Browsing Geochemie, Mineralogie, Petrologie by Title
Now showing items 1-20 of 507
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10Be/9Be Ratios Reveal Marine Authigenic Clay Formation
Bernhardt, A.; Oelze, M.; Bouchez, J.;
; Mohtadi, M.; Christl, M.; Wittmann, H. (Geophysical Research Letters, 2020-02-10)
As reverse weathering has been shown to impact long‐term changes in atmospheric CO2 levels, it is crucial to develop quantitative tools to reconstruct marine authigenic clay formation. We explored the potential of the ... -
A discussion on `Domain formation and phase transitions in the wurtzite‐based heterovalent ternaries: a Landau theory analysis'
Quayle, Paul C.; (Acta Crystallographica Section A, 2021-03-23)
Heterovalent ternary nitrides are considered one of the promising classes of materials for photovoltaics, combining attractive physical properties with low toxicity and element abundance. One of the front‐runner systems ... -
A history of violence: magma incubation, timing and tephra distribution of the Los Chocoyos supereruption (Atitlán Caldera, Guatemala)
; Schindlbeck‐Belo, Julie C.; ; ; ; ; Pérez, Wendy; Harvey, Janet C.; Wang, Kuo‐Lung; Lee, Hao‐Yang (Journal of Quaternary Science, 2021-01-11)
The climactic Los Chocoyos (LCY) eruption from Atitlán caldera (Guatemala) is a key chronostratigraphic marker for the Quaternary period given the extensive distribution of its deposits that reached both the Pacific and ... -
A new concept for temporal gating of synchrotron X‐ray pulses
(Journal of Synchrotron Radiation, 2021-02-05)A new concept for temporal gating of synchrotron X‐ray pulses based on laser‐induced thermal transient gratings is presented. First experimental tests of the concept yield a diffraction efficiency of 0.18%; however, the ... -
A new hydrate of magnesium carbonate, MgCO3·6H2O
(Acta Crystallographica Section C, 2020)During investigations of the formation of hydrated magnesium carbonates, a sample of the previously unknown magnesium carbonate hexahydrate (MgCO3·6H2O) was synthesized in an aqueous solution at 273.15 K. The crystal ... -
A New Method for Determining Fluid Flux at High Pressures Applied to the Dehydration of Serpentinites
; ; ; ; ; ; ; ; ; ; (Geochemistry, Geophysics, Geosystems, 2022-09-08)
A new method to determine fluid flux at high pressures and temperatures has been developed and used to study serpentinites at subduction zone conditions. Drill cores of a natural antigorite‐serpentinite with a strong ... -
A note on the wedge reversion antisymmetry operation and 51 types of physical quantities in arbitrary dimensions
(Acta Crystallographica Section A, 2023-06-05)The paper by Gopalan [
(2020). Acta Cryst. A76 , ... -
A novel experimental approach for nanostructure analysis: simultaneous small-angle X-ray and neutron scattering
(Journal of Applied Crystallography, 2020)Exploiting small-angle X-ray and neutron scattering (SAXS/SANS) on the same sample volume at the same time provides complementary nanoscale structural information in two different contrast situations. Unlike an independent ... -
A novel method for the quantitative morphometric characterization of soluble salts on volcanic ash
; ; ; ; (Bulletin of Volcanology, 2021-12-06)
Formation of soluble sulfate and halide salts on volcanic ash particles via syn-eruptive interactions between ash surfaces and magmatic gases is a ubiquitous phenomenon in explosive eruptions. Surficial salts may be rapidly ... -
A statistical analysis of time trends in atmospheric ethane
; ; ; ; ; ; ; ; (Climatic Change, 2020-08-27)
Ethane is the most abundant non-methane hydrocarbon in the Earth’s atmosphere and an important precursor of tropospheric ozone through various chemical pathways. Ethane is also an indirect greenhouse gas (global warming ... -
A Triad Photoanode for Visible Light‐Driven Water Oxidation via Immobilization of Molecular Polyoxometalate on Polymeric Carbon Nitride
; ; ; ; ; ; ; ; (Advanced Sustainable Systems, 2022-03-08)
Due to their availability, low cost, nontoxicity, and tunability, polymeric carbon nitrides (CNx) represent one of the most attractive materials classes for the development of fully sustainable photo(electro)catalytic ... -
Accessories in Kaiserstuhl carbonatites and related rocks as accurate and faithful recorders of whole rock age and isotopic composition
;; ; ; (International Journal of Earth Sciences, 2021-12-09)
The accessories perovskite, pyrochlore, zirconolite, calzirtite and melanite from carbonatites and carbonate-rich foidites from the Kaiserstuhl are variously suited for the in situ determination of their U–Pb ages and Sr, ... -
Accumulation of germanium (Ge) in plant tissues of grasses is not solely driven by its incorporation in phytoliths
(Biogeochemistry, 2020-02-20)Ge/Si ratios of plant phytoliths have been widely used to trace biogeochemical cycling of Si. However, until recently, information on how much of the Ge and Si transferred from soil to plants is actually stored in phytoliths ... -
Advances in understanding calcite varve formation: new insights from a dual lake monitoring approach in the southern Baltic lowlands
; Dräger, Nadine; ; ; Pinkerneil, Sylvia; ; Lindemann, Christin; ; Brademann, Brian; Kaszubski, Michał; ; ; ; ; (Boreas, 2021-02-09)
We revise the conceptual model of calcite varves and present, for the first time, a dual lake monitoring study in two alkaline lakes providing new insights into the seasonal sedimentation processes forming these varves. ... -
Age and origin of groundwater resources in the Ararat Valley, Armenia: a baseline study applying hydrogeochemistry and environmental tracers
;; ; ; ; ; ; (Hydrogeology Journal, 2021-08-28)
Within the Ararat Valley (Armenia), a continuously growing water demand (for irrigation and fish farming) and a simultaneous decline in groundwater recharge (due to climate change) result in increasing stress on the local ... -
Airborne and ground level flask sampling for regional carbon budgets - the potential of multiple tracer and isotope analyses ; development of a new "Investigation Strategy" and of an improved "Sampling System"
(Univ. Hamburg, 2005)Aim of the study was to test the capability of multiple trace gas analyses for the assessment of regional carbon budgets. Therefore, air samples were taken by airborne and ground level activities during several field ... -
Amplified Arctic Surface Warming and Sea Ice Loss Due to Phytoplankton and Colored Dissolved Material
; Losa, Svetlana N.; ; ; (Geophysical Research Letters, 2020-11-02)
Optically active water constituents attenuate solar radiation and hence affect the vertical distribution of energy in the upper ocean. To understand their implications, we operate an ocean biogeochemical model coupled to ... -
An unusual compound object in Yamato 793408 (H3.2-an): The missing link between compound chondrules and macrochondrules?
; ; ; Gurenko, Andrey; (Meteoritics & Planetary Science, 2020)
We found a large (~2 mm) compound object in the primitive Yamato 793408 (H3.2-an) chondrite. It consists mostly of microcrystalline material, similar to chondrule mesostasis, that hosts an intact barred olivine (BO) ... -
Analyse von Butylzinnverbindungen in Sedimenten mittels GC-AED
(Univ. Hamburg, 2007)Organotin compounds are variously used industrial chemicals. One of the most toxicological relevant compounds is tributyltin (TBT). TBT has been used as an effective component in antifouling paints for decades. Thus, it ... -
Analytical Artefacts Preclude Reliable Isotope Ratio Measurement of Internal Water in Coral Skeletons
; ; ; ; ; ; ; ; ; (Geostandards and Geoanalytical Research, 2022-07-12)
Internal water in cold‐water and tropical coral skeletons was extracted and measured for its oxygen and hydrogen isotope ratios. Water was extracted by crushing pieces of coral hard tissue in a percussion device connected ...
