Auflistung Geochemie, Mineralogie, Petrologie nach Titel
Anzeige der Dokumente 401-420 von 567
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Rheology of melts from the colli albani volcanic district (Italy): a case study
(Contributions to Mineralogy and Petrology, 2020-08-14)In this study the first viscosity measurements in the glass transition range of melts from highly explosive large-volume eruptions from the Colli Albani Volcanic District (CAVD) are presented. The magmas are ultrapotassic, ... -
Riparian Microtopography Affects Event‐Driven Stream DOC Concentrations and DOM Quality in a Forested Headwater Catchment
(Journal of Geophysical Research: Biogeosciences, 2022-12-21)The transport of dissolved organic carbon (DOC) from the soils to inland waters plays an important role in the global carbon cycle. Widespread increases in DOC concentrations have been observed in surface waters over the ... -
ROBL‐II at ESRF: a synchrotron toolbox for actinide research
(Journal of Synchrotron Radiation, 2020-11-23)ROBL‐II provides four different experimental stations to investigate actinide and other alpha‐ and beta‐emitting radionuclides at the new EBS storage ring of ESRF within an energy range of 3 to 35 keV. The XAFS station ... -
Robust approaches for model‐free small‐angle scattering data analysis
(Journal of Applied Crystallography, 2022-05-28)The small‐angle neutron scattering data of nanostructured magnetic samples contain information regarding their chemical and magnetic properties. Often, the first step to access characteristic magnetic and structural length ... -
Rock magnetics of carbonate systems–investigating palaeodune archives on Fuerteventura (Canary Islands)
(Journal of Quaternary Science, 2020)The mineral magnetic properties of Pleistocene aeolian dune sands from the island of Fuerteventura (Canary Islands, Spain) were studied in order to reconstruct the palaeoenvironmental evolution of Pleistocene climates ... -
Sampling soil water along the pF curve for δ2H and δ18O analysis
(Hydrological Processes, 2020)Soil water stable isotopes are widely used across disciplines (e.g., hydrology, ecology, soil science, and biogeochemistry). However, the full potential of stables isotopes as a tool for characterizing the origin, flow ... -
Sampling, separation, and quantification of N‐acyl homoserine lactones from marine intertidal sediments
(Limnology and Oceanography: Methods, 2021-01-20)N‐acyl homoserine lactones (AHLs) are molecules produced by many Gram‐negative bacteria as mediators of cell‐cell signaling in a mechanism known as quorum sensing (QS). QS is widespread in marine bacteria regulating diverse ... -
Schwingungsspektroskopie von OH-führenden Defekten in Granat
(Univ. Berlin, 1999) -
Seamless Integration of the Coastal Ocean in Global Marine Carbon Cycle Modeling
(Journal of Advances in Modeling Earth Systems, 2022-08-26)We present the first global ocean‐biogeochemistry model that uses a telescoping high resolution for an improved representation of coastal carbon dynamics: ICON‐Coast. Based on the unstructured triangular grid topology of ... -
Seasonal Carbon Dynamics in the Near‐Global Ocean
(Global Biogeochemical Cycles, 2020-12-23)The seasonal cycle represents one of the largest signals of dissolved inorganic carbon (DIC) in the ocean, yet these seasonal variations are not well established at a global scale. Here, we present the Mapped Observation‐Based ... -
Seasonality of Organic Matter Degradation Regulates Nutrient and Metal Net Fluxes in a High Energy Sandy Beach
(Journal of Geophysical Research: Biogeosciences, 2020)During seawater circulation in permeable intertidal sands, organic matter degradation alters the composition of percolating fluids and remineralization products discharge into surficial waters. Concurrently, coastal seawater ... -
Secondary Minerals Drive Extreme Lithium Isotope Fractionation During Tropical Weathering
(Journal of Geophysical Research: Earth Surface, 2022-02-15)Lithium isotopes are used to trace weathering intensity, but little is known about the processes that fractionate them in highly weathered settings, where secondary minerals play a dominant role in weathering reactions. ... -
Sectioning effects of porphyritic chondrules: Implications for the PP/POP/PO classification and correcting modal abundances of mineralogically zoned chondrules
(Meteoritics & Planetary Science, 2020)Mineralogically zoned chondrules are a common chondrule type in chondrites. They consist of olivine cores, surrounded by low-Ca pyroxene rims. By serial sectioning porphyritic chondrules from carbonaceous, ordinary, and ... -
Sediment Properties Drive Spatial Variability of Potential Methane Production and Oxidation in Small Streams
(Journal of Geophysical Research: Biogeosciences, 2020)Emissions of the potent greenhouse gas methane (CH4) from streams and rivers are a significant component of global freshwater methane emissions. The distribution of CH4 production and oxidation within stream sections and ... -
Sediment Release in the Benguela Upwelling System Dominates Trace Metal Input to the Shelf and Eastern South Atlantic Ocean
(Global Biogeochemical Cycles, 2022-09-25)Upwelling of subsurface waters injects macronutrients (fixed N, P, and Si) and micronutrient trace metals (TMs) into surface waters supporting elevated primary production in Eastern Boundary Upwelling Regions. The eastern ... -
Sedimentological and carbonate isotope signatures to identify fluvial processes and catchment changes in a supposed impact ejecta‐dammed lake (Miocene, Germany)
(Sedimentology, 2021-06-20)The identification and distinction of fluvial from lacustrine deposits and the recognition of catchment changes are crucial for the reconstruction of climate changes in terrestrial environments. The investigated drill core ... -
Separation of the inelastic and elastic scattering in time‐of‐flight mode on the pinhole small‐angle neutron scattering diffractometer KWS‐2
(Journal of Applied Crystallography, 2021-07-30)To study and control the incoherent inelastic background in small‐angle neutron scattering, which makes a significant contribution to the detected scattering from hydrocarbon systems, the KWS‐2 small‐angle neutron scattering ... -
Serpentinization-driven H2 production from continental break-up to mid-ocean ridge spreading: unexpected high rates at the West Iberia margin
(2021)Molecular hydrogen (H2) released during serpentinization of mantle rocks is one of the main fuels for chemosynthetic life. Processes of H2 production at slow-spreading mid-ocean ridges (MORs) have received much attention ... -
Shallow‐marine carbonate cementation in Holocene segments of the calcifying green alga Halimeda
(Sedimentology, 2021-09-15)Early‐diagenetic cementation of tropical carbonates results from the combination of numerous physico‐chemical and biological processes. In the marine phreatic environment it represents an essential mechanism for the ... -
Shock-induced formation of wüstite and fayalite in a magnetite-quartz target rock
(Meteoritics & Planetary Science, 2019)Projectile–target interactions as a result of a large bolide impact are important issues, as abundant extraterrestrial material has been delivered to the Earth throughout its history. Here, we report results of shock-recovery ...