A5053215781- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Astro and Planetary Science
- Planetary Science and Exploration
- Geochemistry and Geologic Mapping
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Mineralogy and Gemology Studies
- Paleontology and Stratigraphy of Fossils
- Diamond and Carbon-based Materials Research
- Glass properties and applications
- Crystal Structures and Properties
- Thermal and Kinetic Analysis
- Geotechnical and Geomechanical Engineering
- Dental Radiography and Imaging
- Dental materials and restorations
- Space Exploration and Technology
- Geomagnetism and Paleomagnetism Studies
- Endodontics and Root Canal Treatments
- Advanced materials and composites
- Geological Modeling and Analysis
- Isotope Analysis in Ecology
- Inorganic Fluorides and Related Compounds
University of Münster
2014-2024
Deutsches Elektronen-Synchrotron DESY
2021
GFZ Helmholtz Centre for Geosciences
2021
ETH Zurich
2008-2019
University of Bonn
2007-2011
The uppermost mantle as sampled by xenoliths, peridotite massifs and primitive basaltic melts appears to be relatively oxidized, with oxygen fugacities between the magnetite^wu« stite fayalite^ferrosilite^magnetite equilibria.Whether this range in fugacity is a shallow signature or representative of entire upper still unclear matter debate because regions deeper than 200 km are not well sampled. To constrain redox state mantle, we performed experiments from 1 14 GPa 1220 16508C on model...
Abstract Modeling the behavior of trace elements during lunar magma ocean solidification is important to further our understanding chemical evolution Moon. Lunar models rely on consistent datasets how partition between a silicate melt and coexisting minerals at different pressures, temperatures, redox conditions. Here we report new experimental element coefficients (D) clinopyroxene (cpx), pigeonite, orthopyroxene, plagioclase, olivine (ol), conditions relevant for ocean. The data include D...
Abstract High‐pressure and high‐temperature experiments were conducted to simulate melting of a hybrid cumulate lunar mantle. The experimental results show that intermediate high‐Ti pyroclastic glasses (>6 wt% TiO 2 ) can be produced by partial cumulates. High‐Ti basalts are generated when the ilmenite/clinopyroxene ratios in mantle cumulates between 1/1 4/1, depending on degree melting. presence an urKREEP component strongly influences Al O 3 /CaO melts. provide strong evidence for model...
Heterogeneous assemblages within the lithospheric mantle represent some of most enriched domains earth for alkaline, rare-earth and volatile elements. Volatile-rich mica-bearing pyroxenites are among these were crucial in recognition metasomatism as a process. However much experimental work until recently has focused on four-phase peridotites which largely devoid volatiles (i.e. C, H, N, S) moderately elements like fluorine unless they have been metasomatised. In where peridotite coexist...
Natural moissanite (SiC) is reported from dozens of localities, most commonly ultramafic rocks where it may be associated with diamond and iron silicides. Yet, formation conditions remain in the realm speculation. The key property SiC its extremely reduced nature. We have experimentally equilibrated olivine orthopyroxene at 1300-1700°C, 2 10 GPa, to determine oxygen fugacity C + = O2 buffer (MOOC) equilibrium X Mg coexisting mantle silicates. experiments resulted 0.993-0.998 Calculated...
Research Article| May 01, 2017 The role of F-clinohumite in volatile recycling processes subduction zones Tobias Grützner; Grützner * 1Institut für Mineralogie, Universität Münster, Corrensstrasse 24, 48149 Germany *E-mail: tobias.gruetzner@wwu.de Search for other works by this author on: GSW Google Scholar Stephan Klemme; Klemme Arno Rohrbach; Rohrbach Fernanda Gervasoni; Gervasoni Jasper Berndt Author and Article Information Publisher: Geological Society America Received: 10 Nov 2016...
The aim of this study was to investigate the suitability rhodamine B dye staining an epoxy resin sealer (AH Plus) and calcium-silicate-based sealers (Total Fill BC Sealer, BioRoot RCS) represent penetration depth into dentinal tubules after root canal obturation. In a three-step process, (1) leaching from buffer solution, (2) passive leached tubules, (3) conformity assessed by confocal laser scanning microscopy (CLSM), electron (SEM), in root-canal-filled teeth, were evaluated. Rhodamine...
Carbon-enriched rocky exoplanets have been proposed to occur around dwarf stars as well binary stars, white dwarfs, and pulsars. However, the mineralogical make up of such planets is poorly constrained. We performed high-pressure high-temperature laboratory experiments (P = 1–2 GPa, T 1523–1823 K) on chemical mixtures representative C-enriched based calculations protoplanetary disk compositions. These P-T conditions correspond deep interiors Pluto- Mars-sized upper mantles larger planets....
Abstract
The aim was to evaluate the remineralization potential as well extent of protection against renewed demineralization enamel by hydroxyapatite-containing toothpaste (Karex) in comparison fluoride-containing (Elmex) and fluoride- hydroxyapatite-free (Ajona) control.Fifty-seven samples were obtained from 19 human teeth. Five demarcated surfaces created on each tooth (S0-S4). Four (S1-S4) exposed lactic acid (pH 3) for 8 h (demineralization). S0 left untreated control. S1 solely treated with...
An understanding of the physical properties hydrous magnesium silicate phase D is important for interpretation seismic anomalies observed in subducted slabs and to evaluate effect hydration on slab dynamics. Here we report equation state (Mg 1.1 Si 1.8 H 2.5 O 6 ) up 65 GPa obtained from high‐precision single‐crystal X‐ray diffraction. A was loaded a diamond anvil cell using helium as pressure transmitting medium ensure quasi‐hydrostatic conditions during entire data collection. The volume...