Janne Koornneef is an isotope geochemist studying the composition of the Earth’s mantle and the volcanic rocks derived from it. She aims to understand the processes that control the compositional variability of lavas and has a specific interest in melt- and fluid related processes within the mantle. She uses multiple isotope systems (U-series, Nd, Sr, Hf, Pb) in combination with major- and trace element chemistry of mantle and volcanic rocks to look at: (1) mantle melting rates and melt transport times (2) the influence of source heterogeneity on the melting process and lava compositions; (3) Recycling fluxes in subduction zones (4) mantle metasomatism and diamond formation processes in subcratonic mantle.

Projects

As a post-doc Janne worked on technique development using the latest generation mass spectrometer (TRITON-Plus TIMS) to measure small geological samples for their Sr, Nd and Pb isotope compositions. In collaboration with the manufacturer of the instrument she developed techniques to use the latest design 10¹² and new 10¹³ Ohm feedback resistors that lead to a significant improvement in signal to noise ratios and therefore precision. She established the benefit of the now commercially available 10¹³ Ohm amplifiers over default 10¹¹ Ohm amplifiers in multiple applications of small sample analyses (mineral inclusions in diamonds, melt inclusions in olivine, dust from ice cores etc). She supervises multiple PhD and MSc students in their research projects to apply the techniques to analyse sub ng samples. 

She is PI of the ERC-STG funded project "ReVolusions" that aims to Quantify Recycling fluxes of Earth surface materials and Volatiles in subduction zones by use of melt inclusions and co-PI in the Europlanet programme (www.europlanet-2020-ri.eu/) that will be relaunched in Feb 2020 (Europlanet 2024 RI).

Visit her personal website at: jannekoornneef.nl

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