Journal: Quaternary Geochronology

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Elsevier

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1871-1014

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Publications1 - 10 of 35
  • Chronology of Lateglacial ice flow reorganization and deglaciation in the Gotthard Pass area, Central Swiss Alps, based on cosmogenic 10Be and in situ 14C
    Item type: Journal Article
    Hippe, Kristina; Ivy-Ochs, Susan; Kober, Florian; et al. (2014)
    Quaternary Geochronology
  • Evaluation of cosmogenic 3He and 21Ne production rates in olivine and pyroxene from two Pleistocene basalt flows, western Grand Canyon, AZ, USA
    Item type: Journal Article
    Fenton, Cassandra R.; Niedermann, Samuel; Geothals, Mirjam M.; et al. (2009)
    Quaternary Geochronology
  • Depth-dependence of the production rate of in situ14C in quartz from the Leymon High core, Spain
    Item type: Journal Article
    Lupker, M.; Hippe, K.; Wacker, L.; et al. (2015)
    Quaternary Geochronology
  • OSL-thermochronometry using bedrock quartz
    Item type: Journal Article
    Guralnik, Benny; Ankjærgaard, Christina; Jain, Mayank; et al. (2015)
    Quaternary Geochronology
  • Permafrost-related hiatuses in stalagmites: Evaluating the potential for reconstruction of carbon cycle dynamics
    Item type: Journal Article
    Lechleitner, Franziska A.; Mason, Andrew J.; Breitenbach, Sebastian F. M.; et al. (2020)
    Quaternary Geochronology
  • The current performance of the in situ 14C extraction line at ETH
    Item type: Journal Article
    Hippe, Kristina; Kober, Florian; Baur, Heinrich; et al. (2009)
    Quaternary Geochronology
  • Interlaboratory comparison of cosmogenic 21Ne in quartz
    Item type: Journal Article
    Vermeesch, Pieter; Balco, Greg; Blard, Pierre-Henri; et al. (2015)
    Quaternary Geochronology
    We performed an interlaboratory comparison study with the aim to determine the accuracy of cosmogenic 21Ne measurements in quartz. CREU-1 is a natural quartz standard prepared from amalgamated vein clasts which were crushed, thoroughly mixed, and sieved into 125–250 μm and 250–500 μm size fractions. 50 aliquots of CREU-1 were analyzed by five laboratories employing six different noble gas mass spectrometers. The released gas contained a mixture of 16–30% atmospheric and 70–84% non-atmospheric (predominantly cosmogenic) 21Ne, defining a linear array on the 22Ne/20Ne-21Ne/20Ne three isotope diagram with a slope of 1.108 ± 0.014. The internal reproducibility of the measurements is in good agreement with the formal analytical precision for all participating labs. The external reproducibility of the 21Ne concentrations between labs, however, is significantly overdispersed with respect to the reported analytical precision. We report an average reference concentration for CREU-1 of 348 ± 10 × 106 at [21Ne]/g[SiO2], and suggest that the 7.1% (2σ) overdispersion of our measurements may be representative of the current accuracy of cosmogenic 21Ne in quartz. CREU-1 was tied to CRONUS-A, which is a second reference material prepared from a sample of Antarctic sandstone. We propose a reference value of 320 ± 11 × 106 at/g for CRONUS-A. The CREU-1 and CRONUS-A intercalibration materials may be used to improve the consistency of cosmogenic 21Ne to the level of the analytical precision.
  • High-precision 40Ar/39Ar dating of pleistocene tuffs and temporal anchoring of the Matuyama-Brunhes boundary
    Item type: Journal Article
    Mark, Darren F.; Renne, Paul R.; Dymock, Ross C.; et al. (2017)
    Quaternary Geochronology
    High-precision 40Ar/39Ar ages for a series of proximal tuffs from the Toba super-volcano in Indonesia, and the Bishop Tuff and Lava Creek Tuff B in North America have been obtained. Core from Ocean Drilling Project Site 758 in the eastern equatorial Indian Ocean contains discrete tephra layers that we have geochemically correlated to the Young Toba Tuff (73.7 ± 0.3 ka), Middle Toba Tuff (502 ± 0.7 ka) and two eruptions (OTTA and OTTB) related to the Old Toba Tuff (792.4 ± 0.5 and 785.6 ± 0.7 ka, respectively) (40Ar/39Ar data reported as full external precision, 1 sigma). Within ODP 758 Termination IX is coincident with OTTB and hence this age tightly constrains the transition from Marine Isotope Stage 19–20 for the Indian Ocean. The core also preserves the location of the Australasian tektites, and the Matuyama-Brunhes boundary with Bayesian age-depth models used to determine the ages of these events, c. 786 and c. 784 ka, respectively. In North America, the Bishop Tuff (766.6 ± 0.4 ka) and Lava Creek Tuff B (627.0 ± 1.5 ka) have quantifiable stratigraphic relationships to the Matuyama-Brunhes boundary. Linear age-depth extrapolation, allowing for uncertainties associated with potential hiatuses in five different terrestrial sections, defines a geomagnetic reversal age of 789 ± 6 ka. Considering our data with respect to the previously published age data for the Matuyama-Brunhes boundary of Sagnotti et al. (2014), we suggest at the level of temporal resolution currently attainable using radioisotopic dating the last reversal of Earths geomagnetic field was isochronous. An overall Matuyama-Brunhes reversal age of 783.4 ± 0.6 ka is calculated, which allowing for inherent uncertainties in the astronomical dating approach, is indistinguishable from the LR04 stack age (780 ± 5 ka) for the geomagnetic boundary. Our high-precision age is 10 ± 2 ka older than the Matuyama-Brunhes boundary age of 773 ± 1 ka, as reported previously by Channell et al. (2010) for Atlantic Ocean records. As ODP 758 features in the LR04 marine stack, the high-precision 40Ar/39Ar ages determined here, as well as the Matuyama-Brunhes boundary age, can be used as temporally accurate and precise anchors for the Pleistocene time scale.
  • Cosmogenic isotope burial dating of fluvial sediments from the Lower Rhine Embayment, Germany
    Item type: Journal Article
    Dehnert, Andreas; Kracht, Oliver; Preusser, Frank; et al. (2011)
    Quaternary Geochronology
  • Tracking the pace of Quaternary landscape change with cosmogenic nuclides
    Item type: Other Journal Item
    Ivy-Ochs, Susan; Akçar, Naki; Jull, A.J. Timothy (2014)
    Quaternary Geochronology
Publications1 - 10 of 35