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Hf-W chronometry, Tellurium stable isotopes, Volatile element fractionation
Germany, United States

Biography

I have a strong interest in deepening our understanding of the formation and evolution of the early Solar System, as well as the accretion and differentiation history of Earth. In particular, my research aims to address the questions:

What were the dominant mixing and fractionation processes in the earliest stages of Solar System history, and what is the chronology of these events?
What are the formation and thermal evolution paths of asteroids and their precursors?
How, when, and where did planetary building blocks accrete to form Earth and other planetary bodies?
What is the geochemical evolution of Earth’s crust and mantle?

To elucidate these questions, I search for isotopic variations and chemical signatures in meteorites and their components, as well as in terrestrial rocks. Specifically, I combine radiometric dating (chronology), mass-independent isotope anomalies of nucleosynthetic origin (tracers of the genetic heritage), and elemental and mass-dependent isotope fractionations (tracers of kinetic and equilibrium processes) to address when, where, and how nebular and planetary processes took place.

Activities

Employment (5)

Max Planck Institute for Solar System Research: Göttingen, DE

2024-03-15 to present | Scientist (Planetary Science)
Employment
Source: Self-asserted source
Jan L. Hellmann

University of Maryland: College Park, US

2021-09-01 to 2024-03-14 | Post-Doctoral Associate (Department of Geology)
Employment
Source: Self-asserted source
Jan L. Hellmann

University of Münster: Münster, DE

2020-12-01 to 2021-08-31 | Postdoc (Institute for Planetolgy)
Employment
Source: Self-asserted source
Jan L. Hellmann

University of Münster: Münster, DE

2016-12-01 to 2020-11-30 | Research Assistant (Institute for Planetology)
Employment
Source: Self-asserted source
Jan L. Hellmann

University of Münster: Münster, DE

2014 to 2016 | Student Assistant (Institute for Planetology)
Employment
Source: Self-asserted source
Jan L. Hellmann

Education and qualifications (3)

University of Münster: Münster, DE

2016 to 2020 | Dr. rer. nat. (Institute for Planetology)
Qualification
Source: Self-asserted source
Jan L. Hellmann

University of Münster: Münster, DE

2014 to 2016 | M.Sc. (Institute for Planetology)
Education
Source: Self-asserted source
Jan L. Hellmann

University of Münster: Münster, DE

2011 to 2014 | B.Sc.
Education
Source: Self-asserted source
Jan L. Hellmann

Works (17)

Bulk silicate Earth-like 142Nd and 182W mantle component sampled by 2.0 Ga Onega Basin picrites, Fennoscandia

Geochimica et Cosmochimica Acta
2025-01 | Journal article
Contributors: I.S. Puchtel; J.L. Hellmann; H. Rizo; J. Blichert-Toft; A.V. Stepanova; A.V. Samsonov; R.J. Walker
Source: check_circle
Crossref

Hf-W isotope systematics of enstatite chondrites: Parent body chronology and origin of Hf-W fractionations among chondritic meteorites

Earth and Planetary Science Letters
2024 | Journal article
EID:

2-s2.0-85180401086

Part of ISSN: 0012821X
Contributors: Hellmann, J.L.; Van Orman, J.A.; Kleine, T.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier

Hf–W isotope systematics of bulk chondrites: Implications for early Solar System evolution

Geochimica et Cosmochimica Acta
2024-12 | Journal article
Contributors: Jan L. Hellmann; Gerrit Budde; Lori N. Willhite; Richard J. Walker
Source: check_circle
Crossref

<sup>182</sup>W and <sup>187</sup>Os constraints on the origin of siderophile isotopic heterogeneity in the mantle

Geochimica et Cosmochimica Acta
2023 | Journal article
EID:

2-s2.0-85176913436

Part of ISSN: 00167037
Contributors: Walker, R.J.; Mundl-Petermeier, A.; Puchtel, I.S.; Nicklas, R.W.; Hellmann, J.L.; Echeverría, L.M.; Ludwig, K.D.; Bermingham, K.R.; Gazel, E.; Devitre, C.L. et al.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier

Origin of Isotopic Diversity among Carbonaceous Chondrites

Astrophysical Journal Letters
2023 | Journal article
EID:

2-s2.0-85151560996

Part of ISSN: 20418213 20418205
Contributors: Hellmann, J.L.; Schneider, J.M.; Wölfer, E.; Drążkowska, J.; Jansen, C.A.; Hopp, T.; Burkhardt, C.; Kleine, T.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier
grade
Preferred source (of 2)‎

ORIGIN OF ISOTOPIC DIVERSITY AMONG CARBONACEOUS CHONDRITES

arXiv
2023 | Other
EID:

2-s2.0-85150590675

Part of ISSN: 23318422
Contributors: Hellmann, J.L.; Schneider, J.M.; Wölfer, E.; Drążkowska, J.; Jansen, C.A.; Hopp, T.; Burkhardt, C.; Kleine, T.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier

Heterogeneous nature of the carbonaceous chondrite breccia Aguas Zarcas – Cosmochemical characterization and origin of new carbonaceous chondrite lithologies

Geochimica et Cosmochimica Acta
2022 | Journal article
EID:

2-s2.0-85135990521

Part of ISSN: 00167037
Contributors: Kerraouch, I.; Kebukawa, Y.; Bischoff, A.; Zolensky, M.E.; Wölfer, E.; Hellmann, J.L.; Ito, M.; King, A.; Trieloff, M.; Barrat, J.-A. et al.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier

Isotopic evidence for pallasite formation by impact mixing of olivine and metal during the first 10 million years of the Solar System

PNAS Nexus
2022 | Journal article
EID:

2-s2.0-85138277820

Part of ISSN: 27526542
Contributors: Windmill, R.J.; Franchi, I.A.; Hellmann, J.L.; Schneider, J.M.; Spitzer, F.; Kleine, T.; Greenwood, R.C.; Anand, M.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier
grade
Preferred source (of 2)‎

Tellurium isotope fractionation during evaporation from silicate melts

Geochimica et Cosmochimica Acta
2022 | Journal article
EID:

2-s2.0-85141336541

Part of ISSN: 00167037
Contributors: Renggli, C.J.; Hellmann, J.L.; Burkhardt, C.; Klemme, S.; Berndt, J.; Pangritz, P.; Kleine, T.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier
grade
Preferred source (of 2)‎

Tellurium isotope cosmochemistry: Implications for volatile fractionation in chondrite parent bodies and origin of the late veneer

Geochimica et Cosmochimica Acta
2021 | Journal article
EID:

2-s2.0-85111075496

Part of ISSN: 00167037
Contributors: Hellmann, J.L.; Hopp, T.; Burkhardt, C.; Becker, H.; Fischer-Gödde, M.; Kleine, T.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier
grade
Preferred source (of 2)‎

The Loongana (CL) group of carbonaceous chondrites

Geochimica et Cosmochimica Acta
2021 | Journal article
EID:

2-s2.0-85105333746

Part of ISSN: 00167037
Contributors: Metzler, K.; Hezel, D.C.; Barosch, J.; Wölfer, E.; Schneider, J.M.; Hellmann, J.L.; Berndt, J.; Stracke, A.; Gattacceca, J.; Greenwood, R.C. et al.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier
grade
Preferred source (of 2)‎

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
2021-01 | Journal article
Part of ISSN: 0016-7037
Source: Self-asserted source
Jan L. Hellmann
grade
Preferred source (of 2)‎

Hf-W chronology of a macrochondrule from the L5/6 chondrite Northwest Africa 8192

Meteoritics and Planetary Science
2020 | Journal article
EID:

2-s2.0-85091724826

Part of ISSN: 10869379
Contributors: Hellmann, J.L.; Kruijer, T.S.; Metzler, K.; Patzek, M.; Pack, A.; Berndt, J.; Kleine, T.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier
grade
Preferred source (of 2)‎

Origin of volatile element depletion among carbonaceous chondrites

Earth and Planetary Science Letters
2020 | Journal article
EID:

2-s2.0-85089553406

Part of ISSN: 0012821X
Contributors: Hellmann, J.L.; Hopp, T.; Burkhardt, C.; Kleine, T.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier
grade
Preferred source (of 2)‎

Hf-W chronology of ordinary chondrites

Geochimica et Cosmochimica Acta
2019 | Journal article
EID:

2-s2.0-85067360028

Part of ISSN: 00167037
Contributors: Hellmann, J.L.; Kruijer, T.S.; Van Orman, J.A.; Metzler, K.; Kleine, T.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier
grade
Preferred source (of 2)‎

Siderophile element constraints on the thermal history of the H chondrite parent body

Geochimica et Cosmochimica Acta
2019 | Journal article
EID:

2-s2.0-85057838769

Contributors: Archer, G.J.; Walker, R.J.; Tino, J.; Blackburn, T.; Kruijer, T.S.; Hellmann, J.L.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier

Tungsten Isotopes and the Origin of Chondrules and Chondrites

Chondrules: Records of Protoplanetary Disk Processes
2018 | Book chapter
EID:

2-s2.0-85060869289

Contributors: Kleine, T.; Budde, G.; Hellmann, J.L.; Kruijer, T.S.; Burkhardt, C.
Source: Self-asserted source
Jan L. Hellmann via Scopus - Elsevier

Peer review (5 reviews for 3 publications/grants)

Review activity for Geochimica et cosmochimica acta. (3)
Review activity for Journal of geophysical research. (1)
Review activity for Nature astronomy. (1)