Research profile of the workgroup


 

Research profile: Experimental and theoretical petrology und geochemistry


The better understanding of the differentiation processes within the silicate mantle and the crust of the earth or, more generally, terrestrial planets that have persisted to this day are among the primary research interests of the working group. Thus, for example, interaction processes between mineral phases, silicate melts and fluid phases in the micro to nanometer scale or large-scale magma mixing and differentiation processes are studied.
However, the main focus is also on the applied field of mineralogy and materials science. For example, based on the results of simulations of chemical and physical interactions of injected CO2 with circulating saline fluid phases and the storage and bedrock, favorable or unfavorable formation storage properties can be estimated and thus limits for potential CO2 storage rocks or structurally controlled nanocolycrystalline ceramics determined From world market-independent geomaterials and with excellent mechanical properties, they appear to be potentially suitable for replacing economically critical metallic raw materials, which are often required for the production of mechanically highly resistant materials.
In addition, the interest in the formation and evolution of the early Earth and other terrestrial planets and the subsequent interactions between the coexisting phases during the core-shell separation holds.



 

Einige aktuelle Forschungsprojekte

  • physicochemical interactions between coexisting silicate, carbide, sulfide and / or metal phases
    - structural equilibria of iron sulfide melts in partially molten silicate matrix at elevated temperature and pressure conditions
    - Distributional behavior of siderophilic and chalcophilic elements during the early history of planets and planetesimals
    - Fractionation of the platinum group elements during melting processes of the mantle
  • Physico-chemical interactions between coexisting mineral phases, fluids and / or silicate melt
    - Dynamics and kinetics of enamel-fluid-rock interaction
    - Micro- and nanoscale interaction of mineral phases with melting and fluid phases
    - Fluid mineral (rock) and fluid-melt mineral (rock) partition coefficients of fluid-mobile elements.
    The determination of LILE, REE and HFSE distribution coefficients between minerals (mineral parages), fluid phases and melt makes it possible to determine the contributions of the lithological components of the subducted plate (mantle, crust, sediments) and the mantle wedge to the magmatic fluid composition.
    - Ocean Water Basalt (MORB) correlation and consequent elemental enrichment in supercritical hydrothermal systems
  • Physico-chemical interactions between underground CO2, circulating saline solutions and mineral or cement phases of reservoirs and cover rocks
    - Chemical reactions of underground CO2 with the circulating saline solutions and mineral or cement phases of the reservoir rocks
    - Alteration processes of the capstone structure due to the percolation of the CO2-enriched brine
    - Microstructural changes of the storage rocks due to the alteration processes in the pressure and temperature conditions of the underground CO2 storage
    The experimental results provide information on the kinetics of the reactions taking place (fluid fluid, mineral sepa- rate fluid, mineral aggregate fluid) and on the microstructural change of the rock structure as a function of time. The use of these results in computerized process simulations leads to a formulation of favorable or unfavorable formation storage properties and to the definition of limit values ​​for potential CO2 storage rocks.
  • physicochemical interactions between coexisting mineral phases and fluids (including meteoric waters)
    - Crystal chemistry and thermodynamics of environmentally important natural and anthropogenic mineral phases that incorporate toxic elements (especially Se and As)
    These mineral phases (selenites and arsenates) form as products of weathering of natural rock or as mine waste, in contaminated soils, sediments or as atmospheric aerosols. The bioavailability and mobility of the toxic elements in the environment are controlled by their speciation, i. by their structural and chemical characteristics (species) and their properties. In order to predict and estimate this mobility through model calculations, both the thermodynamic characteristics and the crystal chemistry of these mineral phases must be well known.
  • Nano-composite ceramics - tailor-made alternative materials
    - Structurally controlled nano-polycrystalline materials with excellent mechanical properties from geomaterials independent of the world market
    Recent technologies of high pressure technology allow nano-polycrystalline materials, such as e.g. Ceramics, with excellent mechanical properties (high hardness and strength) from common geomaterials (SiO2, Al2O3). Nano-polycrystalline geomaterials are therefore potentially suitable to replace economically critical metallic raw materials, which are often required for the production of mechanically particularly resistant materials.
  • Differentiation processes of basaltic melts with a focus on the genesis of SiO2-rich residual melts
  • 3D analysis of rock structures by micro-X-ray computed tomography
  • High temperature solution and dynamic performance differential calorimetry