Arno Rohrbach
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View article: Depth-dependent anisotropy in the Earth’s inner core linked to chemical stratification
Depth-dependent anisotropy in the Earth’s inner core linked to chemical stratification Open
Seismic anisotropy in the Earth’s inner core (IC), including the heterogeneous, depth-dependent anisotropy structure, is a well-documented yet poorly understood feature plausibly related to the alignment of iron alloy crystals. Here, we re…
View article: Experimentally determined melting and phase relations in a volatile bearing mica-pyroxenite system – implications for mantle metasomatism and alkaline volcanism. 
Experimentally determined melting and phase relations in a volatile bearing mica-pyroxenite system – implications for mantle metasomatism and alkaline volcanism.  Open
Heterogeneous assemblages within the lithospheric mantle represent some of the most enriched domains within the earth for alkaline, rare-earth and volatile elements. Volatile-rich mica-bearing pyroxenites are among these assemblages and we…
View article: Origin of the depth-dependent anisotropy in the Earth’s inner core
Origin of the depth-dependent anisotropy in the Earth’s inner core Open
The understanding of the origin of seismic anisotropy in the Earth’s inner core (IC) remains a subject of debate and requires examining the deformation behavior of potential core materials. In this research, we investigated the effect of s…
View article: Accretion and Core Formation of Earth-like Planets: Insights from Metal–Silicate Partitioning of Siderophile and Volatile Elements
Accretion and Core Formation of Earth-like Planets: Insights from Metal–Silicate Partitioning of Siderophile and Volatile Elements Open
The origin of volatile elements, the timing of their accretion and their distribution during Earth’s differentiation are fundamental aspects of Earth’s early evolution. Here, we present the result of a newly developed accretion and core fo…
View article: Experimental Constraints on the Origin of the Lunar High‐Ti Basalts
Experimental Constraints on the Origin of the Lunar High‐Ti Basalts Open
High‐pressure and high‐temperature experiments were conducted to simulate melting of a hybrid cumulate lunar mantle. The experimental results show that intermediate to high‐Ti lunar pyroclastic glasses (>6 wt% TiO 2 ) can be produced by pa…
View article: Resolving the origin of lunar high-Ti basalts by petrologic experiments
Resolving the origin of lunar high-Ti basalts by petrologic experiments Open
The origin of the most primitive, picritic lunar basalts, sampled as pyroclastic glass beads in the lunar soils [1,2], remains poorly constrained. Especially the petrogenesis of high-Ti glasses (TiO2 > 6 wt%) seems enigmatic. Three hypothe…
View article: Thermal Stability of F‐Rich Phlogopite and K‐Richterite During Partial Melting of Metasomatized Mantle Peridotite With Implications for Deep Earth Volatile Cycles
Thermal Stability of F‐Rich Phlogopite and K‐Richterite During Partial Melting of Metasomatized Mantle Peridotite With Implications for Deep Earth Volatile Cycles Open
Phlogopite and K‐richterite constitute important carrier phases for H and F in Earth's lithosphere and mantle. The relative importance depends on their stabilities at high pressure and temperature, which in turn depends on bulk composition…
View article: The Fe(Ni)–C–N-phase diagram at 10 GPa—implications for nitrogen and carbon storage in the deep mantle
The Fe(Ni)–C–N-phase diagram at 10 GPa—implications for nitrogen and carbon storage in the deep mantle Open
Nitrogen is the most abundant element in the Earth's atmosphere, yet its geochemical behavior and distribution among the various reservoirs (atmosphere, crust, mantle, and core) remain poorly understood. Although estimates of N and C fluxe…
View article: High-pressure melting in metapelites of a 2 Ga old subducted oceanic crust (Usagaran belt, Tanzania): implications from melt inclusions, fluid inclusions and thermodynamic modelling
High-pressure melting in metapelites of a 2 Ga old subducted oceanic crust (Usagaran belt, Tanzania): implications from melt inclusions, fluid inclusions and thermodynamic modelling Open
Investigation of polymineralic melt inclusions preserved in garnet of eclogite-facies metapelites of the Usagaran belt, Tanzania, is of particular importance as these metapelites, intercalated in oceanic metabasites, document the rare case…
View article: Strength and anisotropy of hexagonal Fe-Si-C alloy in planetary cores
Strength and anisotropy of hexagonal Fe-Si-C alloy in planetary cores Open
The observed density of planetary cores is lower than in pure iron-nickel alloy at corresponding conditions. Therefore, the cores of terrestrial planets should be composed of iron-nickel alloyed with some lighter elements. These elements s…
View article: An experimental study on the role of volatiles on the solidus and melting relations of amphibole- and mica-bearing peridotites.
An experimental study on the role of volatiles on the solidus and melting relations of amphibole- and mica-bearing peridotites. Open
Partial melting of peridotite lithologies is responsible for much of the chemical heterogeneity and compositional evolution of lithospheric mantle [1].To that end the role of volatile elements are crucial in promoting melting and thus in m…
View article: Pyroxene/melt partition coefficients and their impact on models of Lunar Magma Ocean evolution
Pyroxene/melt partition coefficients and their impact on models of Lunar Magma Ocean evolution Open
Partition coefficients (D) are not constant values but depend on temperature, pressure, redox conditions, and on the chemical composition of the liquid and the solid [1,2].Recent computational models of the chemical evolution of the Lunar …
View article: Preferential mobilisation of oxidised iron by slab-derived hydrous silicate melts
Preferential mobilisation of oxidised iron by slab-derived hydrous silicate melts Open
Arc magmas are characterised by a higher oxidation degree than magmas from other tectonic settings, including mid-oceanic ridge and ocean arc basalts [1].The oxidised signature is thought to arise from the influx of oxidising slab-derived …
View article: Textures Induced by the Coesite‐Stishovite Transition and Implications for the Visibility of the X‐Discontinuity
Textures Induced by the Coesite‐Stishovite Transition and Implications for the Visibility of the X‐Discontinuity Open
The coesite‐stishovite phase transition is considered the most plausible candidate to explain the X‐discontinuity observed at around 300 km depth in a variety of tectonic settings. Here, we investigate the microstructure in SiO 2 across th…
View article: The stability of antigorite in subduction zones revisited: the effect of F on antigorite stability and its breakdown reactions at high pressures and high temperatures, with implications for the geochemical cycles of halogens
The stability of antigorite in subduction zones revisited: the effect of F on antigorite stability and its breakdown reactions at high pressures and high temperatures, with implications for the geochemical cycles of halogens Open
We present new experimental data on the effect of F on the stability of antigorite and its breakdown products at high pressures (2–6 GPa) and high temperatures (570–850 °C). The experiments show that F does not affect the stability of anti…
View article: Iron mobility in slab-derived hydrous silicate melts at sub-arc conditions
Iron mobility in slab-derived hydrous silicate melts at sub-arc conditions Open
<p>Aqueous and saline fluids have a fundamental role in subduction zones and represent a major vector of mass transfer from the slab to the mantle wedge. In this setting, assessing the mobility of redox sensitive elements, such as ir…
View article: Natural Fe-bearing aluminous bridgmanite in the Katol L6 chondrite
Natural Fe-bearing aluminous bridgmanite in the Katol L6 chondrite Open
Significance Bridgmanite is the most volumetrically abundant mineral of the Earth’s interior, and it is important to understand its formation mechanism to better comprehend the origin and evolution of planetary interiors. Natural bridgmani…
View article: Minimal Dentinal Tubule Penetration of Endodontic Sealers in Warm Vertical Compaction by Direct Detection via SEM Analysis
Minimal Dentinal Tubule Penetration of Endodontic Sealers in Warm Vertical Compaction by Direct Detection via SEM Analysis Open
Sealer staining using rhodamine B dye to investigate the penetration depth of endodontic sealers was proven unsuitable for this purpose. This study aimed to investigate the sealer penetration depth into dentinal tubules by scanning electro…
View article: Debunking the Concept of Dentinal Tubule Penetration of Endodontic Sealers: Sealer Staining with Rhodamine B Fluorescent Dye Is an Inadequate Method
Debunking the Concept of Dentinal Tubule Penetration of Endodontic Sealers: Sealer Staining with Rhodamine B Fluorescent Dye Is an Inadequate Method Open
The aim of this study was to investigate the suitability of rhodamine B dye staining of an epoxy resin sealer (AH Plus) and calcium-silicate-based sealers (Total Fill BC Sealer, BioRoot RCS) to represent the penetration depth of the sealer…
View article: A hydrothermal apparatus for x-ray absorption spectroscopy of hydrothermal fluids at DESY
A hydrothermal apparatus for x-ray absorption spectroscopy of hydrothermal fluids at DESY Open
We present a new autoclave that enables in situ characterization of hydrothermal fluids at high pressures and high temperatures at synchrotron x-ray radiation sources. The autoclave has been specifically designed to enable x-ray absorption…
View article: Replication Data for: An Improved Electron Microprobe Method for the Analysis of Halogens in Natural Silicate Glasses
Replication Data for: An Improved Electron Microprobe Method for the Analysis of Halogens in Natural Silicate Glasses Open
We present a new analytical method, which allows the simultaneous analysis of fluorine (F), chlorine (Cl), bromine (Br), and iodine (I) in geological samples. To account for interferences of Fe on the spectral lines of F, of Al on Br-lines…
View article: An Improved Electron Microprobe Method for the Analysis of Halogens in Natural Silicate Glasses – CORRIGENDUM
An Improved Electron Microprobe Method for the Analysis of Halogens in Natural Silicate Glasses – CORRIGENDUM Open
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View article: The fate of sulfur and chalcophile elements during crystallization of the lunar magma ocean
The fate of sulfur and chalcophile elements during crystallization of the lunar magma ocean Open
Compiled electron microprobe, LA-ICP-MS analyses of experimental run products and additional supporting information, including a online calculator for the SCSS and sulfide-silicate D values.