Auflistung Geochemie, Mineralogie, Petrologie nach Titel
Anzeige der Dokumente 441-460 von 567
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Stable isotopes of water reveal differences in plant – soil water relationships across northern environments
(Hydrological Processes, 2021-01-24)We compared stable isotopes of water in plant stem (xylem) water and soil collected over a complete growing season from five well‐known long‐term study sites in northern/cold regions. These spanned a decreasing temperature ... -
Staircase array of inclined refractive multi‐lenses for large field of view pixel super‐resolution scanning transmission hard X‐ray microscopy
(Journal of Synchrotron Radiation, 2021-03-19)Owing to the development of X‐ray focusing optics during the past decades, synchrotron‐based X‐ray microscopy techniques allow the study of specimens with unprecedented spatial resolution, down to 10 nm, using soft and ... -
Stepwise Weakening of the Pliocene Leeuwin Current
(Geophysical Research Letters, 2019)The Indonesian Throughflow (ITF) operates as an important link in global thermohaline circulation, and ITF variability probably modulated Pliocene climate change. Yet, whether ITF variability accounted for oceanographic ... -
Storm Event–Driven Occurrence and Transport of Dissolved and Sorbed Organic Micropollutants and Associated Effects in the Ammer River, Southwestern Germany
(Environmental Toxicology and Chemistry, 2020-11-30)Storm events lead to agricultural and urban runoff, to mobilization of contaminated particulate matter, and to input from combined sewer overflows into rivers. We conducted time‐resolved sampling during a storm event at ... -
Strain Rate-Dependent Hardening-Softening Characteristics of Gas Hydrate-Bearing Sediments
(Geochemistry, Geophysics, Geosystems, 2019)The presence of gas hydrates (GHs) increases the stiffness and strength of marine sediments. In elasto-plastic constitutive models, it is common to consider GH saturation (Sh) as key internal variable for defining the ... -
Strengths and limitations of in situ U–Pb titanite petrochronology in polymetamorphic rocks: An example from western Maine, USA
(Journal of Metamorphic Geology, 2022-03-18)Titanite is a potentially powerful U–Pb petrochronometer that may record metamorphism, metasomatism, and deformation. Titanite may also incorporate significant inherited Pb, which may lead to inaccurate and geologically ... -
Strong Sequestration of Hydrogen Into the Earth's Core During Planetary Differentiation
(Geophysical Research Letters, 2020)We explore the partitioning behavior of hydrogen between coexisting metal and silicate melts at conditions of the magma ocean and the current core–mantle boundary with the help of density functional theory molecular dynamics. ... -
Structural and thermodynamic properties of Ca-Al-bearing amphiboles
(Univ. Berlin, 2001) -
Structural evolution of continental and marine Permian rock salt of the North German Basin: constraints from microfabrics, geochemistry and U–Pb ages
(International Journal of Earth Sciences, 2020-08-09)Analyzing the dynamics of microstructural response on natural deformation in rock salt, we present microfabric, EBSD, geochemical and U–Pb data, obtained from Permian salt formations of the Kiel-Honigsee salt wall in ... -
Structure determination from unindexed powder data from scratch by a global optimization approach using pattern comparison based on cross‐correlation functions
(Acta Crystallographica Section B, 2022-03-17)A method of ab initio crystal structure determination from powder diffraction data for organic and metal–organic compounds, which does not require prior indexing of the powder pattern, has been developed. Only a reasonable ... -
Structure determination of organic compounds by a fit to the pair distribution function from scratch without prior indexing
(Journal of Applied Crystallography, 2021-05-09)A method for the ab initio crystal structure determination of organic compounds by a fit to the pair distribution function (PDF), without prior knowledge of lattice parameters and space group, has been developed. The method ... -
Sub-arc mantle enrichment in the Sunda rear-arc inferred from HFSE systematics in high-K lavas from Java
(Contributions to Mineralogy and Petrology, 2021-12-21)Many terrestrial silicate reservoirs display a characteristic depletion in Nb, which has been explained in some studies by the presence of reservoirs on Earth with superchondritic Nb/Ta. As one classical example, K-rich ... -
Sub‐micrometer focusing setup for high‐pressure crystallography at the Extreme Conditions beamline at PETRA III
(Journal of Synchrotron Radiation, 2022-04-05)Scientific tasks aimed at decoding and characterizing complex systems and processes at high pressures set new challenges for modern X‐ray diffraction instrumentation in terms of X‐ray flux, focal spot size and sample ... -
Sulfide Dissolution and Awaruite Formation in Continental Serpentinization Environments and Its Implications to Supporting Life
(Journal of Geophysical Research: Solid Earth, 2021-05-20)Serpentinization environments are key locations that support microbial communities by the abiogenic formation of reduced species associated with peridotite alteration. Here we studied partially serpentinized peridotites ... -
Sulfur cycling in oceanic oxygen minimum zones
(Limnology and Oceanography, 2021-05-10)The sulfur cycle is an important, although understudied facet of today's modern oxygen minimum zones (OMZs). Sulfur cycling is most active in highly productive coastal OMZs where sulfide‐rich sediments interact with the ... -
Symmetry relations in wurtzite nitrides and oxide nitrides and the curious case of Pmc21
(Acta Crystallographica Section A, 2021-03-23)Binary III–V nitrides such as AlN, GaN and InN in the wurtzite‐type structure have long been considered as potent semiconducting materials because of their optoelectronic properties, amongst others. With rising concerns ... -
Syn-metamorphic sulfidation of the Gamsberg zinc deposit, South Africa
(Mineralogy and Petrology, 2021-09-06)The Mesoproterozoic Aggeneys-Gamsberg ore district, South Africa, is one of the world´s largest sulfidic base metal concentrations and well-known as a prime example of Broken Hill-type base metal deposits, traditionally ... -
Synchronous Changes in Sediment Transport and Provenance at the Iceland-Faroe Ridge Linked to Millennial Climate Variability From 55 to 6 ka BP
(Geochemistry, Geophysics, Geosystems, 2019)Unique marine sediment cores retrieved from the southwestern slope of the Iceland-Faroe Ridge (IFR), close to the main axis of the Iceland-Scotland Overflow Water (ISOW), revealed prominent sedimentary cycles reflecting ...