Anzeige der Dokumente 538-557 von 562

    • Variability in the Concentration of Lithium in the Indo‐Pacific Ocean 

      Steiner, ZviORCIDiD; Landing, William M.ORCIDiD; Bohlin, Madeleine S.ORCIDiD; Greaves, MervynORCIDiD; Prakash, Satya; Vinayachandran, P. N.ORCIDiD; Achterberg, Eric P.ORCIDiD (Global Biogeochemical Cycles, 2022-06-22)
      Lithium has limited biological activity and can readily replace aluminium, magnesium and iron ions in aluminosilicates, making it a proxy for the inorganic silicate cycle and its potential link to the carbon cycle. Data ...
    • Variscan ultra‐high‐pressure eclogite in the Upper Allochthon of the Rhodope Metamorphic Complex (Bulgaria) 

      Trapp, SvenjaORCIDiD; Janák, Marian; Fassmer, Kathrin; Froitzheim, Nikolaus; Münker, CarstenORCIDiD; Georgiev, Neven (Terra Nova, 2020-11-10)
      The Rhodope Metamorphic Complex (RMC) in Bulgaria has been established as a Mesozoic ultra‐high‐pressure metamorphic province by findings of microdiamond in gneisses. Additionally, Variscan ultra‐high‐pressure metamorphism ...
    • Verhüttungsexperimente mit Chalkopyrit-Erz nach Vorbildern aus dem bronzezeitlichen Ostalpenraum und Nepal 

      Rose, ThomasORCIDiD; Hanning, EricaORCIDiD; Klein, Sabine (Experimentelle Archäologie in Europa, 2019)
      Smelting experiments with chalcopyrite ore based on records of the Bronze Age Eastern Alps and Nepal. During the summer of 2018, the German Mining Museum Bochum (DBM) and the Roman-Germanic Central Museum (RGZM) conducted ...
    • Vesicle shrinkage in hydrous phonolitic melt during cooling 

      Allabar, A.ORCIDiD; Dobson, K. J.; Bauer, C. C.; Nowak, M. (Contributions to Mineralogy and Petrology, 2020-02-12)
      The ascent of hydrous magma prior to volcanic eruptions is largely driven by the formation of H2O vesicles and their subsequent growth upon further decompression. Porosity controls buoyancy as well as vesicle coalescence ...
    • Viscosity of evolving magmas: a case study of the Glass House Mountains, Australia 

      Webb, Sharon L.ORCIDiD (Bulletin of Volcanology, 2021-10-28)
      The viscosity of the remelted rock compositions of the Glass House Mountains, SE Queensland, Australia, has been determined via micro-penetration in the high-viscosity regime (108–1013 Pa s). The heat capacity of these ...
    • Visualization of texture components using MTEX 

      Rafailov, Gennady; Caspi, El'ad N.; Hielscher, Ralf; Tiferet, Eitan; Schneck, Roni; Vogel, Sven C. (Journal of Applied Crystallography, 2020)
      Knowledge of the appearance of texture components and fibres in pole figures, in inverse pole figures and in Euler space is fundamental for texture analysis. For cubic crystal systems, such as steels, an extensive literature ...
    • Vorkommen von Vanadium im Grundwasser der Vulkaneifel 

      Härter, Linda M.; Kersten, MichaelORCIDiD; Riße, Andreas; Poppe, Rudolf; Wieber, Georg (Grundwasser, 2020-03-18)
      In Quellwasserproben rund um den Ringseitert-Vulkankomplex südöstlich der Gemeinde Kirchweiler (Westeifel) wurden weit über dem Geringfügigkeitsschwellenwert erhöhte Vanadiumkonzentrationen mit einem Maximalwert von 28 μg/l ...
    • Vortex-Wide Detection of Large Aspherical NAT Particles in the Arctic Winter 2011/12 Stratosphere 

      Woiwode, W.ORCIDiD; Höpfner, M.ORCIDiD; Bi, L.ORCIDiD; Khosrawi, F.; Santee, M. L.ORCIDiD (Geophysical Research Letters, 2019)
      Micron-sized HNO3-containing particles in polar stratospheric clouds are known to denitrify the polar winter stratosphere and support chemical ozone loss. We show that populations of nitric acid trihydrate (NAT) particles ...
    • Water Content of the Dehydration Melting Layer in the Topmost Lower Mantle 

      Fei, HongzhanORCIDiD (Geophysical Research Letters, 2021-01-09)
      The water‐rich mantle transition zone and dry lower mantle suggest that a dehydration melting layer can form at the 660‐km depth boundary. However, the water content of the melting layer (CH2Omelt), which dominates its ...
    • Water contents of nominally anhydrous orthopyroxenes from oceanic peridotites determined by SIMS and FTIR 

      Wenzel, Kirsten T.ORCIDiD; Wiedenbeck, Michael; Gose, Jürgen; Rocholl, Alexander; Schmädicke, EstherORCIDiD (Mineralogy and Petrology, 2021-08-27)
      This study presents new secondary ion mass spectrometry (SIMS) reference materials (RMs) for measuring water contents in nominally anhydrous orthopyroxenes from upper mantle peridotites. The enstatitic reference orthopyroxenes ...
    • Water in garnet of garnetite (metarodingite) and eclogite from the Erzgebirge and the Lepontine Alps 

      Schmädicke, EstherORCIDiD; Gose, Jürgen (Journal of Metamorphic Geology, 2020)
      Little is known about water in nominally anhydrous minerals of orogenic garnet peridotite and enclosed metabasic rocks. This study is focused on peridotite-hosted eclogite and garnetite (metarodingite) from the Erzgebirge ...
    • Water Isotopic Signature of Surface Snow Metamorphism in Antarctica 

      Casado, MathieuORCIDiD; Landais, AmaelleORCIDiD; Picard, GhislainORCIDiD; Arnaud, LaurentORCIDiD; Dreossi, Giuliano; Stenni, BarbaraORCIDiD; Prié, Frederic (Geophysical Research Letters, 2021-09-03)
      Water isotope ratios of ice cores are a key source of information on past temperatures. Through fractionation within the hydrological cycle, temperature is imprinted in the water isotopic composition of snowfalls. However, ...
    • Water Solubility in Fe‐Bearing Wadsleyite at Mantle Transition Zone Temperatures 

      Fei, HongzhanORCIDiD; Katsura, TomooORCIDiD (Geophysical Research Letters, 2021-05-03)
      Wadsleyite can store significant amounts of H2O in its crystal structure as hydroxyl. However, H2O solubility in Fe‐bearing wadsleyite remains poorly constrained at mantle transition zone temperatures. Previous studies ...
    • Western Mediterranean Climate Response to Dansgaard/Oeschger Events: New Insights From Speleothem Records 

      Budsky, AlexanderORCIDiD; Wassenburg, Jasper A.; Mertz-Kraus, ReginaORCIDiD; Spötl, ChristophORCIDiD; Jochum, Klaus PeterORCIDiD; Gibert, Luis; Scholz, DenisORCIDiD (Geophysical Research Letters, 2019)
      The climate of the western Mediterranean was characterized by a strong precipitation gradient during the Holocene driven by atmospheric circulation patterns. The scarcity of terrestrial paleoclimate archives has precluded ...
    • What Can We Learn From X-Ray Fluorescence Core Scanning Data? A Paleomonsoon Case Study 

      Gebregiorgis, D.; Giosan, L.; Hathorne, E. C.; Anand, P.; Nilsson-Kerr, K.; Plass, A.; Lückge, A.; Clemens, S. C.; Frank, M. (Geochemistry, Geophysics, Geosystems, 2020)
      X-ray fluorescence (XRF) core scanning of marine and lake sediments has been extensively used to study changes in past environmental and climatic processes over a range of timescales. The interpretation of XRF-derived ...
    • Why productive lakes are larger mercury sedimentary sinks than oligotrophic brown water lakes 

      Schütze, MartinORCIDiD; Gatz, Philipp; Gilfedder, Benjamin‐Silas; Biester, HaraldORCIDiD (Limnology and Oceanography, 2020-12-25)
      Mercury accumulation in lake sediments is a widespread environmental problem due to the biomagnification of Hg in the aquatic food chain. Soil Hg concentrations, catchment vegetation, erosion, and lake productivity are ...
    • X-ray diffraction from strongly bent crystals and spectroscopy of X-ray free-electron laser pulses 

      Kaganer, Vladimir M.; Petrov, Ilia; Samoylova, Liubov (Acta Crystallographica Section A, 2019)
      The use of strongly bent crystals in spectrometers for pulses of a hard X-ray free-electron laser is explored theoretically. Diffraction is calculated in both dynamical and kinematical theories. It is shown that diffraction ...
    • X-ray diffraction using focused-ion-beam-prepared single crystals 

      Weigel, Tina; Funke, Claudia; Zschornak, Matthias; Behm, Thomas; Stöcker, Hartmut; Leisegang, Tilmann; Meyer, Dirk C. (Journal of Applied Crystallography, 2020)
      High-quality single-crystal X-ray diffraction measurements are a prerequisite for obtaining precise and reliable structure data and electron densities. The single crystal should therefore fulfill several conditions, of ...
    • XDSGUI: a graphical user interface for XDS, SHELX and ARCIMBOLDO 

      Brehm, Wolfgang; Triviño, Josep; Krahn, Juno M.; Usón, Isabel; Diederichs, Kay (Journal of Applied Crystallography, 2023-09-05)

      XDSGUI is a lightweight graphical user interface (GUI) for the XDS, SHELX and ARCIMBOLDO ...

    • XGANDALF – extended gradient descent algorithm for lattice finding 

      Gevorkov, Yaroslav; Yefanov, Oleksandr; Barty, Anton; White, Thomas A.; Mariani, Valerio; Brehm, Wolfgang; Tolstikova, Aleksandra; Grigat, Rolf-Rainer; Chapman, Henry N. (Acta Crystallographica Section A, 2019-08-30)
      Serial crystallography records still diffraction patterns from single, randomly oriented crystals, then merges data from hundreds or thousands of them to form a complete data set. To process the data, the diffraction ...