Geochemistry, Geophysics, Geosystems

    1. High resolution optically stimulated luminescence dating of a sediment core from the southwestern Sea of Okhotsk

      S. Sugisaki, J. P. Buylaert, A. S. Murray, N. Harada, K. Kimoto, Y. Okazaki, T. Sakamoto, K. Iijima, S. Tsukamoto, H. Miura and Y. Nogi

      Article first published online: 5 MAY 2012 | DOI: 10.1029/2011GC004029

      Key Points

      • Quartz fine grain OSL dating with marine sediments core
      • Testing most reliable water content model for OSL ages
      • Results show sedimentation rate difference before, during and after deglaciation
    2. Routine low-damage apatite U-Pb dating using laser ablation–multicollector–ICPMS

      Stuart N. Thomson, George E. Gehrels, Joaquin Ruiz and Robert Buchwaldt

      Article first published online: 8 FEB 2012 | DOI: 10.1029/2011GC003928

      Key Points

      • New methodology for routine laser ablation–ICPMS U-Pb dating of apatite
    3. A metrological approach to measuring 40Ar* concentrations in K-Ar and 40Ar/39Ar mineral standards

      Leah E. Morgan, Onno Postma, Klaudia F. Kuiper, Darren F. Mark, Wim van der Plas, Stuart Davidson, Michael Perkin, Igor M. Villa and Jan R. Wijbrans

      Article first published online: 7 OCT 2011 | DOI: 10.1029/2011GC003719

      Key Points

      • Sensitivity calibration of noble gas mass spectrometers
      • Mineral standard age determinations for 40Ar/39Ar geochronology
      • Metrological measurements of pressure, volume, and temperature
    4. You have full text access to this OnlineOpen article
      An algorithm for U-Pb isotope dilution data reduction and uncertainty propagation

      N. M. McLean, J. F. Bowring and S. A. Bowring

      Article first published online: 24 JUN 2011 | DOI: 10.1029/2010GC003478

      Key Points

      • We present a complete and transparent U-Pb data reduction algorithm
      • We derive and present a new and improved uncertainty propagation algorithm
      • Accuracy of the uncertainty propagation is verified by the Monte Carlo method
    5. You have full text access to this OnlineOpen article
      Engineering cyber infrastructure for U-Pb geochronology: Tripoli and U-Pb_Redux

      J. F. Bowring, N. M. McLean and S. A. Bowring

      Article first published online: 24 JUN 2011 | DOI: 10.1029/2010GC003479

      Key Points

      • We present cyber infrastructure for high-precision U-Pb geochronology for ID-TIMS
      • Tripoli processes mass spectrometer data by statistics interactive visualizations
      • U-Pb_Redux manages U-Pb data processing and visualizations
    6. Constraints on the numerical age of the Paleocene-Eocene boundary

      Adam J. Charles, Daniel J. Condon, Ian C. Harding, Heiko Pälike, John E. A. Marshall, Ying Cui, Lee Kump and Ian W. Croudace

      Article first published online: 7 JUN 2011 | DOI: 10.1029/2010GC003426

      Key Points

      • New Paleocene-Eocene boundary age range from 55.728 to 55.964 Ma (95% confidence)
      • New P-E age suggests the Cretaceous-Paleogene boundary is ∼66 Ma
      • New P-E age suggests the PETM had a different trigger from other hyperthermals
    7. (U-Th)/He dating of terrestrial impact structures: The Manicouagan example

      Matthijs C. van Soest, Kip V. Hodges, Jo-Anne Wartho, Marc B. Biren, Brian D. Monteleone, Jahandar Ramezani, John G. Spray and Lucy M. Thompson

      Article first published online: 26 MAY 2011 | DOI: 10.1029/2010GC003465

      Key Points

      • Zircon (U-Th)/He accurately dates Manicouagan impact crater at 213.2 +/− 5.4 Ma
      • Titanite (U-Th)/He dates from shocked central uplift sample confirm zircon age
      • Apatite (U-Th)/He records minor postimpact thermal overprinting at Manicouagan
    8. Better mathematical constraints on ages of Carboniferous stage boundaries using radiometric tuff dates and cyclostratigraphy

      John A. Peterson

      Article first published online: 3 MAY 2011 | DOI: 10.1029/2010GC003467

      Key Points

      • A more robust mathematical method for cyclic stratigraphy
      • Cyclostratigraphy and radiometric dates are combined
      • Uncertainties in the stage boundaries are reduced to less than 1 Ma
    9. In situ location and U-Pb dating of small zircon grains in igneous rocks using laser ablation–inductively coupled plasma–quadrupole mass spectrometry

      Patrick J. Sack, Ron F. Berry, Sebastien Meffre, Trevor J. Falloon, J. Bruce Gemmell and Richard M. Friedman

      Article first published online: 5 APR 2011 | DOI: 10.1029/2010GC003405

      Key Points

      • Small zircons can routinely be found using automated SEM-based technique
      • Small zircons can be dated in situ with 6% uncertainty using 10 micrometer spot
      • High U content in small zircon grains is problematic but is not universal
    10. CH4-CO2 replacement in hydrate-bearing sediments: A pore-scale study

      J. W. Jung and J. Carlos Santamarina

      Article first published online: 11 DEC 2010 | DOI: 10.1029/2010GC003339

    11. Reconciling astrochronological and 40Ar/39Ar ages for the Matuyama-Brunhes boundary and late Matuyama Chron

      J. E. T. Channell, D. A. Hodell, B. S. Singer and C. Xuan

      Article first published online: 7 DEC 2010 | DOI: 10.1029/2010GC003203

    12. A geologically constrained Monte Carlo approach to modeling exposure ages from profiles of cosmogenic nuclides: An example from Lees Ferry, Arizona

      Alan J. Hidy, John C. Gosse, Joel L. Pederson, Jann Paul Mattern and Robert C. Finkel

      Article first published online: 2 SEP 2010 | DOI: 10.1029/2010GC003084

    13. Mass discrimination monitoring and intercalibration of dual collectors in noble gas mass spectrometer systems

      Brent D. Turrin, Carl C. Swisher III and Alan L. Deino

      Article first published online: 20 AUG 2010 | DOI: 10.1029/2009GC003013

    14. High-resolution rock magnetic cyclostratigraphy in an Eocene flysch, Spanish Pyrenees

      K. P. Kodama, D. J. Anastasio, M. L. Newton, J. M. Pares and L. A. Hinnov

      Article first published online: 11 JUN 2010 | DOI: 10.1029/2010GC003069

    15. Improved laser ablation U-Pb zircon geochronology through robust downhole fractionation correction

      Chad Paton, Jon D. Woodhead, John C. Hellstrom, Janet M. Hergt, Alan Greig and Roland Maas

      Article first published online: 26 MAR 2010 | DOI: 10.1029/2009GC002618

    16. Ratio of 36Cl/Cl in ground ice of east Siberia and its application for chronometry

      A. Blinov, V. Alfimov, J. Beer, D. Gilichinsky, L. Schirrmeister, A. Kholodov, P. Nikolskiy, T. Opel, D. Tikhomirov and S. Wetterich

      Article first published online: 11 NOV 2009 | DOI: 10.1029/2009GC002548

    17. Improved confidence in (U-Th)/He thermochronology using the laser microprobe: An example from a Pleistocene leucogranite, Nanga Parbat, Pakistan

      J. W. Boyce, K. V. Hodges, D. King, J. L. Crowley, M. Jercinovic, N. Chatterjee, S. A. Bowring and M. Searle

      Article first published online: 16 SEP 2009 | DOI: 10.1029/2009GC002497