Browsing Geochemie, Mineralogie, Petrologie by Issue Date
Now showing items 1-20 of 353
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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. ... -
Geochronology and petrogenesis of granitoids and associated mafic enclaves from Ghohroud in the Urumieh–Dokhtar Magmatic Arc (Iran): Evidence for magma mixing during the closure of the Neotethyan Ocean
(Geological Journal, 2022-05-18)The Ghohroud granitoids (GG), containing mafic microgranular enclaves (MMEs) are located in the central part of the Urumieh‐Dokhtar Magmatic Arc (UDMA) in central Iran. They are associated with the subduction‐related ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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. ... -
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 ... -
Iron Exports From Catchments Are Constrained by Redox Status and Topography
; ; ; ; ; ; (Global Biogeochemical Cycles, 2022-01-18)
Fe(III) hydroxides stabilize organic carbon (OC) and P in soils. Observations of rising stream Fe concentrations are controversially posited to result from a flushing of iron‐rich deeper soil layers or a decrease of competing ... -
Assessing Volcanic Controls on Miocene Climate Change
; ; ; (Geophysical Research Letters, 2022-01-18)
The Miocene period saw substantially warmer Earth surface temperatures than today, particularly during a period of global warming called the Mid Miocene Climatic Optimum (MMCO; ∼17–15 Ma). However, the long‐term drivers ... -
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 ...