Katherine Freeman
Research Summary
Carbon, water and climate; biomarkers of ancient landscapes; fire markers; habitats of early humans; microbial biogeochemistry and biosignatures; oil, microbes and sediments in the Gulf of Mexico; and Pico-CSIA and early life of Earth.
In the News
Research Keywords
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Projects
Recent Publications
Multiple formation pathways for amino acids in the early Solar System based on carbon and nitrogen isotopes in asteroid Bennu samples
Baczynski, A. A., McIntosh, O. M., Simkus, D. N., McLain, H. L., Dworkin, J. P., Glavin, D. P., Elsila, J. E., Matney, M., House, C. H., Freeman, K. H., Connolly, H. C. & Lauretta, D. S., Feb 24 2026, In: Proceedings of the National Academy of Sciences of the United States of America. 123, 8, e2517723123.Research output: Contribution to journal › Article › peer-review
Metabolic flux controls on carbon isotope patterns in algal lipids
Drozd, J. K., Mueller, E. P. & Freeman, K. H., Jul 2026, In: Organic Geochemistry. 217, 105190.Research output: Contribution to journal › Article › peer-review
Introduction
Freeman, K. H. & Jeanloz, R., 2026, In: Annual Review of Earth and Planetary Sciences. 54, 1, p. i-ivResearch output: Contribution to journal › Editorial › peer-review
Initial results from a Trans-Amazon Drilling Project core from the Acre Basin of Brazil
Fritz, S. C., Sawakuchi, A. O., Noren, A., Baker, P. A., Silva, C., Jaramillo, C., de Almeida, R. P., Janikian, L., Bezerra, I. S., Barbosa, M., Bertassoli, D., Blankenship, R., Chiessi, C. M., Feakins, S. J., Garcia, M. D. G., Gautheron, C., Grivna, B., Hartmann, G., Kunkel, C. & Marconato, A. & 70 others, , Jun 26 2026, In: Scientific Drilling. 35, 1, p. 127-157 31 p.Research output: Contribution to journal › Article › peer-review
Confirmation of Δ2-sterenes as precursors of 3-methylsteranes
Hartke, E. R., Freeman, K. H., Macalady, J. L., He, R. & Brassell, S. C., Oct 2026, In: Organic Geochemistry. 220, 105231.Research output: Contribution to journal › Article › peer-review
Holocene Paleolake Evolution of the Bribir–Ostrovica Karst Polje (Dalmatia, Croatia): A Multi-Proxy Lake Sediment Record
Ilijanić, N., Ivkić Filipović, I., Miko, S., Hajek-Tadesse, V., Šparica Miko, M., McClure, S. B., Kennett, D. J., Hartke, E., Freeman, K. H., Sladović, Ž. & Podrug, E., Aug 2026, In: Quaternary. 9, 4, 48.Research output: Contribution to journal › Article › peer-review
Intramolecular carbon isotope fractionations of acetate associated with glucose metabolism in Escherichia coli using gas chromatography orbitrap-mass spectrometry (GC Orbitrap-MS)
Sato, Y. J., Drozd, J. K., Mueller, E. P., Baczynski, A. A., Gilbert, A. & Freeman, K. H., Oct 2026, In: Organic Geochemistry. 220, 105245.Research output: Contribution to journal › Article › peer-review
Temperature Sensitivity of Leaf Wax n-Alkane Carbon Isotopes: Mechanisms and Implications for Terrestrial Paleoclimates
Xie, H., Lloyd, M. K., Baczynski, A. A., Diefendorf, A. F. & Freeman, K. H., Feb 16 2026, In: Geophysical Research Letters. 53, 3, e2025GL119656.Research output: Contribution to journal › Letter › peer-review
Introduction
Freeman, K. H. & Jeanloz, R., May 30 2025, In: Annual Review of Earth and Planetary Sciences. 53, 1, p. v-viiiResearch output: Contribution to journal › Editorial › peer-review
Abundant ammonia and nitrogen-rich soluble organic matter in samples from asteroid (101955) Bennu
Glavin, D. P., Dworkin, J. P., Alexander, C. M. O. D., Aponte, J. C., Baczynski, A. A., Barnes, J. J., Bechtel, H. A., Berger, E. L., Burton, A. S., Caselli, P., Chung, A. H., Clemett, S. J., Cody, G. D., Dominguez, G., Elsila, J. E., Farnsworth, K. K., Foustoukos, D. I., Freeman, K. H., Furukawa, Y. & Gainsforth, Z. & 42 others, , Feb 2025, In: Nature Astronomy. 9, 2, p. 199-210 12 p.Research output: Contribution to journal › Article › peer-review
Corrigendum to “Fire distinguishers: Refined interpretations of polycyclic aromatic hydrocarbons for paleo-applications” [Geochimica et Cosmochimica Acta 289 (2020) 93–113, (S001670372030541X), (10.1016/j.gca.2020.08.024)]
Karp, A. T., Holman, A. I., Hopper, P., Grice, K. & Freeman, K. H., Apr 15 2025, In: Geochimica et Cosmochimica Acta. 395, p. 277-278 2 p.Research output: Contribution to journal › Comment/debate › peer-review
Stable Nitrogen Isotope Analysis of Amino Acids by Orbitrap Mass Spectrometry: Application for Extraterrestrial Samples
McIntosh, O. M., Baczynski, A. A., Matney, M., McLain, H. L., Farnsworth, K. K., Dworkin, J. P., Glavin, D. P., Elsila, J. E., Xie, H. & Freeman, K. H., Dec 15 2025, In: Rapid Communications in Mass Spectrometry. 39, 23, e10127.Research output: Contribution to journal › Article › peer-review
Molecular Average and Intramolecular δ13C Measurements of Pyruvic Acid and Acetic Acid Using Gas Chromatography Orbitrap Mass Spectrometry (GC Orbitrap-MS)
Sato, Y. J., Baczynski, A. A., Xie, H., Gilbert, A. & Freeman, K. H., Sep 9 2025, In: Analytical Chemistry. 97, 35, p. 19047-19056 10 p.Research output: Contribution to journal › Article › peer-review
Introduction
Freeman, K. H. & Jeanloz, R., Jul 23 2024, In: Annual Review of Earth and Planetary Sciences. 52, 1, p. V-VIIResearch output: Contribution to journal › Editorial › peer-review
Spatial and Temporal Patterns in Petrogenic Organic Carbon Mobilization During the Paleocene-Eocene Thermal Maximum
Hollingsworth, E. H., Elling, F. J., Badger, M. P. S., Pancost, R. D., Dickson, A. J., Rees-Owen, R. L., Papadomanolaki, N. M., Pearson, A., Sluijs, A., Freeman, K. H., Baczynski, A. A., Foster, G. L., Whiteside, J. H. & Inglis, G. N., Feb 2024, In: Paleoceanography and Paleoclimatology. 39, 2, e2023PA004773.Research output: Contribution to journal › Article › peer-review
