Browsing by Author "Ratschbacher, Lothar"

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  • ItemOpen Access
    Digital Supplement Michael Hohf, Dissertation (Tourmaline chemistry & Geochronology Río Blanco-Los Bronces, Chile)
    (Technische Universität Bergakademie Freiberg, 2021-05-29) Ratschbacher, Lothar
    13 datafiles, Supplement zur Dissertation Michael Hohf (Rohdaten der U-Pb und Ar/Ar Geochronologie; Mineralchemie der Tourmalinanalysen, Bor- und Schwefel-Isotopen-Daten; Karten)
  • ItemOpen Access
    Supporting Information to Abdulhameed et al., "Tajik Basin and Southwestern Tian Shan, Northwestern India-Asia Collision Zone: 2. Timing of Basin Inversion, Tian Shan Mountain Building, and Relation to Pamir-Plateau Advance and Deep India-Asia Indentation", 2020, Tectonics
    (Technische Universität Bergakademie Freiberg, 2020-01-19) Ratschbacher, Lothar
    Supporting information Text S1 Tables S1 to S3 Figure S1 to Figure S4 Dataset S1 with Tables S4 to Table S6
  • ItemOpen Access
    Supporting Information to Dedow et al., AGU, Tectonics, vol. 39, 2020
    (Technische Universität Bergakademie Freiberg, 2020-01-19) Ratschbacher, Lothar
    Supporting information Text S1 gives references to the Soviet-time geological maps referenced in the publication. Tables S1 and S2 provide geochemical data sets and the statistical evaluation
  • ItemOpen Access
    Supporting information to Gagala et al., Tectonics, 38, 2020 (AGU publication) (Tajik-basin structure)
    (Technische Universität Bergakademie Freiberg, 2020-01-19) Ratschbacher, Lothar
    Text S1 provides the references to the Soviet-time geological maps of the USSR at a scale of 1:200,000. Figures provide supporting Figures that are mentioned in the main body of the publication text. Contents of this File: Supporting information S1; Figures S1 to S9
  • ItemOpen Access
    Supporting Information to Härtel et al. "Multi-band Raman analysis of radiation damage in zircon for thermochronology: Partial annealing and mixed signals" (2022), Geochemistry, Geophysics, Geosystems
    (Technische Universität Bergakademie Freiberg, 2021-12-21) Härtel, Birk; Ratschbacher, Lothar; Jonckheere, Raymond
    Four zircon Raman bands were previously calibrated to give consistent estimates of the accumulated self-irradiation α-dose in unannealed volcanic samples. Partial annealing of radiation damage produces inconsistent values because the relative annealing sensitivities of the different bands differ from their relative accumulation rates. The damage estimate based on the external rotation band (DER) is the most sensitive and that based on the internal bending mode, ν2(SiO4) (D2), is the least sensitive to annealing. The D2/DER-ratio thus provides an estimate of the extent of annealing that a zircon sample has experienced. Further, it characterizes its Raman age and thermal history but also its state of radiation damage during its geologic history—and therefore—the manner in which this state influences other thermochronologic methods. Meaningful interpretation of the thermal signal and of the zircon Raman age requires that the spectra are free of measurement artifacts. The major artifacts result from micrometer-scale gradients of the damage densities within a zircon grain due to uranium and thorium zoning. The sampled volume may span different densities, producing overlapping spectra, causing apparent peak broadening, overestimated damage densities, and zircon Raman ages. The D3/D2-ratio calculated from the ν3(SiO4) and ν2(SiO4) bands, most and least affected by the overlap, is an efficient indicator of a meaningless signal. It reveals overlap in annealed and unannealed samples, because the ν2(SiO4) and ν3(SiO4) bands have similar responses to annealing. Multi-band Raman maps can be converted to damage-ratio maps for screening zircon mounts and for selecting suitable spots for thermochronologic investigations.