A5001166887- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Crystallization and Solubility Studies
- Nuclear materials and radiation effects
- X-ray Diffraction in Crystallography
- Advanced ceramic materials synthesis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geological Studies and Exploration
- Crystal Structures and Properties
- Microwave Dielectric Ceramics Synthesis
- Geological and Geophysical Studies
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Advanced X-ray and CT Imaging
- Inorganic Chemistry and Materials
- Boron and Carbon Nanomaterials Research
- Nuclear Physics and Applications
- Grouting, Rheology, and Soil Mechanics
- Metal Extraction and Bioleaching
- Luminescence Properties of Advanced Materials
- Water management and technologies
- Minerals Flotation and Separation Techniques
- Mining Techniques and Economics
- Geochemistry and Elemental Analysis
Baker Hughes (Germany)
2024
University of Freiburg
2020-2023
Leibniz University Hannover
2015-2020
University of Tasmania
2016-2017
SGL Carbon (Germany)
1995
Cumulate rocks of the Upper Main Zone and (UUMZ) Bushveld Complex, South Africa, contain world's major resources Fe–Ti–V ± P, hosted in Ti-magnetite apatite, are commonly considered as having crystallized from last injection magma into chamber. In this study, we present petrography, modal proportions, whole-rock element chemistry (260 samples), electron microprobe data (∼10 000 analyses for plagioclase, olivine, pyroxene), compiled Cr magnetite (239 samples) UUMZ sampled over 2·1 km...
The Chicxulub impact event at ca. 66 Ma left in its wake the only complex crater on Earth with a preserved peak ring, characterized by well-developed magnetic anomaly low. To date, little is known about properties. joint Integrated Ocean Drilling Program (IODP) and International Continental Scientific (ICDP) Expedition 364 drill core M0077A revealed that ring consists of uplifted strongly deformed granitoid basement rocks overlain 130-m-thick melt suevite layer. Pre- postimpact hydrothermal...
The Bushveld Complex in South Africa is the largest layered intrusion on Earth.Its upper part known for huge resources of iron, titanium, vanadium and phosphorus.Associated with character rocks, these are enriched at certain levels intrusion, which makes it important to understand formation processes those layers.In this paper we give an introduction overview recent debates challenges.
A mineral intermediate between sillimanite and mullite, tentatively designated as “sillimullite,” was studied by electron microprobe analyses single-crystal X‑ray diffraction methods. The chemical compositions derived from the results crystal-structure refinement are Al7.84Fe0.18 Ti0.03Mg0.03Si3.92O19.96 Al8.28Fe0.20Si3.52O19.76 (Fe is Fe3+) corresponding to x-values of 0.02 0.12, respectively, in solid-solution series Al8+4xSi4-4xO20-2x assigning Fe3+, Ti, Mg Al site. composition analysis...
A crystal of BaCaBO3F was grown by the Czochralski method. It shows a phase transition at 242.7 °C upon cooling where hexagonal high-temperature modification is transformed to monoclinic low-temperature form (space group C2, = 17.8779(8) Å, b 9.0596(4) c 12.9735(5) β 118.875(13)°, V 1840.03(22) Å3, Z 18). The has symmetry lowered an index 18 relative supergroup. This represents higher than rhombohedral model which 36 lower determined in previous study (Li and Zeng, J. Cryst. Growth 2013,...
Abstract. The Black Forest hosts a wide range of hydrothermal mineralization, including fluorite–barite vein deposits. In detailed investigation the Finstergrund and Tannenboden deposits in Wieden mining district (southern Forest), diversity, geochemical evolution relative chronology multistage fluorite precipitation is tracked on basis rare earth element (REE) geochemistry, geologic field relationships crystal zoning. Geochemical discrimination mathematical λ coefficients suggest total...
Abstract. A single crystal (∼ 20 µm × 330 µm) of mullite-2c, a natural polytype mullite, was separated from radially grown cluster acicular crystals Ettringer Bellerberg (Quarternary Eifel volcanic fields, Germany). The chemical composition determined electron microprobe analysis (EMPA) is Na0.01Mg0.05Al8.52Fe0.293+Si3.13Ti0.02O19.55, corresponding to x=0.22(8) in the generalised mineral formula My+Mgz2+M8+4x+y-2z3+M4-4x-y+z4+O20-2x. Only Fe3+ as foreign cation considered refined structure...
Abstract Single crystals of ABW-type CsAlTiO 4 ( CAT ), CsFeTiO CFT CsGaTiO CGT and ANA-type CsTi 1.1 Si 1.9 O 6.5 CST ) were grown characterized by electron microprobe analyses, single-crystal X-ray diffraction, thermal spindle-stage optical investigations to determine the electronic polarizability 4-coordinated Ti 4+ , α [4] ). The crystal structure was confirmed crystallize in highest possible topological symmetry Imma a = 8.9677(2) Å, b 5.7322(1) c 9.9612(3) Å) with tetrahedrally...
Abstract X-Ray fluorescence (XRF) analysis is a common technique to obtain the elemental composition of geological samples and frequently applied in drill cutting used for e.g., chemostratigraphy, geosteering drilling optimization. This often requires application at rig site delivery high quality, near-real time data. The overall from sample catching data can be reduced or extended depending on preparation procedure. Traditionally, are powdered prepared as pressed pellets. However, this...
Abstract Single crystals of five (Al,Ge)-mullites incorporating Pb, and four which also foreign cations (Fe,Cr,Nd,Sm) were grown by flux techniques in a PbO-MoO 3 flux. They characterized scanning electron microscopy, microprobe analyses, single-crystal X-ray diffraction. In addition, the refractive indices mullite containing Nd determined spindle-stage optical investigations. Careful inspection diffraction data revealed that weak superstructure reflections observed all doped violating...