane oceanic core complex: Implications for the rheological behavior of oceanic detachment faults (pages 3085–3108)

      Lars N. Hansen, Michael J. Cheadle, Barbara E. John, Susan M. Swapp, Henry J. B. Dick, Brian E. Tucholke and Maurice A. Tivey

      Article first published online: 28 AUG 2013 | DOI: 10.1002/ggge.20184

      Key Points

      • The detachment fault is defined by a 450 m zone of mylonitic deformation
      • The fault deformed viscously and rooted at depths >7 km and temperatures >700oC
      • Variation among oceanic faults is due to water content and/or thermal structure
  2. Research Articles

    1. Top of page
    2. Regular Articles
    3. Research Articles
    1. You have full text access to this OnlineOpen article
      Fluid evolution in an Oceanic Core Complex: A fluid inclusion study from IODP hole U1309 D—Atlantis Massif, 30°N, Mid-Atlantic Ridge (pages 1193–1214)

      Teddy Castelain, Andrew M. McCaig and Robert A. Cliff

      Article first published online: 23 APR 2014 | DOI: 10.1002/2013GC004975

      Key Points

      • The TAG model is a good analog for fluid evolution at Atlantis Massif
      • Fluid inclusion analyses reveal evidence for magmatic exsolution
      • Fluid inclusion analyses reveal evidence for phase separation
    2. Magnetic properties of variably serpentinized peridotites and their implication for the evolution of oceanic core complexes (pages 923–944)

      Marco Maffione, Antony Morris, Oliver Plümper and Douwe J. J. van Hinsbergen

      Article first published online: 2 APR 2014 | DOI: 10.1002/2013GC004993

      Key Points

      • Magnetic properties of variably serpentinized peridotite are investigated
      • Abyssal peridotites are unlikely to contribute to marine magnetic anomalies
      • A new conceptual model for serpentinization at OCCs is proposed
    3. Tectonic structure, lithology, and hydrothermal signature of the Rainbow massif (Mid-Atlantic Ridge 36°14’N)

      Muriel Andreani, Javier Escartin, Adélie Delacour, Benoit Ildefonse, Marguerite Godard, Jérôme Dyment, Anthony E. Fallick and Yves Fouquet

      Accepted manuscript online: 12 JUL 2014 06:30AM EST | DOI: 10.1002/2014GC005269

      Key Points

      • Rainbow massif uplifted by now inactive west dipping detachment
      • Oblique faults dissect the massif and localize hydrothermalism for last 100 kyr
      • Petrography and geochemistry unravel high and low-T fluid-rock reaction history
    1. Geological context and vents morphology of the ultramafic-hosted Ashadze hydrothermal areas (Mid-Atlantic Ridge 13°N)

      Hélène Ondréas, Mathilde Cannat, Yves Fouquet and Alain Normand

      Article first published online: 6 NOV 2012 | DOI: 10.1029/2012GC004433

      Key Points

      • The Ashadze vents are located on landslide rock mass
      • Presence of crater hydrothermal structure on ultramafic substratum
      • The crater structure results from explosions associated with geyser-like venting
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      Three-dimensional seismic structure of a Mid-Atlantic Ridge segment characterized by active detachment faulting (Trans-Atlantic Geotraverse, 25°55′N-26°20′N)

      Minghui Zhao, Juan Pablo Canales and Robert A. Sohn

      Article first published online: 2 NOV 2012 | DOI: 10.1029/2012GC004454

      Key Points

      • The 3D structural asymmetry
      • The velocity reverse anomaly leads to different TAG hydrothermal circulation
      • The active detachment faulting extending at least ~15 km
    3. The cooling history and the depth of detachment faulting at the Atlantis Massif oceanic core complex

      Nicole Schoolmeesters, Michael J. Cheadle, Barbara E. John, Peter W. Reiners, Jeffrey Gee and Craig B. Grimes

      Article first published online: 25 OCT 2012 | DOI: 10.1029/2012GC004314

      Key Points

      • Uppermost 800 m of U1309D cooled at mean rates of ~2800{degree sign}C/my
      • Lowermost 400 m of U1309D cooled at mean rates of ~500{degree sign}C/my
      • Hydrothermal convection buffered cooling of the footwall from ~250*C to 190*C
    4. Seismicity of the Atlantis Massif detachment fault, 30°N at the Mid-Atlantic Ridge

      John A. Collins, Deborah K. Smith and Jeffrey J. McGuire

      Article first published online: 9 OCT 2012 | DOI: 10.1029/2012GC004210

      Key Points

      • The oceanic core complex at the Atlantis Massif is actively deforming
      • Ridge-parallel normal faulting and transform-parallel strike-slip faulting
      • Abundant seismicity including 5 teleseisms within axial valley near transform
    5. The internal structure of an oceanic core complex: An integrated analysis of oriented borehole imagery from IODP Hole U1309D (Atlantis Massif)

      Nicola Pressling, Antony Morris, Barbara E. John and Christopher J. MacLeod

      Article first published online: 25 SEP 2012 | DOI: 10.1029/2012GC004061

      Key Points

      • Provide insights into the structural architecture of an oceanic core complex
      • Determine the depth extent of detachment-related deformation
      • Integrate unoriented core observations with fully oriented logging data
    6. Deformation associated with the denudation of mantle-derived rocks at the Mid-Atlantic Ridge 13°–15°N: The role of magmatic injections and hydrothermal alteration

      Suzanne Picazo, Mathilde Cannat, Adélie Delacour, Javier Escartín, Stéphane Rouméjon and Sergei Silantyev

      Article first published online: 14 SEP 2012 | DOI: 10.1029/2012GC004121

      Key Points

      • Gabbroic protolith for injections in ultramafic rocks
      • Types of deformation affecting ultramafic rocks
      • Localization of deformation in hydrous minerals
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      A geophysical study of oceanic core complexes and surrounding terrain, Mid-Atlantic Ridge 13°N–14°N

      C. Mallows and R. C. Searle

      Article first published online: 6 JUN 2012 | DOI: 10.1029/2012GC004075

      Key Points

      • Core complexes occur with low regional melt supply and high tectonic strain
      • Core complex footwalls are capped by low density zones of gabbro or serpentinite
      • Poorly lineated magnetic anomalies imply heterogeneous lithology or spreading
    8. You have full text access to this OnlineOpen article
      Downward continued multichannel seismic refraction analysis of Atlantis Massif oceanic core complex, 30°N, Mid-Atlantic Ridge

      A. S. Henig, D. K. Blackman, A. J. Harding, J.-P. Canales and G. M. Kent

      Article first published online: 19 MAY 2012 | DOI: 10.1029/2012GC004059

      Key Points

      • Atlantis Massif consists of laterally and vertically heterogeneous lithosphere
      • We interpret Atlantis Massif to have a dominantly gabbroic core
      • A propagating magma source and SE dipping fault cause the observed structure
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      Anatomy of an extensional shear zone in the mantle, Lanzo massif, Italy

      Mary-Alix Kaczmarek and Andréa Tommasi

      Article first published online: 10 AUG 2011 | DOI: 10.1029/2011GC003627

      Key Points

      • Extensional shear zone
      • Focusing of the deformation
      • Evolution in time and space
    10. You have full text access to this OnlineOpen article
      The 3-D geometry of detachment faulting at mid-ocean ridges

      T. J. Reston and C. R. Ranero

      Article first published online: 28 JUL 2011 | DOI: 10.1029/2011GC003666

      Key Points

      • Oceanic detachment faults are imaged on seismic
      • Oceanic detachment faults continue in the subsurface away from segment ends
      • The two types of detachment fault are related
    11. You have full text access to this OnlineOpen article
      Melt transport and deformation history in a nonvolcanic ophiolitic section, northern Apennines, Italy: Implications for crustal accretion at slow spreading settings

      Alessio Sanfilippo and Riccardo Tribuzio

      Article first published online: 28 JUL 2011 | DOI: 10.1029/2010GC003429

      Key Points

      • Compositional and structural modifications of the mantle section
      • Melt transport evolution in conjunction with exhumation
      • Similarities between studied ophiolite and modern (ultra)slow spreading ridges
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      Oceanic core complex development at the ultraslow spreading Mid-Cayman Spreading Center

      Nicholas W. Hayman, Nancy R. Grindlay, Michael R. Perfit, Paul Mann, Sylvie Leroy and Bernard Mercier de Lépinay

      Article first published online: 15 MAR 2011 | DOI: 10.1029/2010GC003240

    14. You have full text access to this OnlineOpen article
      Cooling rates and the depth of detachment faulting at oceanic core complexes: Evidence from zircon Pb/U and (U-Th)/He ages

      Craig B. Grimes, Michael J. Cheadle, Barbara E. John, Peter W. Reiners and Joseph L. Wooden

      Article first published online: 9 MAR 2011 | DOI: 10.1029/2010GC003391

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      Heterogeneous seismic velocity structure of the upper lithosphere at Kane oceanic core complex, Mid-Atlantic Ridge

      Min Xu, J. Pablo Canales, Brian E. Tucholke and David L. DuBois

      Article first published online: 10 OCT 2009 | DOI: 10.1029/2009GC002586

    17. You have full text access to this OnlineOpen article
      Cooling history of Atlantis Bank oceanic core complex: Evidence for hydrothermal activity 2.6 Ma off axis

      Joshua J. Schwartz, Barbara E. John, Michael J. Cheadle, Peter W. Reiners and A. Graham Baines

      Article first published online: 28 AUG 2009 | DOI: 10.1029/2009GC002466

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      Seismic evidence for large-scale compositional heterogeneity of oceanic core complexes

      J. Pablo Canales, Brian E. Tucholke, Min Xu, John A. Collins and David L. DuBois

      Article first published online: 6 AUG 2008 | DOI: 10.1029/2008GC002009

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