Geochemie, Mineralogie, Petrologie
Recent Submissions
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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 ... -
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 ... -
Collisional mixing between inner and outer solar system planetesimals inferred from the Nedagolla iron meteorite
; ; ; (Meteoritics & Planetary Science, 2021-10-18)
The ungrouped iron meteorite Nedagolla is the first meteorite with bulk Mo, Ru, and Ni isotopic compositions that are intermediate between those of the noncarbonaceous (NC) and carbonaceous (CC) meteorite reservoirs. The ... -
Precipitation and Lake Water Evaporation Recorded by Terrestrial and Aquatic n‐Alkane δ2H Isotopes in Lake Khar Nuur, Mongolia
; ; ; ; ; (Geochemistry, Geophysics, Geosystems, 2022-02-17)
The compound‐specific hydrogen isotopic composition (δ2H) of n‐alkanes is a valuable proxy to investigate hydrological conditions in lake sediments. While terrestrial n‐alkanes reflect the isotopic signal of the local ... -
Thermolab: A Thermodynamics Laboratory for Nonlinear Transport Processes in Open Systems
; (Geochemistry, Geophysics, Geosystems, 2022-03-31)
We developed a numerical thermodynamics laboratory called “Thermolab” to study the effects of the thermodynamic behavior of nonideal solution models on reactive transport processes in open systems. The equations of the ... -
Toward Reconciling Radiocarbon Production Rates With Carbon Cycle Changes of the Last 55,000 Years
; ; ; (Paleoceanography and Paleoclimatology, 2022-02-16)
Since it is currently not understood how changes in 14C production rate (Q), and in the carbon cycle, can be combined to explain the reconstructed atmospheric Δ14C record, we discuss possible reasons for this knowledge ... -
Effects of the Hydrous Domain in the Mantle Wedge on Magma Formation and Mixing at the Northeast Lau Spreading Center, SW Pacific
; ; ; ; ; ; (Geochemistry, Geophysics, Geosystems, 2022-03-07)
Abundant volcanic activity occurs in the back‐arc region of the northern Tofua island arc where the Northeast Lau Spreading Center (NELSC) propagates southwards into older crust causing the formation of numerous seamounts ... -
Probability Distributions of Radiocarbon in Open Linear Compartmental Systems at Steady‐State
; ; ; (Journal of Geophysical Research: Biogeosciences, 2022-03-24)
Radiocarbon (14C) is commonly used as a tracer of the carbon cycle to determine how fast carbon moves between different reservoirs such as plants, soils, rivers, or oceans. However such studies mostly emphasize the mean ... -
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 ... -
Multi‐Band Raman Analysis of Radiation Damage in Zircon for Thermochronology: Partial Annealing and Mixed Signals
; ; (Geochemistry, Geophysics, Geosystems, 2022-01-24)
Four zircon Raman bands were previously calibrated to give consistent estimates of the accumulated self‐irradiation α‐dose in unannealed volcanic samples. Partial annealing of radiation damage produces inconsistent values ... -
The Subducting Slab as a Chromatographic Column: Regimes of Sub‐Solidus Mass Transport as a Function of Lithospheric Hydration State, With Special Reference to the Fate of Carbonate
; (Journal of Geophysical Research: Solid Earth, 2022-05-31)
We investigate the chemical budget of subduction zones at sub‐solidus conditions using a thermodynamic‐numerical simulation in which all major rock components are treated as soluble and potentially mobile in aqueous fluids. ... -
Electrochemical Properties of Peat Particulate Organic Matter on a Global Scale: Relation to Peat Chemistry and Degree of Decomposition
; ; (Global Biogeochemical Cycles, 2022-02-16)
Methane production in peatlands is controlled by the availability of electron acceptors for microbial respiration, including peat dissolved organic matter (DOM) and particulate organic matter (POM). Despite the much larger ... -
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. ... -
The Effect of Land Use Classification on the Gas‐Phase and Particle Composition of the Troposphere: Tree Species Versus Forest Type Information
; ; ; ; (Journal of Geophysical Research: Atmospheres, 2022-04-08)
Relationships between vegetation and air quality are intricate and still not fully understood. For regional air quality assessments, a better understanding of the diverse feedback mechanisms is crucial. The present article ... -
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 ... -
Simulated Future Trends in Marine Nitrogen Fixation Are Sensitive to Model Iron Implementation
; ; ; ; ; ; (Global Biogeochemical Cycles, 2022-02-24)
Biological nitrogen fixation is an important oceanic nitrogen source, potentially stabilizing marine fertility in an increasingly stratified and nutrient‐depleted ocean. Iron limitation of low latitude primary producers ... -
Evaluating urban micrometeorites as a research resource—A large population collected from a single rooftop
; ; (Meteoritics & Planetary Science, 2021-07-27)
We report the recovery and characterization of a new urban micrometeorite collection derived from the rooftop of an industrial building in Germany. We identified 315 micrometeorites (diameter: 55–515 µm, size peak: ˜150 µm, ... -
Kinematics of Crystal Growth in Single‐Seal Syntaxial Veins in Limestone ‐ A Phase‐Field Study
; ; ; ; ; (Journal of Geophysical Research: Solid Earth, 2021-09-28)
Building on recent developments in phase‐field modeling of structural diagenesis, we present an analysis of single‐seal syntaxial calcite vein microstructure in a variety of limestones. We focus on the effects of fracture ... -
Formation of chondrule analogs aboard the International Space Station
; ; ; ; ; ; ; (Meteoritics & Planetary Science, 2021-08-21)
Chondrules are thought to play a crucial role in planet formation, but the mechanisms leading to their formation are still a matter of unresolved discussion. So far, experiments designed to understand chondrule formation ... -
Assessing the robustness of carbonate‐associated sulfate during hydrothermal dolomitization of the Latemar platform, Italy
; ; ; (Terra Nova, 2021-09-12)
Carbonate‐associated sulfate (CAS) is an important proxy for reconstructing marine sulfur cycling throughout Earth's history. In order to assess the impact of carbonate neomorphism on δ34SCAS data, a mineralogical‐spatial ... -
Increased petrogenic and biospheric organic carbon burial in sub‐Antarctic fjord sediments in response to recent glacier retreat
; ; ; ; ; ; ; (Limnology and Oceanography, 2021-10-28)
Fjords are recognized as hotspots of organic carbon (OC) burial in the coastal ocean. In fjords with glaciated catchments, glacier discharge carries large amounts of suspended matter. This sedimentary load includes OC from ... -
Blaubeuren, Cloppenburg, and Machtenstein—Three recently recognized H‐group chondrite finds in Germany with distinct terrestrial ages and weathering effects
; ; ; ; ; ; ; (Meteoritics & Planetary Science, 2022-01-17)
In the last 7 years, three meteorites (Blaubeuren, Cloppenburg, and Machtenstein) found in Germany were identified as chondrites. Two of these rocks had been recovered from the impact sites decades ago but were not considered ... -
Do tree species affect decadal changes in soil organic carbon and total nitrogen stocks in Danish common garden experiments?
; ; ; ; ; (European Journal of Soil Science, 2021-12-23)
Temperate forest soils are often considered as an important sink for atmospheric carbon (C), thereby buffering anthropogenic CO2 emissions. However, the effect of tree species composition on the magnitude of this sink is ... -
Impacts of Drying and Rewetting on the Radiocarbon Signature of Respired CO2 and Implications for Incubating Archived Soils
; ; ; ; (Journal of Geophysical Research: Biogeosciences, 2021-09-14)
The radiocarbon signature of respired CO2 (∆14C‐CO2) measured in laboratory soil incubations integrates contributions from soil carbon pools with a wide range of ages, making it a powerful model constraint. Incubating ... -
Partially open grain and phase boundaries as fluid pathways in metamorphic and magmatic rocks
;; ; (Journal of Metamorphic Geology, 2021-07-28)
Transmission electron microscopy and 3D focused ion beam/scanning electron microscope nanotomography are applied to grain and phase boundaries between quartz, plagioclase, K‐feldspar, clinopyroxene, amphibole, and calcite. ...
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