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  • 1
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    Unknown
    PANGAEA
    In:  Supplement to: Gutjahr, Marcus; Vance, Derek; Hoffmann, Dirk L; Hillenbrand, Claus-Dieter; Foster, Gavin L; Rae, James W B; Kuhn, Gerhard (2013): Structural limitations in deriving accurate U-series ages from calcitic cold-water corals contrast with robust coral radiocarbon and Mg/Ca systematics. Chemical Geology, 355, 69-87, https://doi.org/10.1016/j.chemgeo.2013.07.002
    Publication Date: 2023-05-12
    Description: Radiocarbon and uranium-thorium dating results are presented from a genus of calcitic Antarctic cold-water octocorals (family Coralliidae), which were collected from the Marie Byrd Seamounts in the Amundsen Sea (Pacific sector of the Southern Ocean) and which to date have not been investigated geochemically. The geochronological results are set in context with solution and laser ablation-based element/Ca ratios (Li, B, Mg, Mn, Sr, Ba, U, Th). Octocoral radiocarbon ages on living corals are in excellent agreement with modern ambient deep-water D14C, while multiple samples of individual fossil coral specimens yielded reproducible radiocarbon ages. Provided that local radiocarbon reservoir ages can be derived for a given time, fossil Amundsen Sea octocorals should be reliably dateable by means of radiocarbon. In contrast to the encouraging radiocarbon findings, the uranium-series data are more difficult to interpret. The uranium concentration of these calcitic octocorals is an order of magnitude lower than in the aragonitic hexacorals that are conventionally used for geochronological investigations. While modern and Late Holocene octocorals yield initial d234U in good agreement with modern seawater, our results reveal preferential inward diffusion of dissolved alpha-recoiled 234U and its impact on fossil coral d234U. Besides alpha-recoil related 234U diffusion, high-resolution sampling of two fossil octocorals further demonstrates that diagenetic uranium mobility has offset apparent coral U-series ages. Combined with the preferential alpha-recoil 234U diffusion, this process has prevented fossil octocorals from preserving a closed system U-series calendar age for longer than a few thousand years. Moreover, several corals investigated contain significant initial thorium, which cannot be adequately corrected for because of an apparently variable initial 232Th/230Th. Our results demonstrate that calcitic cold-water corals are unsuitable for reliable U-series dating. Mg/Ca ratios within single octocoral specimens are internally strikingly homogeneous, and appear promising in terms of their response to ambient temperature. Magnesium/lithium ratios are significantly higher than usually observed in other deep marine calcifiers and for many of our studied corals are remarkably close to seawater compositions. Although this family of octocorals is unsuitable for glacial deep-water D14C reconstructions, our findings highlight some important differences between hexacoral (aragonitic) and octocoral (calcitic) biomineralisation. Calcitic octocorals could still be useful for trace element and some isotopic studies, such as reconstruction of ambient deep water neodymium isotope composition or pH, via boron isotopic measurements.
    Keywords: AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 2
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    PANGAEA
    In:  Supplement to: Rogerson, Mike; Dublyansky, Yuri; Hoffmann, Dirk L; Luetscher, Marc; Spötl, Christoph; Töchterle, Paul (2018): Enhanced Mediterranean water cycle explains increased humidity during MIS 3 in North Africa. Climate of the Past, 1-31, https://doi.org/10.5194/cp-2018-134
    Publication Date: 2023-01-30
    Description: Fluid inclusion isotopes for a speleothem from Libya
    Keywords: AGE; Al Akhdar massif, Cyrenaica, Libya; fluid inclusion; isotope; Original value; Sample ID; Sample mass; SC-06-01; speleothem; Speleothem, water content; Speleothem sample; SPS; Susah Cave; Volume; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 343 data points
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  • 3
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    PANGAEA
    In:  Supplement to: Hoffmann, Dirk L; Woda, Clemens; Lomitschka, Michael; Mangini, Augusto (1999): Untersuchungen zur ESR-Datierung eemzeitlicher Muscheln aus Schleswig-Holstein = ESR-dating of eemian bivalves from Schleswig-Holstein. Meyniana, 51, 113-124, https://doi.org/10.2312/meyniana.1999.51.117
    Publication Date: 2023-06-27
    Description: The ESR dating method was applied to marine shells taken from a sediment core from Dagebüll, Schleswig-Holstein. Four samples from two different depths of the core (17.5 m and 25-26 m), separated by a 2.76 meter thick clay layer (Turritella Clay), yielded identical ages within the limits of error. They indicated an assignment to the oxygen isotope stage 5, thus confirming the stratigraphic age. In addition, the ESR-ages confirm the interpretation of Lomitschka et al. (1997, doi:10.2312/meyniana.1997.49.85), that the Th/U-ages of shells below the clay layer are reliable, whereas shells located above the clay layer, which were strongly influenced by percolating groundwaters of an open system, yielded falsified Th/U-ages.
    Keywords: DA-1; DRILL; Drilling/drill rig; GIK14350-1; GIK-cruise; Hauke-Haien-Koog, Dagebüll, Schleswig-Holstein, Germany
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 4
    Publication Date: 2023-06-27
    Keywords: DA-1; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; GIK14350-1; GIK-cruise; Hauke-Haien-Koog, Dagebüll, Schleswig-Holstein, Germany; Sample ID; Thermal Ionization Mass Spectrometry (TIMS); Thorium-230; Thorium-230, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation; Uranium-238; Uranium-238, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 20 data points
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  • 5
    Publication Date: 2023-06-27
    Keywords: DA-1; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; Gamma-ray spectrometry; GIK14350-1; GIK-cruise; Hauke-Haien-Koog, Dagebüll, Schleswig-Holstein, Germany; Percentage; Standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-238; Uranium-238, standard deviation; Water content, standard deviation; Water content, wet mass
    Type: Dataset
    Format: text/tab-separated-values, 18 data points
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  • 6
    Publication Date: 2023-06-27
    Keywords: Absorbed dose, standard deviation; Absorbed dose, total ionizing dose; Age, dated; Age, maximum/old; Age, minimum/young; DA-1; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Dose rate, sediment; DRILL; Drilling/drill rig; Electron spin resonance (ESR); GIK14350-1; GIK-cruise; Hauke-Haien-Koog, Dagebüll, Schleswig-Holstein, Germany; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 32 data points
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  • 7
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    PANGAEA
    In:  Supplement to: Hoffmann, Dirk L; Woda, Clemens; Strobl, Christopher; Mangini, Augusto (2001): ESR-dating of the Arctic sediment core PS1535 dose-response and thermal behaviour of the CO-2-signal in foraminifera. Quaternary Science Reviews, 20(5-9), 1009-1014, https://doi.org/10.1016/S0277-3791(00)00059-7
    Publication Date: 2023-06-27
    Description: ESR-spectra of foraminifera in arctic sediment cores display the [CO2]- -signal (g=2.0006). Research on the thermal behaviour of the [CO2]- -signal shows that both natural and artificial irradiation generates a precursor and a thermal unstable component of the [CO2]- -signal. The precursor can be transfered to the stable radical, and unstable radicals can be removed by heating. The signal-change by heating depends on the irradiation dose. Because of the varying response on thermal treatment, the dose-response curves show systematic differences depending on the applied procedure (single- or multi-aliquot method with or without heating). A model for the description of the [CO2]- -signal-change is presented. The combination of two exponential saturation functions seems to be an adequate analytical description of the dose-response curve of the [CO2]- -signal in foraminifera. Due to the limited thermal stability this signal can be used for dating foraminifera with ages up to about 190 ka.
    Keywords: Age, dated; Age, dated standard deviation; Age, electron spin resonance (ESR); Age model, optional; Age model, stable isotope stratigraphy; ARK-IV/3; Calculated from weight/volume; DEPTH, sediment/rock; Dose rate, standard deviation; Equivalent dose; Fram Strait; GIK21535-10 PS11/430-10; KL; Method comment; Piston corer (BGR type); Polarstern; Potassium; Potassium, standard deviation; PS11; PS1535-10; Thorium-230; Thorium-230, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation; Uranium-238; Uranium-238, standard deviation; Water content, standard deviation; Water content, wet mass
    Type: Dataset
    Format: text/tab-separated-values, 162 data points
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  • 8
    Publication Date: 2023-05-12
    Keywords: Age, 14C AMS; Age, dated; Age, dated material; Age, dated standard deviation; ANT-XXIII/4; ANT-XXVI/3; AWI_Paleo; Calculated; Calendar age; Calendar age, standard deviation; Dredge; DRG; Elevation of event; Event label; Haxby Seamount (Marie Byrd Seamounts); Latitude of event; Longitude of event; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS69; PS69/318-1; PS69/319-1; PS69/320-1; PS69/321-1; PS69/325-1; PS75; PS75/247-2; PS75/250-1; PS75/251-1; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 390 data points
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  • 9
    Publication Date: 2023-05-12
    Keywords: ANT-XXIII/4; ANT-XXVI/3; AWI_Paleo; Barium/Calcium ratio; Dredge; DRG; Elevation of event; Event label; Haxby Seamount (Marie Byrd Seamounts); ICP-MS, solution; Latitude of event; Lithium/Calcium ratio; Longitude of event; Magnesium/Calcium ratio; Magnesium/Lithium ratio; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS69; PS69/318-1; PS69/320-1; PS69/321-1; PS69/325-1; PS75; PS75/247-2; Sample code/label; Strontium/Calcium ratio
    Type: Dataset
    Format: text/tab-separated-values, 114 data points
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  • 10
    Publication Date: 2023-05-12
    Keywords: Age, dated; Age, dated standard deviation; Age, difference; ANT-XXIII/4; ANT-XXVI/3; AWI_Paleo; Calendar age; Comment; Dredge; DRG; Elevation of event; Event label; Haxby Seamount (Marie Byrd Seamounts); Latitude of event; Longitude of event; Method comment; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS69; PS69/312-1; PS69/318-1; PS69/319-1; PS69/320-1; PS69/321-1; PS75; PS75/247-2; Sample code/label; Thorium-230/Uranium-238 activity ratio; Thorium-230/Uranium-238 activity ratio, standard deviation; Thorium-232; Thorium-232, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, error, relative; Uranium-234/Uranium-238 activity ratio, standard deviation; Uranium-238; Uranium-238, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 1076 data points
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