Anzeige der Dokumente 550-567 von 567

    • 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 ...
    • X‐ray dichroism in polyimide caused by non‐resonant scattering 

      Schulze, K. S.; Loetzsch, R.; Rüffer, R.; Uschmann, I.; Röhlsberger, R.; Paulus, G. G. (Journal of Synchrotron Radiation, 2020-12-22)
      Dichroism is one of the most important optical effects in both the visible and the X‐ray range. Besides absorption, scattering can also contribute to dichroism. This paper demonstrates that, based on the example of polyimide, ...
    • X‐ray diffraction with micrometre spatial resolution for highly absorbing samples 

      Chakrabarti, Prerana; Wildeis, Anna; Hartmann, Markus; Brandt, Robert; Döhrmann, Ralph; Fevola, Giovanni; Ossig, Christina; Stuckelberger, Michael Elias; Garrevoet, Jan; Falch, Ken Vidar; Galbierz, Vanessa; Falkenberg, Gerald; Modregger, Peter (Journal of Synchrotron Radiation, 2022-10-05)
      X‐ray diffraction with high spatial resolution is commonly used to characterize (poly)crystalline samples with, for example, respect to local strain, residual stress, grain boundaries and texture. However, the investigation ...
    • X‐SPEC: a 70 eV to 15 keV undulator beamline for X‐ray and electron spectroscopies 

      Weinhardt, Lothar; Steininger, Ralph; Kreikemeyer-Lorenzo, Dagmar; Mangold, Stefan; Hauschild, Dirk; Batchelor, David; Spangenberg, Thomas; Heske, Clemens (Journal of Synchrotron Radiation, 2021-02-10)
      X‐SPEC is a high‐flux spectroscopy beamline at the KIT (Karlsruhe Institute of Technology) Synchrotron for electron and X‐ray spectroscopy featuring a wide photon energy range. The beamline is equipped with a permanent ...
    • Young magmatism and Si‐rich melts on Mars as documented in the enriched gabbroic shergottite NWA 6963 

      Lindner, MilesORCIDiD; Hezel, Dominik C.ORCIDiD; Gerdes, AxelORCIDiD; Marschall, Horst R.ORCIDiD; Brenker, Frank E.ORCIDiD (Meteoritics & Planetary Science, 2022-10-17)
      Enriched shergottites contain interstitial Si‐rich mesostasis; however, it is unclear whether such mesostasis is formed by impact or magmatic processes. We use laser ablation multicollector inductively coupled plasma mass ...
    • Zircon and Melt Extraction From a Long‐Lived and Vertically Extensive Magma System Underneath Ilopango Caldera (El Salvador) 

      Cisneros de León, A.ORCIDiD; Schmitt, A. K.ORCIDiD; Kutterolf, S.ORCIDiD; Schindlbeck‐Belo, J. C.; Hernández, W.; Sims, K. W. W.; Garrison, J.ORCIDiD; Kant, L. B.ORCIDiD; Weber, B.ORCIDiD; Wang, K.‐L.ORCIDiD; Lee, H.‐Y.; Trumbull, R. B. (Geochemistry, Geophysics, Geosystems, 2021-05-12)
      The Tierra Blanca (TB) eruptive suite comprises the last four major eruptions of Ilopango caldera in El Salvador (≤45 ka), including the youngest Tierra Blanca Joven eruption (TBJ; ∼106 km3): the most voluminous event ...
    • Zircon Dates Long‐Lived Plume Dynamics in Oceanic Islands 

      Rojas‐Agramonte, YamirkaORCIDiD; Kaus, Boris J. P.ORCIDiD; Piccolo, AndreaORCIDiD; Williams, Ian S.ORCIDiD; Gerdes, AxelORCIDiD; Wong, Jean; Xie, HangXianORCIDiD; Buhre, Stephan; Toulkeridis, Theofilos; Montero, Pilar; Garcia‐Casco, AntonioORCIDiD (Geochemistry, Geophysics, Geosystems, 2022-10-28)
      Abstract

      In this contribution we report the first systematic study of zircon U‐Pb geochronology ...