Research Foci
- Hf-W chronometry of early solar system materials
- Tellurium stable isotope fractionation in extraterrestrial and terrestrial samples
- Nucleosynthetic (Ti, Cr) isotope anomalies in meteorites
CV
Academic Education
- Doctor of Natural Sciences (Dr. rer. nat.) - Cosmochemistry and Isotope Geochemistry, University of Münster
- Master of Science (M.Sc.) - Geosciences/Earth Sciences, University of Münster
- Bachelor of Science (B.Sc.) - Geosciences/Earth Sciences, University of Münster
Positions
- Postdoctoral Researcher, Institute for Planetology, University of Münster
- Research assistant (doctoral student), Institute for Planetology, University of Münster
- Student assistant, Institute for Planetology, University of Münster
Honors
- Paul Pellas - Graham Ryder Award in the category Best Student Paper in Planetary Sciences – The Meteoritical Society
- Outstanding Student Presentation Award in the category Planetary Sciences – American Geophysical Union (AGU)
- Wiley Award – McKay Award Committee of The Meteoritical Society
External Functions
- German Mineralogical Society
- Meteoritical Society
- European Association of Geochemistry
Project
- CRC TRR 170 - B02: Stable isotope fractionation of S, Te and Pd and the roles of core formation and late accretion on siderophile volatile elements in the Earth ( – )
Subproject in DFG-Joint Project Hosted outside the University of Münster: DFG - Collaborative Research Centre | Project Number: TRR 170/1
- CRC TRR 170 - B02: Stable isotope fractionation of S, Te and Pd and the roles of core formation and late accretion on siderophile volatile elements in the Earth ( – )
Publications
- Renggli, CJ, Hellmann, JL, Burkhardt, C, Klemme, S, Berndt, J, Pangritz, P, and Kleine, T. . “Tellurium isotope fractionation during evaporation from silicate melts.” Geochimica et Cosmochimica Acta, № 339: 35–45. doi: 10.1016/j.gca.2022.10.032.
- Bischoff A, Alexander C M O'D, Burkhardt C, Busemann H, Degering D, DiRocco T, Fischer M, Fockenberg T, Foustoukos D I, Gattacceca J, Godinho J R A, Harries D, Heinlein D, Hellmann J L, Hertkorn N, Holm A, Jull A J T, Kerraouch I, King A J, Kleine T, Koll D, Lachner J, Ludwig T, Merchel S, Mertens C A K, Morino P, Neumann W, Pack A, Patzek M, Pavetich S, Reitze M P, Rüfenacht M, Rugel G, Schmidt C, Schmitt-kopplin O, Schönbächler M, Trieloff M, Wallner A, and Wimmer K, Wölfer E. . “The old, unique C1 chondrite Flensburg–insight into the first processes of aqueous alteration, brecciation, and the diversity of water-bearing parent bodies and lithologies.” Geochimica et Cosmochimica Acta, № 293: 142–186. doi: 10.1016/j.gca.2020.10.014.
- Metzler, K, Hezel, DC, Barosch, J, Wölfer, E, Schneider, JM, Hellmann, JL, Berndt, J, Stracke, A, Gattacceca, J, Greenwood, RC, Franchi, IA, Burkhardt, C, and Kleine, T. . “The Loongana (CL) group of carbonaceous chondrites.” Geochimica et Cosmochimica Acta, № 304: 1–31. doi: 10.1016/j.gca.2021.04.007.
- Hellmann, JL, Hopp, T, Burkhardt, C, Becker, H, Fischer-Gödde, M, and Kleine, T. . “Tellurium isotope cosmochemistry: Implications for volatile fractionation in chondrite parent bodies and origin of the late veneer.” Geochimica et Cosmochimica Acta, № 309: 313–328. doi: 10.1016/j.gca.2021.06.038.
- Hellmann, JL, Kruijer, TS, Metzler, K, Patzek, M, Pack, A, Berndt, J, and Kleine, T. . “Hf-W chronology of a macrochondrule from the L5/6 chondrite Northwest Africa 8192.” Meteoritics and Planetary Science, № 55 (10): 2241–2255. doi: 10.1111/maps.13571.
- Hellmann, JL, Hopp, T, Burkhardt, C, and Kleine, T. . “Origin of volatile element depletion among carbonaceous chondrites.” Earth and Planetary Science Letters, № 549: 116508. doi: 10.1016/j.epsl.2020.116508.
- Hellmann, JL, Kruijer, TS, Van Orman, JA, Metzler, K, and Kleine, T. . “Hf-W chronology of ordinary chondrites.” Geochimica et Cosmochimica Acta, № 258: 290–309. doi: 10.1016/j.gca.2019.05.040.
- Archer, GJ, Walker, RJ, Tino, J, Blackburn, T, Kruijer, TS, and Hellmann, JL. . “Siderophile element constraints on the thermal history of the H chondrite parent body.” Geochimica et Cosmochimica Acta, № 245: 556–576. doi: 10.1016/j.gca.2018.11.012.
- Kleine, T, Budde, G, Hellmann, JL, Kruijer, TS, and Burkhardt, C. . “Tungsten isotopes and the origin of chondrules and chondrites.” in Chondrules: Records of Protoplanetary Disk Processes, edited by SS Russell, Jr.H C Connolly and AN Krot. Cambridge: Cambridge University Press. doi: 10.1017/9781108284073.010.
