Projects
Geological processes occur in and on the Earth over a range of timescales that form a nested, hierarchical structure. Determining the durations of processes that occur on the shorter end of this time-spectrum has been a challenge. The tools of diffusion chronometry have emerged as a very promising method to provide solutions in many situations.
High temperature magmatic systems provide an excellent natural laboratory for developing and calibrating these tools because various kinds of observations from monitoring volcanoes are able to provide cross checks on the results. Subsequently, the newly developed and refined tools may then be applied to a much wider range of geological and planetary settings.
This project aims to bring together field geologists, experimental scientists, theoreticians and modellers from geosciences as well as neighbouring fields of physics and materials science to advance this development. Some of the main objectives of the current phase of the proposal for this research unit are: the measurement of missing diffusion parameters in some critical systems such as pyroxenes and plagioclase, exploring the recently discovered role of isotopic fractionation at high temperatures due to diffusion, calibrating phase relations to enable the setting of boundary and initial conditions in high resolution diffusion models and exploring the role of textural evolution. These will be accompanied by the development of user-friendly codes and other tools that incorporate the advances. The developed tools will be tested in different field settings.
Project #1
Diffusion in common mineral phases. Part 1: pyroxene
Project #2
Diffusion in common mineral phases. Part 2: plagioclase
Project #3
Diffusion-driven Fe-Mg and Li isotope fractionation in olivine: An experimental investigation and new modeling approach
Project #4
Phase stability fields in calc-alkaline magmatic systems and textural evolution of crystalline aggregates
Project #5
Application of phase-field simulation of solidification and texture evolution to diffusion chronometry
Project #6
User friendly codes for the generalized application of diffusion chronometry
Project #7
Chronometry in plutonic rocks: cooling rates of ancient oceanic crust
Central Administration
Sumit Chakraborty, Ruhr-Universitaet Bochum, Spokesperson of the Research Unit
Linda Sobolewski, Ruhr-Universitaet Bochum, Scientific Coordinator