Auflistung Geochemie, Mineralogie, Petrologie nach Titel
Anzeige der Dokumente 327-346 von 567
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Non‐exchangeable stable hydrogen isotope ratios in clay minerals and soil clay fractions: A method test
; ; ; (European Journal of Soil Science, 2022-08-04)
Stable hydrogen isotope ratios (δ2H values) in structural hydroxyl groups of pedogenic clay minerals are inherited from the surrounding water at the time of their formation. Only non‐exchangeable H preserves the environmental ... -
Northeast Siberian Permafrost Ice‐Wedge Stable Isotopes Depict Pronounced Last Glacial Maximum Winter Cooling
; ; ; ; ; ; ; (Geophysical Research Letters, 2021-04-09)
Stable isotopes (δ18O, δD) of wedge ice hold potential to reconstruct past winter climate conditions. Here, we present records of the marine isotope stages (MIS) 3 and 2 including the last Glacial maximum (LGM) from Bol’shoy ... -
Novel experimental setup for megahertz X‐ray diffraction in a diamond anvil cell at the High Energy Density (HED) instrument of the European X‐ray Free‐Electron Laser (EuXFEL)
Liermann, H. P.; Konôpková, Z.; Appel, K.; Prescher, C.; Schropp, A.; Cerantola, V.; Husband, R. J.; McHardy, J. D.; McMahon, M. I.; McWilliams, R. S.; Pépin, C. M.; Mainberger, J.; Roeper, M.; Berghäuser, A.; Damker, H.; Talkovski, P.; Foese, M.; Kujala, N.; Ball, O. B.; Baron, M. A.; Briggs, R.; Bykov, M.; Bykova, E.; Chantel, J.; Coleman, A. L.; Cynn, H.; Dattelbaum, D.; Dresselhaus-Marais, L. E.; Eggert, J. H.; Ehm, L.; Evans, W. J.; Fiquet, G.; Frost, M.;; Goncharov, A. F.; Hwang, H.; Jenei, Zs.; Kim, J.-Y.; Langenhorst, F.; Lee, Y.; Makita, M.; Marquardt, H.; McBride, E. E.; Merkel, S.; Morard, G.; O'Bannon, E. F.; Otzen, C.; Pace, E. J.; Pelka, A.; Pigott, J. S.; Prakapenka, V. B.; Redmer, R.; Sanchez-Valle, C.; Schoelmerich, M.; Speziale, S.; Spiekermann, G.; Sturtevant, B. T.; Toleikis, S.; Velisavljevic, N.; Wilke, M.; Yoo, C.-S.; Baehtz, C.; Zastrau, U.; Strohm, C. (Journal of Synchrotron Radiation, 2021-05-02)
The high‐precision X‐ray diffraction setup for work with diamond anvil cells (DACs) in interaction chamber 2 (IC2) of the High Energy Density instrument of the European X‐ray Free‐Electron Laser is described. This includes ... -
Numerically stable form factor of any polygon and polyhedron
(Journal of Applied Crystallography, 2021-03-25)Coordinate‐free expressions for the form factors of arbitrary polygons and polyhedra are derived using the divergence theorem and Stokes's theorem. Apparent singularities, all removable, are discussed in detail. Cancellation ... -
Ocean resurge-induced impact melt dynamics on the peak-ring of the Chicxulub impact structure, Mexico
; ; ;; ; ; ; ; (International Journal of Earth Sciences, 2021-03-18)
Core from Hole M0077 from IODP/ICDP Expedition 364 provides unprecedented evidence for the physical processes in effect during the interaction of impact melt with rock-debris-laden seawater, following a large meteorite ... -
Olivine aggregates reveal a complex collisional history of the main group pallasite parent body
; (Meteoritics & Planetary Science, 2022-04-08)
Olivine aggregates, bodies found in pallasites that consist of olivines with coherent grain boundaries and minor amounts of Fe‐Ni and troilite, likely represent well‐preserved samples of different mantle regions of pallasite ... -
On incoherent diffractive imaging
(Acta Crystallographica Section A, 2021-08-27)Incoherent diffractive imaging (IDI) promises structural analysis with atomic resolution based on intensity interferometry of pulsed X‐ray fluorescence emission. However, its experimental realization is still pending and ... -
On the Operating Mode of Bimetallic Systems for Environmental Remediation
(Journal of hazardous materials, 2008)
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On the Propagation of Reaction Fronts in a Sandy Aquifer Over 20+ Years: Lessons From a Test Site in Northwestern Germany
; ; ; ; (Water Resources Research, 2021-08-09)
Despite reduction measures, nitrate and aluminum concentrations remain high in aquifers in northwestern Europe. To evaluate the effectiveness of groundwater protection policies, the long‐term fate of these contaminants in ... -
On the validity of specific rate constants (kSA) in Fe0/H2O systems
(Journal of hazardous materials, 2009)
The validity of the specific reaction rate constants (kSA) in modelling contaminant removal in Fe0/H2O systems is questioned. It is shown that the current kSA-model does not consider the large reactive surface area provided ... -
One‐Pot Synthesis of Xanthate‐Functionalized Cellulose for the Detection of Micromolar Copper(II) and Nickel(II) Ions
(CLEAN – Soil, Air, Water, 2019-09-23)A one‐pot synthesis and application of cellulose‐based sensors to efficiently detect various toxic metal ions in aqueous solutions in micromolar quantities is reported. Cellulose microfibers have been functionalized with ... -
Optimized reconstruction of the crystallographic orientation density function based on a reduced set of orientations
(Journal of Applied Crystallography, 2020)Crystallographic textures, as they develop for example during cold forming, can have a significant influence on the mechanical properties of metals, such as plastic anisotropy. Textures are typically characterized by a ... -
Origin and fate of dissolved organic matter in four shallow Baltic Sea estuaries
; ; ; ; ; ; ; ; ; ; ; ; ; (Biogeochemistry, 2020-10-15)
Coastal waters have strong gradients in dissolved organic matter (DOM) quantity and characteristics, originating from terrestrial inputs and autochthonous production. Enclosed seas with high freshwater input therefore ... -
Origin of 182W Anomalies in Ocean Island Basalts
; ; ; ; ; (Geochemistry, Geophysics, Geosystems, 2023-02-18)
Ocean island basalts (OIB) show variable 182W deficits that have been attributed to either early differentiation of the mantle or core‐mantle interaction. However, 182W variations may also reflect ... -
Origin of High Mg and SO4 Fluids in Sediments of the Terceira Rift, Azores-Indications for Caminite Dissolution in a Waning Hydrothermal System
; ; Wallmann, K.; ; Tatzel, M.; Schurr, S. L.; ; Haffert, L.; ; ; ; ; ; ; ; (Geochemistry, Geophysics, Geosystems, 2019)
During R/V Meteor cruise 141/1, pore fluids of near surface sediments were investigated to find indications for hydrothermal activity in the Terceira Rift (TR), a hyperslow spreading center in the Central North Atlantic ... -
Origin of isolated seamounts in the Canary Basin (East Atlantic): The role of plume material in the origin of seamounts not associated with hotspot tracks
; ; ; ; ; (Terra Nova, 2020)
In contrast to seamount chains, small solitary seamounts/seamount groups have rarely been sampled despite their large number and therefore their origins remain enigmatic. Here we present new 40Ar/39Ar, trace element and ... -
Oxygen Consumption of Resuspended Sediments of the Upper Elbe Estuary: Process Identification and Prognosis
; ; ; ; (Aquatic Geochemistry, 2021-11-30)
The resuspension of sediment leads to an increased release of nutrients and organic substances into the overlying water column, which can have a negative effect on the oxygen budget. Especially in the warmer months with a ... -
Oxygen Dependent Temperature Regulation of Benthic Fluxes in Reservoirs
; ; ; ; (Global Biogeochemical Cycles, 2023-04-02)
Temperature and dissolved oxygen concentration are critical factors affecting the exchange of solutes between sediment and water; both factors will be affected by warming of lakes and thereby influence water quality. ... -
Oxygen Vacancy Ordering in Aluminous Bridgmanite in the Earth's Lower Mantle
; ; Siegel, Renée; ; ; ; (Geophysical Research Letters, 2019)
Oxygen vacancies (OVs), that charge-balance the replacement of octahedrally coordinated Si4+ by Al3+ in the mineral bridgmanite, will influence transport properties in the lower mantle but little is known about their ... -
Oxygen Vacancy Substitution Linked to Ferric Iron in Bridgmanite at 27 GPa
; ; ; (Geophysical Research Letters, 2020)
Ferric iron can be incorporated into the crystal structure of bridgmanite by either oxygen vacancy substitution (MgFeO2.5 component) or charge-coupled substitution (FeFeO3 component) mechanisms. We investigated the ...
