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Direct Viscosity Measurement of Peridotite Melt to Lower‐Mantle Conditions: A Further Support for a Fractional Magma‐Ocean Solidification at the Top of the Lower Mantle
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- Geophysical Research Letters
, 2021-10-05)
As evidenced by isotope geochemistry, the persistence of primitive reservoirs indicates that the earth's lower mantle is likely to be heterogeneous. Such heterogeneity could be a legacy from magma‐ocean (MO) solidification. ...
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 ...
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 ...
Water Isotopic Signature of Surface Snow Metamorphism in Antarctica
(
- Geophysical Research Letters
, 2021-09-03)
Water isotope ratios of ice cores are a key source of information on past temperatures. Through fractionation within the hydrological cycle, temperature is imprinted in the water isotopic composition of snowfalls. However, ...
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 ...
Nitrogen and Phosphorus Control Soil Methane Uptake in Tropical Montane Forests
(
- Journal of Geophysical Research: Biogeosciences
, 2021-08-19)
Tropical forests contribute about one third to global annual CH4 uptake by soils. Understanding the factors that control the soil‐atmosphere exchange of CH4 at a large scale is a critical step to improve the CH4 flux ...
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 ...
Papanin Ridge and Ojin Rise Seamounts (Northwest Pacific): Dual Hotspot Tracks Formed by the Shatsky Plume
(
- Geochemistry, Geophysics, Geosystems
, 2021-09-15)
Although previous findings support an origin of the Shatsky Rise igneous plateau (Northwest Pacific) through interaction of a mantle plume with a mid‐ocean ridge triple junction, the evidence for the involvement of a mantle ...
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 ...