Rainer Wieler


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Wieler

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Rainer

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0000-0001-5666-7494

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Publications 1 - 10 of 36
  • The cosmogenic 21Ne production rate in quartz evaluated on a large set of existing 21Ne–10Be data
    Item type: Journal Article
    Kober, Florian; Alfimov, Vasily; Ivy-Ochs, Susan; et al. (2011)
    Earth and Planetary Science Letters
    Based on a compilation of published combined 10Be and 21Ne cosmogenic nuclide data sets from quartz samples obtained at ETH Zürich we assess the 21Ne/10Be (P21/P10) production rate ratio with the goal to determine the 21Ne production rate (P21) in quartz. A variety of sliding “erosion islands” in a 21Ne/10Be versus 10Be diagram were evaluated to find the one that fits the data best, which in turn yields the most probable P21 if the 10Be production rate is known. The approach minimizes the influence of samples with a complex exposure history. A best-fit value for P21/P10sp (sp — the 10Be fraction being produced by spallation, as opposed to production by muons) of 4.23 ± 0.17 is obtained for a 10Be half-life of 1.39 Ma. Adopting a P10sp value in quartz of 4.41 ± 0.52 at g−1 yr−1 this yields a P21 of 18.7 ± 2.3 at g−1 yr−1. It is possible that 2% of the 21Ne is produced by fast muons.
  • The Susceptibility of Phase Q to Pyridine: Are CI Chrondrite Unique?
    Item type: Other Conference Item
    Spring, Nicole H.; Busemann, Henner; Vogel, Nadia; et al. (2011)
    Meteoritics & Planetary Science
  • Investigating space-weathering on the moon using APT
    Item type: Journal Article
    Greer, Jennika; Rout, Surya; Isheim, Dieter; et al. (2021)
    Microscopy and Microanalysis
  • Volatile Element Depletion and Neutron Capture Effects in Iron Meteorites: New Constraints from Cadmium
    Item type: Other Conference Item
    Kruijer, Thomas S.; Zbinden, Marlène; Sprung, Peter; et al. (2011)
    Meteoritics & Planetary Science
  • Noble gases in cluster chondrite clasts and their host breccias
    Item type: Journal Article
    Müsing, Kim; Busemann, Henner; Huber, Liliane; et al. (2021)
    Meteoritics & Planetary Science
    We measured noble gases in “cluster chondrite clasts” from nine unequilibrated ordinary chondrites (UOCs). For five meteorites, we also present data for so-called “clastic matrix,” the impact-brecciated material in which the angular to subrounded cluster chondrite clasts are often embedded. Cluster chondrite clasts are characterized by close-fit texture of deformed and indented chondrules with lower amounts of fine-grained interchondrule matrix than in other UOCs (Metzler 2012). They are ubiquitous in UOCs and may indicate accretion and compaction of hot and deformable chondrules within hours or days after formation. Clastic matrix of four of the five meteorites contains He and Ne implanted by the solar wind (SW), indicating that they are regolith breccias. In contrast, cluster chondrite clasts are essentially devoid of SW, confirming that they are fragments of “primary accretionary rocks” (Metzler 2012). Trapped Kr and Xe in all samples are essentially primordial (type “Q”). Trapped Xe concentrations in cluster chondrite clasts are similar to values in other UOCs of similar metamorphic grade despite their low fractions of primordial gas-bearing fine-grained materials. This possibly indicates that the interchondrule matrix in cluster chondrite clasts is more pristine than matrix of regular UOCs. Later loss of primordial gases during parent body metamorphism is mirrored in the decreasing concentrations of primordial noble gases with increasing petrologic type. Relative to cluster chondrite lithologies, clastic matrix often contains excesses of cosmogenic noble gases, most likely due to precompaction exposure in the parent body regolith.
  • Mass-fractionation induced by the Genesis solar wind concentrator: Analysis of neon isotopes by UV laser ablation
    Item type: Other Conference Item
    Heber, Veronika S.; Wiens, Roger C.; Olinger, Chad; et al. (2006)
    Meteoritics & Planetary Science
  • The depth distribution of neon and argon in the bulk metallic glass flown on Genesis
    Item type: Conference Paper
    Grimberg, Ansgar; Baur, Heinrich; Burnett, Donald S.; et al. (2007)
    Lunar and planetary science XXXVIII
  • Performance of the ETH Zurich in situ C-14 extraction line
    Item type: Other Conference Item
    Hippe, Kristina; Kober, Florian; Baur, H.; et al. (2008)
    Geochimica et Cosmochimica Acta
  • Terrestrial ages, pairing, and concentration mechanism of Antarctic chondrites from Frontier Mountain, Northern Victoria Land
    Item type: Journal Article
    Welten, Kees C.; Nishiizumi, Kunihiko; Caffee, Marc W.; et al. (2006)
    Meteoritics & Planetary Science
    We report concentrations of cosmogenic 10Be, 26Al, 36Cl, and 41Ca in the metal phase of 26 ordinary chondrites from Frontier Mountain (FRO), Antarctica, as well as cosmogenic 14C in eight and noble gases in four bulk samples. Thirteen out of 14 selected H chondrites belong to two previously identified pairing groups, FRO 90001 and FRO 90174, with terrestrial ages of ˜40 and ˜100 kyr, respectively. The FRO 90174 shower is a heterogeneous H3–6 chondrite breccia that probably includes more than 300 individual fragments, explaining the high H/L chondrite ratio (3.8) at Frontier Mountain. The geographic distribution of 19 fragments of this shower constrains ice fluctuations over the past 50–100 kyr to less than ˜40 m, supporting the stability of the meteorite trap over the last glacial cycle. The second H-chondrite pairing group, FRO 90001, is much smaller and its geographic distribution is mainly controlled by wind-transport. Most L-chondrites are younger than 50 kyr, except for the FRO 93009/01172 pair, which has a terrestrial age of ˜500 kyr. These two old L chondrites represent the only surviving members of a large shower with a similar preatmospheric radius (˜80 cm) as the FRO 90174 shower. The find locations of these two paired L-chondrite fragments on opposite sides of Frontier Mountain confirm the general glaciological model in which the two ice flows passing both ends of the mountain are derived from the same source area on the plateau. The 50 FRO meteorites analyzed so far represent 21 different falls. The terrestrial ages range from 6 kyr to 500 kyr, supporting the earlier proposed concentration mechanism.
  • Primordial solar noble gases in E-chondrites; A planetary connection?
    Item type: Other Conference Item
    Busemann, Henner; Baur, Heinrich; Wieler, Rainer (2003)
    Geochimica et Cosmochimica Acta
Publications 1 - 10 of 36