Geochemistry, Geophysics, Geosystems

Cover image for Geochemistry, Geophysics, Geosystems

April 2012

Volume 13, Issue 4

    1. Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion

      F. Wobbe, K. Gohl, A. Chambord and R. Sutherland

      Article first published online: 1 MAY 2012 | DOI: 10.1029/2011GC003742

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      Key Points

      • High-resolution aeromagnetic data acquired in a previously unsurveyed area
      • Models of continental margin crust constrained by seismic and gravity data
      • Plate-tectonic reconstruction considering continental deformation during breakup
    2. Thermomechanical model reconciles contradictory geophysical observations at the Dead Sea Basin

      Alexey G. Petrunin, Ernesto Meneses Rioseco, Stephan V. Sobolev and Michael Weber

      Article first published online: 28 APR 2012 | DOI: 10.1029/2011GC003929

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      Key Points

      • Contradictory data for the Dead Sea Basin are reconciled by 3D numerical model
      • Lithospheric erosion at about 20Ma can explain observational data for the DSB
      • The Dead Sea is a classical pull-apart (not a rift or a “drop down” basin)
    3. Morphology of the Faial Island shelf (Azores): The interplay between volcanic, erosional, depositional, tectonic and mass-wasting processes

      R. Quartau, F. Tempera, N. C. Mitchell, L. M. Pinheiro, H. Duarte, P. O. Brito, C. R. Bates and J. H. Monteiro

      Article first published online: 28 APR 2012 | DOI: 10.1029/2011GC003987

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      Key Points

      • Assessing the role of different processes on the development of Faial Island shelf
      • Wave erosion and volcanism are the main processes shaping its morphology
      • A conceptual model of the development of volcanic insular shelves is proposed
    4. Temporal and spatial evolution of dynamic support from river profiles: A framework for Madagascar

      Gareth G. Roberts, Jonathan D. Paul, Nicky White and Jeffrey Winterbourne

      Article first published online: 24 APR 2012 | DOI: 10.1029/2012GC004040

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      Key Points

      • A history of uplift can be estimated from the shapes of river profiles
      • Madagascar has been uplifted by 1-2 km during the last 15 Ma
      • Our calculated history of uplift is consistent with emergent dynamic support
    5. You have full text access to this OnlineOpen article
      Cenozoic tectono-thermal history of the Tordrillo Mountains, Alaska: Paleocene-Eocene ridge subduction, decreasing relief, and late Neogene faulting

      Jeff A. Benowitz, Peter J. Haeussler, Paul W. Layer, Paul B. O'Sullivan, Wes K. Wallace and Robert J. Gillis

      Article first published online: 21 APR 2012 | DOI: 10.1029/2011GC003951

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      Key Points

      • Southern Alaska experienced a region-wide thermal event during the Paleo-Eocene
      • Exhumation occurred in the Tordrillo Mountains driven by the thermal event
      • Ridge subduction and a resultant slab window led to the thermal event
    6. Structure, temporal evolution, and heat flux estimates from the Lucky Strike deep-sea hydrothermal field derived from seafloor image mosaics

      Thibaut Barreyre, Javier Escartín, Rafael Garcia, Mathilde Cannat, Eric Mittelstaedt and Ricard Prados

      Article first published online: 19 APR 2012 | DOI: 10.1029/2011GC003990

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      Key Points

      • A temporal decline of hydrothermalism demonstrated by repeated image mosaics
      • Outflow structure shows clustering that we relate to plumbing geometry
      • Heat flux estimate at Lucky Strke (200-1000 MW) and partition to diffuse flow >75%
    7. Quantifying diffuse and discrete venting at the Tour Eiffel vent site, Lucky Strike hydrothermal field

      Eric Mittelstaedt, Javier Escartín, Nuno Gracias, Jean-Arthur Olive, Thibaut Barreyre, Anne Davaille, Mathilde Cannat and Rafael Garcia

      Article first published online: 19 APR 2012 | DOI: 10.1029/2011GC003991

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      Key Points

      • Diffuse venting carries ~95% of the heat flux from the Tour Eiffel vent site
      • Large differences in diffuse flow style exist between Tour Eiffel and Y3 vents
      • Magmatic and tectonic processes may control diffuse and discrete heat fluxes
    8. Slow slip events in Costa Rica detected by continuous GPS observations, 2002–2011

      Yan Jiang, Shimon Wdowinski, Timothy H. Dixon, Matthias Hackl, Marino Protti and Victor Gonzalez

      Article first published online: 18 APR 2012 | DOI: 10.1029/2012GC004058

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      Key Points

      • The Nicoya CGPS network is capable of capturing slow slip events in this area
      • Slow slip events occur in this region every 21 months
      • Slip areas are segmented in the Nicoya Peninsula
    9. Paleoseismology of the North Anatolian Fault at Güzelköy (Ganos segment, Turkey): Size and recurrence time of earthquake ruptures west of the Sea of Marmara

      Mustapha Meghraoui, M. Ersen Aksoy, H. Serdar Akyüz, Matthieu Ferry, Aynur Dikbaş and Erhan Altunel

      Article first published online: 12 APR 2012 | DOI: 10.1029/2011GC003960

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      Key Points

      • Paleoseismic study along the North Anatolian Fault
      • Slip rate and recurrence interval of large earthquakes
      • Contribute in constraining the expected large earthquake in the Marmara Sea
    10. Influence of diagenesis on the stable isotopic composition of biogenic carbonates from the Gulf of Tehuantepec oxygen minimum zone

      C. L. Blanchet, S. Kasten, L. Vidal, S. W. Poulton, R. Ganeshram and N. Thouveny

      Article first published online: 11 APR 2012 | DOI: 10.1029/2011GC003800

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      Key Points

      • Large excursions in the foraminiferal isotope record
      • Widespread inorganic calcite and gypsum precipitation during early diagenesis
      • Gypsum formation probably related to sufide oxidation and disproportionation
    11. Characterizing the microstructure of Arctica islandica shells using NanoSIMS and EBSD

      Graeme B. Karney, Paul G. Butler, Susannah Speller, James D. Scourse, Christopher A. Richardson, Markus Schröder, Gareth M. Hughes, Jan T. Czernuszka and Chris R. M. Grovenor

      Article first published online: 7 APR 2012 | DOI: 10.1029/2011GC003961

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      Key Points

      • The two annual increments in A. islandica shell are compositionally distinct
      • Orientation of the aragonite c-axis is the same in both annual increments
      • The aragonite a- and b- axes are oriented at three preferred angles
    12. Insights on the kinematics of the India-Eurasia collision from global geodynamic models

      Sabin Zahirovic, R. Dietmar Müller, Maria Seton, Nicolas Flament, Michael Gurnis and Joanne Whittaker

      Article first published online: 4 APR 2012 | DOI: 10.1029/2011GC003883

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      Key Points

      • Testing India-Eurasia collision kinematics using geodynamic models
      • Results indicate Greater India collided first with NeoTethyan back-arc basin
      • Long-lived Andean style subduction does not explain present-day mantle structure
    13. The role of slabs and oceanic plate geometry in the net rotation of the lithosphere, trench motions, and slab return flow

      M. Gérault, T. W. Becker, B. J. P. Kaus, C. Faccenna, L. Moresi and L. Husson

      Article first published online: 4 APR 2012 | DOI: 10.1029/2011GC003934

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      Key Points

      • Slab dip angle and viscosity exert major controls on net rotation
      • Asymmetric plate geometry largely promotes net rotation
      • Fast net rotations may be transient and accommodated by plate size evolution

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