Geochemistry, Geophysics, Geosystems

Cover image for Vol. 15 Issue 7

Accepted Articles (Accepted, unedited articles published online and citable. The final edited and typeset version of record will appear in future.)

Impact Factor: 3.054

ISI Journal Citation Reports © Ranking: 2013: 15/79 (Geochemistry & Geophysics)

Online ISSN: 1525-2027

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  1. 1 - 18
  1. Research Articles

    1. Geochemical insights into the role of metasomatic hornblendite in generating alkali basalts

      Li-Qun Dai, Zi-Fu Zhao and Yong-Fei Zheng

      Accepted manuscript online: 13 SEP 2014 10:56AM EST | DOI: 10.1002/2014GC005486

      Key Points

      • Hornblendite serves as the mantle source of orogenic alkali basalt
      • Orogenic alkali basalts record recycling of subducted fossil oceanic crust
    2. The dynamics of global change at the Paleocene-Eocene thermal maximum: A data-model comparison

      Timothy J. Bralower, Katrin J. Meissner, Kaitlin Alexander and Deborah J. Thomas

      Accepted manuscript online: 13 SEP 2014 10:47AM EST | DOI: 10.1002/2014GC005474

      Key Points

      • PETM warming occurred progressively from ocean surface to deep
      • Acidification occurred in surface ocean before deep
      • Stratification increased and nutricline strengthened
    3. Estimating shallow water sound power levels and mitigation radii for the R/V Marcus G. Langseth using an 8 km long MCS streamer

      Timothy J. Crone, Maya Tolstoy and Helene Carton

      Accepted manuscript online: 10 SEP 2014 10:19AM EST | DOI: 10.1002/2014GC005420

      Key Points

      • Modeling seismic source power levels in shallow water is difficult
      • The MCS streamer can be used to estimate source power
      • Power levels can vary in response to topography and geology
    4. Early Cenozoic exhumation in the Bendeleben Mountains (Seward Peninsula, Alaska) constrained by (U-Th)/He thermochronology and thermal modeling

      Kalin T. McDannell, Jaime Toro, Jeremy K. Hourigan and Daniel Harris

      Accepted manuscript online: 9 SEP 2014 07:29PM EST | DOI: 10.1002/2014GC005424

      Key Points

      • Bendeleben apatite U-Th/He ages are ~41.3 Ma, biotite Ar/Ar ages are 81-83 Ma
      • Thermochronology and modeling show rapid late Cretaceous to Eocene exhumation
      • Seward Peninsula normal faults are part of the Hope Basin extensional system
    5. Provenance of the late quaternary sediments in the Andaman Sea: Implications for monsoon variability and ocean circulation

      Neeraj Awasthi, Jyotiranjan S. Ray, Ashutosh K. Singh, Shraddha T. Band and Vinai K. Rai

      Accepted manuscript online: 9 SEP 2014 07:24PM EST | DOI: 10.1002/2014GC005462

      Key Points

      • Temporal variation of sediment contributions to the Andaman Sea was studied
      • Indo-Burman Ranges and Andaman Islands contribute > 30% of the sediment budget
      • The Andaman Sea was well connected to the Bay of Bengal even during the LGM
    6. Sulfur isotope evolution in sulfide ores from Western Alps: Assessing the influence of subduction-related metamorphism

      Fabio Giacometti, Katy A. Evans, Gisella Rebay, John Cliff, Andrew G. Tomkins, Piergiorgio Rossetti, Gloria Vaggelli and David T. Adams

      Accepted manuscript online: 9 SEP 2014 07:20PM EST | DOI: 10.1002/2014GC005459

      Key Points

      • Fluid circulation and deformation favor the reequilibration of sulfur isotopes
      • Negligible fluid circulation and sulfur release occurred during metamorphism
      • The mobilization of metals during subduction is minimal in these study cases
    7. Three-dimensional flow in the subslab mantle

      Karen Paczkowski, Laurent G.J. Montési, Maureen D. Long and Christopher J. Thissen

      Accepted manuscript online: 9 SEP 2014 07:19PM EST | DOI: 10.1002/2014GC005441

      Key Points

      • Subducting slab acts as an obstruction to the ambient mantle background flow
      • Subslab mantle flow is sensitive to background mantle flow and slab geometry
      • Predicted flow directions generally agree with seismic anisotropy observations
    8. Tracking the exhumation of a pliocene (U)HP terrane: U-Pb and trace-element constraints from zircon, D'Entrecasteaux Islands, Papua New Guinea

      Joel W. DesOrmeau, Stacia M. Gordon, Timothy A. Little and Samuel A. Bowring

      Accepted manuscript online: 5 SEP 2014 11:34AM EST | DOI: 10.1002/2014GC005396

      Key Points

      • Zircon TIMS-TEA data constrain the exhumation of the PNG (U)HP terrane
      • Melt began to crystallize ~0.75 m.y. after (U)HP metamorphism
      • Exhumation of the terrane occurred over a ~3 Myr interval
    9. A family of repeating low-frequency earthquakes at the downdip edge of tremor and slip

      Justin R Sweet, Kenneth C Creager and Heidi Houston

      Accepted manuscript online: 2 SEP 2014 04:22AM EST | DOI: 10.1002/2014GC005449

      Key Points

      • The 9000 low-frequency earthquakes mostly locate within a circle of 300 m radius
      • LFEs cluster into swarms during which amplitudes systematically increase
      • Observed LFE moments yield only up to 20% of predicted slip
    10. Regional study of the archean to proterozoic crust at the Sudbury Neutrino Observatory (SNO+), Ontario: Predicting the geoneutrino flux

      Yu Huang, Virginia Strati, Fabio Mantovani, Steven B. Shirey and William F. McDonough

      Accepted manuscript online: 2 SEP 2014 03:28AM EST | DOI: 10.1002/2014GC005397

      Key Points

      • A 3-D regional crust around SNO+ is built
      • Geoneutrino signal from regional crust is predicted with uncertainty
      • SNO+'s sensitivity to mantle geoneutrino signal is tested
    11. A geodetic plate motion and global strain rate model

      Corné Kreemer, Geoffrey Blewitt and Elliot C. Klein

      Accepted manuscript online: 30 AUG 2014 09:03AM EST | DOI: 10.1002/2014GC005407

      Key Points

      • Approximately 22,500 horizontal geodetic velocities compiled, of which 6739 determined here
      • Geodetic plate motions for 36 plates and blocks are estimated
      • A new velocity gradient tensor field for plate boundary zones is modeled
    12. Source-related variables for the description of the oceanic carbon system

      G. Walin, J. Hieronymus and J. Nycander

      Accepted manuscript online: 27 AUG 2014 11:35AM EST | DOI: 10.1002/2014GC005383

      Key Points

      • New source-related carbon variables
      • Simple continuity equations
      • Data presented in terms of the new variables
    13. The magnitude distribution of dynamically triggered earthquakes

      Stephen Hernandez, Emily E. Brodsky and Nicholas J. van der Elst

      Accepted manuscript online: 27 AUG 2014 11:18AM EST | DOI: 10.1002/2014GC005404

      Key Points

      • The magnitudes of triggered events are indistinguishable from ambient ones
    14. Integrated geophysical-petrological modeling of lithosphere-asthenosphere boundary in central Tibet using electromagnetic and seismic data

      Jan Vozar, Alan G. Jones, Javier Fullea, Matthew R. Agius, Sergei Lebedev, Florian Le Pape and Wenbo Wei

      Accepted manuscript online: 27 AUG 2014 11:15AM EST | DOI: 10.1002/2014GC005365

      Key Points

      • Joint modeling of Tibetan MT and SW data in petrologically consistent manner
      • Lithosphere-asthenosphere boundary in central Tibet
      • Estimates of water content in Tibetan lithosphere
    15. Cenozoic epeirogeny of the Arabian Peninsula from drainage modeling

      J. W. P. Wilson, G. G. Roberts, M. J. Hoggard and N. J. White

      Accepted manuscript online: 27 AUG 2014 12:02AM EST | DOI: 10.1002/2014GC005283

      Key Points

      • Arabia's present-day topography has been generated by Neogene mantle convection
      • Longitudinal river profiles constrain the spatial and temporal uplift history
      • This uplift history is corroborated by multiple independent constraints
    16. Tectonics, topography, and river system transition in East Tibet: Insights from the sedimentary record in Taiwan

      Qing Lan, Yi Yan, Chi-Yue Huang, Peter D. Clift, Xuejie Li, Wenhuang Chen, Xingchang Zhang and Mengming Yu

      Accepted manuscript online: 26 AUG 2014 05:14AM EST | DOI: 10.1002/2014GC005310

      Key Points

      • Seafloor spreading of South China Sea propagation from east to west
      • Major change in sediment provenance in Taiwan during Late Oligocene
      • Tectonics, topography, river system transition in East Asia occurred at ~25 Ma
    17. The relationship between seismicity and fault structure on the Discovery transform fault, East Pacific Rise

      Monica Wolfson-Schwehr, Margaret S. Boettcher, Jeffrey J. McGuire and John A. Collins

      Accepted manuscript online: 21 AUG 2014 11:18AM EST | DOI: 10.1002/2014GC005445

      Key Points

      • Rupture patches and rupture barriers observed on Discovery transform fault
      • Step overs in the fault trace >1 km are not required to terminate ruptures
      • Rate of microseismicity varies between rupture patches and rupture barriers
    18. History and dynamics of net rotation of the mantle and lithosphere

      M. L. Rudolph and S.J. Zhong

      Accepted manuscript online: 18 AUG 2014 10:36PM EST | DOI: 10.1002/2014GC005457

      Key Points

      • Net rotation history can be explained for past 25 Myr.
      • Rapid past net rotation requires new dynamical origin/revised reference frame
      • Net rotation requires careful treatment in models incorporating plate motions

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