Auflistung Geochemie, Mineralogie, Petrologie nach Titel
Anzeige der Dokumente 279-298 von 565
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Machine learning for scattering data: strategies, perspectives and applications to surface scattering
(Journal of Applied Crystallography, 2023-01-24)Machine learning (ML) has received enormous attention in science and beyond. Discussed here are the status, opportunities, challenges and limitations of ML as applied to X‐ray and neutron scattering techniques, with an ... -
Mafic explosive volcanism at Llaima Volcano: 3D x-ray microtomography reconstruction of pyroclasts to constrain shallow conduit processes
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; (Bulletin of Volcanology, 2021-12-06)
Mafic volcanic activity is dominated by effusive to mildly explosive eruptions. Plinian and ignimbrite-forming mafic eruptions, while rare, are also possible; however, the conditions that promote such explosivity are still ... -
MAGEMin, an Efficient Gibbs Energy Minimizer: Application to Igneous Systems
; ; ; (Geochemistry, Geophysics, Geosystems, 2022-07-18)
Prediction of stable mineral equilibria in the Earth's lithosphere is critical to unravel the tectonomagmatic history of exposed geological sections. While the recent advances in geodynamic modeling allow us to explore the ... -
Manual measurement of angles in backscattered and transmission Kikuchi diffraction patterns
(Journal of Applied Crystallography, 2020)A historical tool for crystallographic analysis is provided by the Hilton net, which can be used for manually surveying the crystal lattice as it is manifested by the Kikuchi bands in a gnomonic projection. For a quantitative ... -
Mapping the 3D position of battery cathode particles in Bragg coherent diffractive imaging
(Journal of Synchrotron Radiation, 2023-02-16)In Bragg coherent diffractive imaging, the precise location of the measured crystals in the interior of the sample is usually missing. Obtaining this information would help the study of the spatially dependent behavior of ... -
Marble decay: towards a measure of marble degradation based on ultrasonic wave velocities and thermal expansion data
(Environmental Earth Sciences, 2021-05-23)Marble as ornamental and dimensional stones as well as in their natural environments show complex weathering phenomena. Physical, chemical, and biological weathering of marble are well documented. The impact of climate ... -
Measured and Simulated Carbon Dynamics in Midwestern U.S. Corn‐Soybean Rotations
; Wacha, K. M.; ; Hatfield, J. L.; Prueger, J. H. (Global Biogeochemical Cycles, 2020-12-29)
Corn (Zea mays L.) and soybean (Glycine max [L.] Merr.) production dominate Midwestern U.S. agriculture and impact the regional carbon and nitrogen cycles. Sustaining soil carbon is important for corn‐soybean production ... -
Measurement of crystallographic orientation of quartz crystal using Raman spectroscopy: application to entrapped inclusions
; ; ; (Contributions to Mineralogy and Petrology, 2021-10-15)
Raman spectroscopy has been widely used in mineralogy and petrology for identifying mineral phases. Some recent applications of Raman spectroscopy involve measuring the residual pressure of mineral inclusions, such as ... -
Mechanism of uranium removal from the aqueous solution by elemental iron
; Schöner, A.; Meinrath, G. (Journal of hazardous materials, 2006)
The effectiveness of elemental iron (Fe0) to remove uranium (U) from the aqueous phase has been demonstrated. While the mitigation effect is sure, discrepancies in the removal mechanism have been reported. The objective ... -
Mesoskopische Strukturen in kristallinen Systemen an zwei Beispielen aus Natur und Synthese - I. Die Leitfähigkeit der ferroelastischen Domänen in Bleiphosphat; II. Oszillatorische Biomineralisation in Molluskenschalen
(Univ. Hamburg, 2006)In dieser Arbeit werden zwei mesoskopische Systeme untersucht, zum ersten die ferroelastischen Domänen in Calcium-dotiertem Bleiphosphat, zum zweiten die oszillatorische Biomineralisation im Calcit und Aragonit von ... -
Mesozoic deposits of SW Gondwana (Namibia): unravelling Gondwanan sedimentary dispersion drivers by detrital zircon
(International Journal of Earth Sciences, 2020-04-25)The Namibian Mesozoic successions may be remnant of a high dynamic sedimentary system that is characterized by multiple stages of sediment accumulation and erosion with contemporaneous homogenization starting with the ... -
Metabasic rocks from the Variscan Schwarzwald (SW Germany): metamorphic evolution and igneous protoliths
(International Journal of Earth Sciences, 2021-03-22)In the Variscan Schwarzwald metabasic rocks form small bodies included within anatectic plagioclase-biotite gneisses. Many metabasites first underwent an eclogite-facies metamorphism at about 2.0 GPa and 670–700 °C, resulting ... -
Metall-Silikat-Verteilungsverhalten von Nickel und Kobalt in Abhängigkeit von Druck und Temperatur: Implikationen für planetare Differentiationsprozesse
(Univ. Köln, 2005)Die Erde, der Mond und die anderen terrestrischen Planeten haben einen eisen-nickelreichen, metallischen Kern, der sich in der Frühphase der Geschichte dieser Planeten von der Silikat-phase, die heute den Mantel bildet, ... -
Metamorphic gabbro and basalt in ophiolitic and continental nappes of the Zermatt region (Western Alps)
; (Swiss Journal of Geosciences, 2021-04-12)
The composition of meta-gabbro and meta-basalt occurring abundant and widespread in all nappes of the nappe stack exposed in the Zermatt region of the Western Alp shows distinct patterns related to the geodynamic origin ... -
Metapelite from the high‐ to ultrahigh‐pressure terrane of the Eastern Alps (Pohorje Mountains, Slovenia)—New pressure, temperature and time constraints on a polymetamorphic rock
; Massonne, Hans‐Joachim; Koller, Friedrich; Zhang, Junfeng (Journal of Metamorphic Geology, 2021-03-31)
The Austroalpine nappe stack of the Pohorje Mountains (Mts.) in northeastern Slovenia comprises a suite of eclogite facies metamorphic rocks that were partially assigned to Eo‐Alpine ultrahigh‐pressure metamorphism (UHPM). ... -
Methane oxidation and carbon assimilation in marine sediments
(Univ. Bremen, 2008)Anaerobe Oxidation of Methane, AOM, methanotrophy, stable isotope labeling, stable isotope probing, carbon assimilation, flow-through columns, ANME, Seep-SRB, Gullfaks, Tommeliten. - Anaerobic oxidation of methane (AOM) ... -
Microbially promoted calcite precipitation in the pelagic redoxcline: Elucidating the formation of the turbid layer
; ; ; ; ; ; ; ; ; ; (Geobiology, 2022-05-05)
Large bell‐shaped calcite formations called “Hells Bells” were discovered underwater in the stratified cenote El Zapote on the Yucatán Peninsula, Mexico. Together with these extraordinary speleothems, divers found a white, ... -
Mid-infrared reflectance spectroscopy of aubrite components
; ; ; Sohn, Martin; ; ; ; Helbert, Joern (Meteoritics & Planetary Science, 2020)
Aubrites Peña Blanca Spring and Norton County were studied in the mid-infrared reflectance as part of a database for the MERTIS (Mercury Radiometer and Thermal Infrared Spectrometer) instrument on the ESA/JAXA BepiColombo ... -
Mid-infrared spectroscopy of alkali feldspar samples for space application
; ; ; ; ; (Mineralogy and Petrology, 2020-07-30)
Feldspars are major components of terrestrial planetary surfaces. For future space application and the setup of a comprehensive reference database, Na- and K-rich alkali feldspars, NaAlSi3O8 – KAlSi3O8, have been investigated ... -
Middle to Late Pleistocene environments based on stable organic carbon and nitrogen isotopes of loess-palaeosol sequences from the Carpathian Basin
; ; ; ; ; ; ; ; (Boreas, 2020)
Stable organic carbon and nitrogen isotopes can be used to interpret past vegetation patterns and ecosystem qualities. Here we present these proxies for two loess-palaeosol sequences from the southern Carpathian Basin to ...
