Julian Alfing

I started studying geosciences at the University of Münster in 2014 and received my B.Sc. degree in 2017 with a thesis focused on accessory phases in CI chondrites. During the subsequent M.Sc. studies, I dived into the field of metamorphic and isotope geology. My thesis was focused on (overprinted) cretaceous HP-LT rocks from the Meratus and Luk Ulo Complexes (Borneo and Java) to investigate and further substantiate cretaceous HP-LT metamorphism in central Indonesia using TIMS Rb-Sr geochronology. After receiving my M.Sc. degree in 2020, I started my PhD at Curtin University, Perth, in 2021.

As metamorphic rocks can serve as a primary source of information to constrain P-T conditions of tectonic processes, my PhD focuses on Archean (>2.8 Ga) metamorphic rocks to investigate the P-T-t history and the implications for early Earth’s geodynamic setting(s) and the evolution into a today’s widely accepted theory of plate tectonics. The quantity of deduced thermobaric gradients for metamorphic rocks gradually increases from the Neoarchean throughout the Proterozoic to the Phanerozoic. Contrastingly, only few data are available for rocks older than 2.8 Ga and therefore the possibility to constrain any tectonic regime(s) acting on early Earth is strictly limited. Facing this lack of data, I work on a set of Archean metamorphic rocks from different Archean cratons worldwide to gain new insights into early Earth’s metamorphic history. A multimethod approach will identify the individual rock’s history deducing age data for different minerals and isotopic systems and thermodynamic modelling for P-T estimations in conjunction with conventional thermobarometry methods.