Sebastian Tappe

Potassium isotopes reveal lithospheric control on the evolution of deep-sourced carbonated silicate magmas

Kimberlites and related CO2-rich ultramafic rocks such as aillikites commonly show Nd-Hf isotope decoupling (unradiogenic εHf at a given εNd), attributed to either recycled oceanic slabs or interaction with metasomatized continental lithospheric mantle (CLM). We present potassium...

Evidence from alkaline magmatism for fluorine- and bromine-enriched cratonic mantle roots

The base of cratonic lithospheric mantle (cratonic root) is a key volatile-rich reservoir (e.g., carbon and halogens), formed through long-term metasomatism by deep-derived incipient melts, whose reactivation has been proposed to drive climatic change over the course of Earth his...