Auflistung Geochemie, Mineralogie, Petrologie nach Titel
Anzeige der Dokumente 318-337 von 567
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Nano-Magnetite Aggregates in Red Soil on Low Magnetic Bedrock, Their Changes During Source-Sink Transfer, and Implications for Paleoclimate Studies
; ; ; ; ; ; ; ; ; (Journal of Geophysical Research: Solid Earth, 2020)
Soil and lake sediments are important paleoclimate archives often forming a source-sink setting. To better understand magnetic properties in such settings, we studied red soil on low-magnetic bedrock and subrecent sediments ... -
Nano-Powdered Calcium Carbonate Reference Materials: Significant Progress for Microanalysis?
; Garbe-Schönberg, Dieter; Veter, Marina; Stoll, Brigitte; ; ; Lugli, Federico; Jentzen, Anna; ; Wassenburg, Jasper A.; Jacob, Dorrit E.; Haug, Gerald H. (Geostandards and Geoanalytical Research, 2019)
Homogeneity, mass fractions of about forty trace elements and Sr isotope composition of Ca carbonate reference materials (RMs) between original and nano-powdered pellets are compared. Our results using nanosecond and ... -
NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis
; Lugli, Federico; Hattendorf, Bodo; ; ; Guinoiseau, Damien; (Geostandards and Geoanalytical Research, 2019)
The in situ measurement of Sr isotopes in carbonates by MC-ICP-MS is limited by the availability of suitable microanalytical reference materials (RMs), which match the samples of interest. Whereas several well-characterised ... -
Natural blue zircon from Vesuvius
; ; ; ; ; (Mineralogy and Petrology, 2020-10-31)
Zircon from syenitic ejecta of Vesuvius (Campania, Italy) is unusually blue, a property shared with gem zircon from Ratanakiri province (Cambodia), which turns from natural reddish-brown to blue when heated under reducing ... -
Near-Complete Local Reduction of Arctic Stratospheric Ozone by Severe Chemical Loss in Spring 2020
; ; Lehmann, R.; ; ; ; Davies, J.; ; Jepsen, N.; ; Lyall, N.; Rex, M. (Geophysical Research Letters, 2020)
In the Antarctic ozone hole, ozone mixing ratios have been decreasing to extremely low values of 0.01–0.1 ppm in nearly all spring seasons since the late 1980s, corresponding to 95–99% local chemical loss. In contrast, ... -
Neon, Helium and Argon isotope systematics of the Hawaiian hotspot
(Univ. Potsdam, 2009)This study presents noble gas compositions (He, Ne, Ar, Kr, and Xe) of lavas from several Hawaiian volcanoes. Lavas from the Hawaii Scientific Drilling Project (HSDP) core, surface samples from Mauna Kea, Mauna Loa, Kilauea, ... -
New U–Pb zircon ages of Nyong Complex meta‐plutonites: Implications for the Eburnean/Trans‐Amazonian Orogeny in southwestern Cameroon (Central Africa)
; ; Afzal M, Gulzar; Nsangou Ngapna, Moussa; Mvondo Ondoa, Joseph; Ekodeck, Georges Emmanuel (Geological Journal, 2020-10-22)
New LA–ICP–MS U–Pb zircon ages from the Nyong Complex of southwestern Cameroon—a part of the West Central African Fold Belt—trace Late Mesoarchean (∼2,850 Ma), Middle Palaeoproterozoic (∼2,080 Ma), and Neoproterozoic ... -
Nitrogen and Phosphorus Control Soil Methane Uptake in Tropical Montane Forests
; ; ; ; (Journal of Geophysical Research: Biogeosciences, 2021-08-19)
Tropical forests contribute about one third to global annual CH4 uptake by soils. Understanding the factors that control the soil‐atmosphere exchange of CH4 at a large scale is a critical step to improve the CH4 flux ... -
Non-invasive detection and localization of microplastic particles in a sandy sediment by complementary neutron and X-ray tomography
; ; ; (Journal of Soils and Sediments, 2021-01-27)
Purpose: Microplastics have become a ubiquitous pollutant in marine, terrestrial and freshwater systems that seriously affects aquatic and terrestrial ecosystems. Common methods for analysing microplastic ... -
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 ...
