Time periods: November – December, 2020; and April 2021 – Present
After defended my PhD thesis on isotope cosmochemistry in Institut de Physique du Globe de Paris, Universite de Paris in France, I work as a Humboldt postdoc fellow in Freie Universität Berlin. I used Cr isotope measurements which valuably include a stable isotope ratio (53Cr/52Cr, to study processes), a radiogenic daughter of 53Mn (53Cr, to study timing) and nucleosynthetic anomalies 54Cr (to study stellar origin). I combine these three approaches by using both thermal ionization mass-spectrometry (TIMS) and multi-collector, inductively coupled plasma mass-spectrometry (MC-ICPMS), unspiked (radiogenic and nucleosynthetic anomalies) and double spiked (stable isotopes).
Currently, I mainly concern the following projects:
- Cr isotopic anomalies in meteorites.
I have measured by both TIMS and MC-ICP-MS the mass-independent Cr isotope variations produced by both radiogenic ingrowths to study the timing (e.g. 53Mn-53Cr chronometry) and nucleosynthetic anomalies to study the origin (54Cr) of primitive meteorites, their main components (chondrules) and planetary bodies (including Earth, Moon, Mars, Angrite, Ureilite, and Aubrite parent bodies).
- Cr stable isotopic compositions (mass-dependent fractionation) in meteorites.
I use an original approach by measuring Cr stable isotope variations (using double spike approach coupled with a MC-ICP-MS) to study the origin of chondrites and volatile loss, magmatic evolution, and core-mantle differentiation of terrestrial planets (Mars, Vesta, Angrite, Ureilite, and Aubrite parent bodies).
- Other isotopic systems.
After my PhD study, I also started to touch the isotopes of other elements. For example, 1) Ni is a siderophile element that can be used to trace the planetary core formation; 2) Ca isotope compositions of chondrites and planets and the implications for their genetic relationships and differentiation.
- Terrestrial samples.
I am also expanding my expertise of isotopes from meteorites to terrestrial samples, including Archean samples, tektites, oceanic island basalts, Fe-Mn nodules and banded iron formation.
- Alexander von Humboldt Fellowship for Postdoc Researcher
- Student Sponsorship from European Association of Geochemistry
- Aide à la MOBILITE INTERNATIONALE des doctorants de l’IPGP
- Richard Norton Award (travel grant in MetSoc 2019)
- Wiley Award (outstanding presentation award in MetSoc 2019)
- Oral Presentation Award in Geoscience Symposium in USTC, 2016
Zhu, K., Moynier, F., Schiller, M., Alexander, C.M.O’D., Barrat, J.-A., Bischoff, A., Bizzarro, M. (2020): Mass-independent and mass-dependent Cr isotopic composition of the Rumuruti (R) chondrites: Implications for their origin and planet formation. Geochim. Cosmochim. Acta, 293, 598–609. Link