Teaching
- Vorlesung und Übungen „Experimental methods in Petrology”
(Ulmer, Rohrbach, Mann, Wohlers) - Übungen zu Baumaterial der Erde
Vollmer, Rohrbach - Vorlesung „Gesteinsbildende Minerale“
(Rohrbach) - „Mikroskopie der gesteinsbildenden Minerale“
(Schmid-Beurmann, John, Rohrbach) - Field camp
(1 wöchig, Harz)
- Vorlesung und Übungen „Experimental methods in Petrology”
Research Foci
- Redox processes in the Earth’s deep mantle
- Volatiles in Earth’s mantle and the deep carbon cycle
- Metal – silicate element partitioning and the formation of Earth’s core
- Improvements in valence state determination using transmission electron microscopy
CV
Academic Education
- Doctoral degree at the Institut für Mineralogie, Westfälische Wilhelms-Universität Münster, Germany. Thesis: The oxidation state of the Earth's asthenosphere; high–pressure experiments and energy–filtered TEM analyses. Advisor: Prof. C. Ballhaus
- Diploma in mineralogy at the Institut für Mineralogie, Westfälische Wilhelms-Universität Münster. Thesis: Petrologische Untersuchungen an Pikriten der Salomonen Inseln (in German).
- Studies in mineralogy, Institut für Mineralogie, Westfälische Wilhelms-Universität Münster, Germany
Positions
- Research Associate (Akademischer Rat), Institut für Mineralogie, Westfälische Wilhelms-Universität Münster
- Junior Professor for analytical petrology at the Institut für Mineralogie, Westfälische Wilhelms-Universität Münster
- Post-doctoral researcher at the Institute of Geochemistry and Petrology, ETH Zürich, Switzerland
- Research assistant (doctoral candidate) at the Westfälische Wilhelms-Universität Münster and Universität Bonn
Honors
- Bernd Rendel Prize – German Research Foundation (DFG)
Projects
- CRC TRR 170 - C01: Experimental constraints on volatile element partitioning during core formation on the terrestrial planets ()
Subproject in DFG-Joint Project Hosted at the University of Münster: DFG - Sonderforschungsbereich | Project Number: TRR 170/2 - CRC TRR 170 - C01: Partitioning of siderophile volatile elements during core formation ()
Subproject in DFG-Joint Project Hosted outside the University of Münster: DFG - Sonderforschungsbereich | Project Number: TRR 170/1 - Redox controls on phase relations and melting in the Earth's upper mantle ()
Own Resources Project - P-T-fO2 stability of reduced phases in the deep mantle: experimental investigations in the system Fe-Ni-C-S ()
Own Resources Project
Publications
- Lanati, AW., Shea, JJ., Foley, SF., Klöcking, M., Rohrbach, A., & Klemme, S. (). The East Australian Potassic Suite: Petrology, Bulk Chemistry, and Origin. Journal of Petrology, 67 (2), Article egag002. doi: 10.1093/petrology/egag002.
- Kolesnikov, E., Li, X., Müller, S., Rohrbach, A., Klemme, S., Berndt, J., H-P, L., Sanchez-Valle, C., & Kupenko, I. (). Depth-dependent anisotropy in the Earth’s inner core linked to chemical stratification,. Nature Communications, 16, Article 10986. doi: 10.1038/s41467-025-67067-y.
- Florin, G., Pangritz, P., Renggli, CJ., Gleißner, P., Berndt, J., Rohrbach, A., Becker, H., & Klemme, S. (). Isotopic fractionation of copper during silicate melt evaporation: effects of sulfur, fO2, and temperature. Geochimica et Cosmochimica Acta, 409, 131–146. doi: 10.1016/j.gca.2025.09.015.
- Steenstra, ES., Klaver, M., Berndt, J., Flemetakis, S., Rohrbach, A., & Klemme, S. (). Thermal Stability of F-rich Phlogopite and K-richterite during Partial Melting of Metasomatized Mantle Peridotite with Implications for Deep Earth Volatile Cycles. Journal of Geophysical Research - Solid Earth, 129 (3), e2023JB0. doi: 10.1029/2023JB028202.
- Haupt, CP., Renggli, CJ., Rohrbach, A., Berndt, J., Schwinger, S., Maurice, M., Schulze, M., Breuer, D., & Klemme, S. (). Trace element partitioning in the lunar magma ocean: an experimental study. Contributions to Mineralogy and Petrology, 179, Article 45. doi: 10.1007/s00410-024-02118-z.
- Haupt, CP., Renggli, CJ., Rohrbach, A., Berndt, J., & Klemme, S. (). Experimental Constraints on the Origin of the Lunar High-Ti Basalts. Journal of Geophysical Research: Planets, 129 (8), Article e2023JE008239. doi: 10.1029/2023JE008239.
- Loroch, D., Hackler, S., Rohrbach, A. B., & Klemme, S. (). Accretion and Core Formation of Earth-like Planets: Insights from Metal–Silicate Partitioning of Siderophile and Volatile Elements. Geosciences, 14, 281. doi: 10.3390/geosciences14110281.
- Liu, Z., Rohrbach, A., Tiraboschi, C., Foley, SF., Berndt, J., & Klemme, S. (). The effect of COH fluids on partial melting of eclogite and lherzolite under moderately oxidizing and reducing conditions. Chemical Geology, 121219. doi: 10.1016/j.chemgeo.2022.121219.
- Tiraboschi, C., McCammon, C., Rohrbach, A., Klemme, S., Berndt, J., & Sanchez-Valle, C. (). Preferential mobilisation of oxidised iron by slab-derived hydrous silicate melts. Geochemical Perspectives Letters, 24, 43–47. doi: 10.7185/geochemlet.2304.
- Haupt, CP., Renggli, CJ., Klaver, M., Steenstra, ES., Berndt, J., Rohrbach, A., & Klemme, S. (). Experimental and petrological investigations into the origin of the lunar Chang'e 5 basalts. Icarus, 402, 15625. doi: 10.1016/j.icarus.2023.115625.
- Herms, P., Raase, P., Giehl, C., Aradi, LE., Fußwinkel, T., Rohrbach, A., & Möller, A. (). High-pressure melting in metapelites of a 2 Ga old subducted oceanic crust (Usagaran belt, Tanzania): implications from melt inclusions, fluid inclusions and thermodynamic modelling. Contributions to Mineralogy and Petrology, 178, Article 84. doi: 10.1007/s00410-023-02063-3.
- Pangritz, P., Rohrbach, A., Vollmer, C., Berndt, J. M., Radic, D., Basten, S., & Klemme, S. (). The Fe(Ni)–C–N‑phase diagram at 10 GPa—implications for nitrogen and carbon storage in the deep mantle. Contributions to Mineralogy and Petrology, 179 (3), 1–14. doi: 10.1007/s00410-023-02084-y.
- Pangritz, P., Renggli, CJ., Berndt, J., Rohrbach, A., & Klemme, S. (). Synthesis of large amounts of volatile element-bearing silicate glasses using a two-stage melting process. ACS Earth and Space Chemistry, 6 (4), 1108–1111. doi: 10.1021/acsearthspacechem.2c00020.
- Flemetakis, S., Tiraboschi, C., Rohrbach, A., Berndt, J., & Klemme, S. (). The stability of antigorite in subduction zones revisited: The effect of F on antigorite stability and its breakdown reactions at high pressures and high temperatures, with implications for the geochemical cycles of halogens. Contributions to Mineralogy and Petrology, 177, 70. doi: 10.1007/s00410-022-01934-5.
- Steenstra, ES., Berndt, J., Rohrbach, A., Bullock, ES., van Westrenen, W., Klemme, S., & Walter, MJ. (). Partitioning of Ru, Pd, Ag, Re, Pt, Ir and Au between sulfide-, metal- and silicate liquid at highly reduced conditions: implications for terrestrial accretion and aubrite parent body evolution. Geochimica et Cosmochimica Acta, 336, 15–32. doi: 10.1016/j.gca.2022.08.021.
- Krug, M., Saki, M., Ledoux, E., Gay, JP., Chantel, J., Pakhomova, A., Husband, R., Rohrbach, A., Klemme, S., Thomas, C., Merkel, S., & Sanchez-Valle, C. (). Textures induced by the coesite-stishovite transition and implications for the visibility of the X-discontinuity. Geochemistry, Geophysics, Geosystems, 23 (10), e2022GC010544. doi: 10.1029/2022GC010544.
- Schmidt, S., Schäfer, E., Bürklein, S., Rohrbach, A., & Donnermeyer, D. (). Minimal Dentinal Tubule Penetration of Endodontic Sealers in Warm Vertical Compaction by Direct Detection via SEM Analysis. Journal of Clinical Medicine, 10 (19), 4440. doi: 10.3390/jcm10194440.
- Donnermeyer, D., Schmidt, S., Rohrbach, A., Berlandi, J., Bürklein, S., & Schäfer, E. (). Debunking the Concept of Dentinal Tubule Penetration of Endodontic Sealers: Sealer Staining with Rhodamine B Fluorescent Dye Is an Inadequate Method. Materials, 14 (12), 3211. doi: 10.3390/ma14123211.
- Flemetakis S, K., Stracke A, G. F., & Berndt J, R. A. (). Constraining the presence of amphibole and mica in metasomatized mantle sources through halogen partitioning experiments. Lithos, 380-381, 105859. doi: 10.1016/j.lithos.2020.105859.
- Klemme, S., Feldhaus, M., Potapkin, V., Wilke, M., Borchert, M., Louvel, M., Loges, A., Rohrbach, A., Weitkamp, P., Welter, E., Kokh, M., Schmidt, C., & Testemale, D. (). A hydrothermal apparatus for X-ray absorption spectroscopy of hydrothermal fluids at DESY. Review of Scientific Instruments, 92, 063903. doi: 10.1063/5.0044767.
- Liu, Z., Shea, J., Foley, SF., Bussweiler, Y., Rohrbach, A., Klemme, S., & Berndt, J. (). Clarifying source assemblages and metasomatic agents for basaltic rocks in eastern Australia using olivine phenocryst compositions. Lithos, 390–391, 106122. doi: 10.1016/j.lithos.2021.106122.
- Ghosh, S., Tiwari, K., Miyahara, M., Rohrbach, A., Vollmer, C., Stagno, V., Ohtani, E., & Ray, D. (). Natural Fe-bearing aluminous bridgmanite in the Katol L6 chondrite. Proceedings of the National Academy of Sciences of the United States of America, 118 (40), e2108736118–. doi: 10.1073/pnas.2108736118.
- Grützner, T., Hopp, T., Berndt, J., Rohrbach, A., & Klemme, S. (). Experimental investigation of Ru isotope fractionation between metal, silicate and sulfide melts. Chemical Geology, 580, 120384. doi: 10.1016/j.chemgeo.2021.120384.
- Rzehak, L. JA., Rohrbach, A., Vollmer, C., Höfer, HE., Berndt, J., & Klemme, S. (). Ferric-ferrous iron ratios of experimental majoritic garnet and clinopyroxene as a function of oxygen fugacity. American Mineralogist, 105, 1866–1874. doi: 10.2138/am-2020-7265.
- Yusenko, KV., Spektor, K., Khandarkhaeva, S., Fedotenko, T., Pakhomova, A., Kupenko, I., Rohrbach, A., Klemme, S., Crichton, WA., Dyachkova, TV., Tyutyunnik, AP., Zainulin, YG., Dubrovinsky, LS., & Gromilov, SA. (). Decomposition of single-source precursors under high-temperature high-pressure to access osmium-platinum refractory alloys. Journal of Alloys and Compounds, 813, 152121. doi: 10.1016/j.jallcom.2019.152121.
- Flemetakis, S., Berndt, J., Klemme, S., Genske, F., Cadoux, A., Louvel, M., & Rohrbach, A. (). Erratum: An improved electron microprobe method for the analysis of halogens in natural silicate glasses (Microscopy and Microanalysis (2020) 26:5 (857-866)). Microscopy and Microanalysis, 26 (5), 1076. doi: 10.1017/S1431927620024551.
- Flemetakis, S., Berndt, J., Klemme, S., Genske, F., Cadoux, A., Louvel, M., & Rohrbach, A. (). An Improved Electron Microprobe Method for the Analysis of Halogens in Natural Silicate Glasses. Microscopy and Microanalysis, 26, 1–10. doi: 10.1017/S1431927620013495.
- Steenstra, ES., Berndt, J., Klemme, S., Rohrbach, A., Bullock, E., & van, W. W. (). An experimental assessment of the potential of sulfide saturation of the source regions of eucrites and angrites: Implications for asteroidal models of core formation, late accretion and volatile element depletions. Geochimica et Cosmochimica Acta, 269, 39–62. doi: 10.1016/j.gca.2019.10.006.
- Sanchez-Valle, C., Wang, J., & Rohrbach, A. (). Effect of calcium on the elasticity of majoritic garnets and the seismic gradients in the mantle transition zone. Physics of the Earth and Planetary Interiors, 293.
- Hakim, K., Spaargaren, R., Grewal, DS., Rohrbach, A., Berndt, J., Dominik, C., & van, W. W. (). Mineralogy, Structure, and Habitability of Carbon-Enriched Rocky Exoplanets: A Laboratory Approach. Astrobiology, 19. doi: 10.1089/ast.2018.1930.
- Markus, K., Moroz, L., Arnold, G., Henckel, D., Hiesinger, H., Rohrbach, A., & Klemme, S. (). Reflectance spectra of synthetic Fe-free ortho-and clinoenstatites in the UV/VIS/IR and implications for remote sensing detection of Fe-free pyroxenes on planetary surfaces. Planetary and Space Science, 159. doi: 10.1016/j.pss.2018.04.006.
- Grützner, T., Klemme, S., Rohrbach, A., Gervasoni, F., & Berndt, J. (). The effect of fluorine on the stability of wadsleyite: Implications for the nature and depths of the transition zone in the Earth’s mantle. Earth and Planetary Science Letters, 482, 236–244. doi: 10.1016/j.epsl.2017.11.011.
- Yusenko, KV., Riva, S., Crichton, WA., Spektor, K., Bykova, E., Pakhomova, A., Tudball, A., Kupenko, I., Rohrbach, A., Klemme, S., Mazzali, F., Margadonna, S., Lavery, NP., & Brown, S. GR. (). High-pressure high-temperature tailoring of high entropy alloys for extreme environments. Journal of Alloys and Compounds, 738, 491–500. doi: 10.1016/j.jallcom.2017.12.216.
- Loroch, D., Klemme, S., Berndt, J., & Rohrbach, A. (). Experimentally determined trace element partition coefficients between hibonite, melilite, spinel, and silicate melts. Data in Brief, 21, 2447–2463. doi: 10.1016/j.dib.2018.10.100.
- C, B., ROC, F., Münker, C, A, R., T, N., IM, S., HM, H., A, Z., AK, V., & A, H. (). The great sulfur depletion of Earth's mantle is not a signature of mantle–core equilibration. Contributions to Mineraloly and Petrology, 172, 68.
- Grützner, T., Kohn, SC., Bromiley, DW., Rohrbach, A., Berndt, J., & Klemme, S. (). The storage capacity of fluorine in olivine and pyroxene under upper mantle conditions. Geochimica et Cosmochimica Acta, 208, 160–170. doi: 10.1016/j.gca.2017.03.043.
- Gervasoni, F., Klemme, S., Rohrbach, A., Grützner, T., & Berndt, J. (). Experimental constraints on mantle metasomatism caused by silicate and carbonate melts. Lithos, 282-283, 173–186. doi: 10.1016/j.lithos.2017.03.004.
- Grützner, T., Klemme, S., Rohrbach, A., Gervasoni, F., & Berndt, J. (). The role of F-clinohumite in volatile recycling processes in subduction zones. Geology, 45 (5), 443–446. doi: 10.1130/G38788.1.
- Gervasoni, F., Klemme, S., Rohrbach, A., Grützner, T., & Berndt, J. (). Experimental constraints on the stability of baddeleyite and zircon in carbonate- and silicate-carbonate melts. American Mineralogist, 102, 860–866. doi: 10.2138/am-2017-5870.
- Heckmann, A., Meister, P., Wilhelm, M. H., Rohrbach, A., Winter, M., & Placke, T. (). Synthesis of spherical graphite particles and their application as cathode material in dual-ion cells. ECS Transactions, 66 (11).
- Wijbrans, CH., Rohrbach, A., & Klemme, S. (). An experimental investigation of the stability of majoritic garnet in the Earth’s mantle and an improved majorite geobarometer. Contributions to Mineralogy and Petrology, 171 (50). doi: 10.1007/s00410-016-1255-7.
- Heckmann, A., Meister, P., Meyer, H., Rohrbach, A., Winter, M., & Placke, T. (). Synthesis of Spherical Graphite Particles and Their Application as Cathode Material in Dual-Ion Cells. ECS Transactions, 66 (11), 1–12. doi: 10.1149/06611.0001ecst.
- Rohrbach, A., Ghosh, S., Schmidt, MW., Wijbrans, CH., & Klemme, S. (). The stability of Fe-Ni carbides in the Earth's mantle: Evidence for a low Fe-Ni-C melt fraction in the deep mantle. Earth and Planetary Science Letters, 388, 211–221. doi: 10.1016/j.epsl.2013.12.007.
- Schmidt, MW., Gao, C., Golubkova, A., Rohrbach, A., & Connolly, J. AD. (). Natural moissanite (SiC) – a low temperature mineral formed from highly fractionated ultrareducing COH-fluids. Progress in Earth and Planetary Sciences, 2014 (1:27). doi: 10.1186/s40645-014-0027-0.
- Wijbrans, CH., Niehaus, O., Rohrbach, A., Pöttgen, R., & Klemme, S. (). Thermodynamic and magnetic properties of knorringite garnet (Mg3Cr2Si3O12) based on low-temperature calorimetry and magnetic susceptibility measurements. Physics and Chemistry of Minerals, 41, 341–346. doi: 10.1007/s00269-013-0653-x.
- Ballhaus, C., Laurenz, V., Münker, C., Fonseca, R. OC., Albarède, F., Rohrbach, A., Lagos, M., Schmidt, MW., Jochum, K., Stoll, B., Weis, U., Helmy, HM., & Fonseca, RO. (). The U/Pb ratio of the Earth's mantle-A signature of late volatile addition. Earth and Planetary Science Letters, 362, 237–245. doi: 10.1016/j.epsl.2012.11.049.
- Rosa, AD., Mezouar, M., Garbarino, G., Bouvier, P., Ghosh, S., Rohrbach, A., & Sanchez-Valle, C. (). Single-crystal equation of state of phase D to lower mantle pressures and the effect of hydration on the buoyancy of deep subducted slabs. Journal of Geophysical Research: Solid Earth, 118, 6124–6133. doi: 10.1002/2013JB010060.
- Klemme, S., John, T., Wessels, M., Kusebauch, C., Berndt, J., Rohrbach, A., & Schmid-Beurmann, P. (). Synthesis of trace element bearing single crystals of Chlor-Apatite (Ca5(PO4)3Cl) using the flux growth method. Chemistry Central Journal, 7, 56. doi: 10.1186/1752-153X-7-56.
- Klemme, S., Hermes, W., Eul, M., Wijbrans, CH., Rohrbach, A., & Pöttgen, R. (). New thermodynamic data for CoTiO3, NiTiO3 and CoCO3 based on low-temperature calorimetric measurements. Chemistry Central Journal, 5, 54. doi: 10.1186/1752-153X-5-54.
- Rohrbach, A., Ballhaus, C., Ulmer, P., Golla-Schindler, U., & Schonbohm, D. (). Experimental Evidence for a Reduced Metal-saturated Upper Mantle. Journal of Petrology, 52 (4), 717–731. doi: 10.1093/petrology/egq101.
- Rohrbach, A., & Schmidt, MW. (). Redox freezing and melting in the Earth's deep mantle resulting from carbon-iron redox coupling. Nature, 472 (7342), 209–212.
- Rohrbach, A. (). The oxidation state of the Earth’s asthenosphere; high-pressure experiments and energy-filtered TEM analyses. [Dissertation thesis, Westfälische Wilhelms-Universität Münster]
- Rohrbach, A., Ballhaus, C., Golla-Schindler, U., Ulmer, P., Kamenetsky, VS., & Kuzmin, DV. (). Metal saturation in the upper mantle. Nature, 449 (7161), 456–458. doi: 10.1038/nature06183.
- Rohrbach, A., Schuth, S., Ballhaus, C., Munker, C., Matveev, S., & Qopoto, C. (). Petrological constraints on the origin of arc picrites, New Georgia Group, Solomon Islands. Contributions to Mineralogy and Petrology, 149 (6), 685–698. doi: 10.1007/s00410-005-0675-6.
- Schuth, S., Rohrbach, A., Munker, C., Ballhaus, C., Garbe-Schonberg, D., & Qopoto, C. (). Geochemical constraints on the petrogenesis of arc picrites and basalts, New Georgia Group, Solomon Islands. Contributions to Mineralogy and Petrology, 148 (3), 288–304. doi: 10.1007/s00410-004-0604-0.
Supervised Doctoral Studies
- Hackler, Sebastian (): Partitioning of siderophile volatile elements during core formation
- Supervisors
- Rohrbach, Arno
- Klemme, Stephan
- Loroch, Dominik: Partitioning of siderophile volatile elements during core formation
- Supervisors
- Rohrbach, Arno
- Klemme, Stephan
- Flemetakis, Stamatis (): Halogens in the mantle: An experimental and analytical study
- Supervisors
- Klemme, Stephan
- Rohrbach, Arno
- Liu, Zairong (): Rexox controls on partial melting in the Earth's mantle
- Supervisors
- Klemme, Stephan
- Rohrbach, Arno
- Colombo Carniel, Larissa (): Perovskite stability in kimberlite melt
- Supervisors
- Klemme, Stephan
- Rohrbach, Arno