• 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)
 

  • Research Areas

    • 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

    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

    since
    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 WWU: DFG - Collaborative Research Centre | Project Number: TRR 170/2
    • CRC TRR 170 - C01: Partitioning of siderophile volatile elements during core formation ( - )
      Subproject in DFG-joint project hosted outside WWU: DFG - Collaborative Research Centre | 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

    • 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.
    • 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.

    • 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: https://doi.org/10.1029/2022GC010544.

    • Flemetakis S, Klemme, Stracke A, Genske F, Berndt J, Rohrbach 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.
    • 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.
    • 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.

    • 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.
    • Rzehak LJA, 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.
    • Steenstra ES, Berndt J, Klemme S, Rohrbach A, Bullock E, van Westrenen 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.

    • Hakim K, Spaargaren R, Grewal DS, Rohrbach A, Berndt J, Dominik C, van Westrenen W. (). Mineralogy, Structure, and Habitability of Carbon-Enriched Rocky Exoplanets: A Laboratory Approach. Astrobiology, 19. doi: 10.1089/ast.2018.1930.
    • 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.

    • 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 SGR. (). 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.
    • 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.

    • Ballhaus C, Fonseca ROC, Münker, C, Rohrbach A, Nagel T, Speelmanns IM, Helmy HM, Zirner A, Vogel AK, Heuser A. (). 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 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).

    • 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 JAD. (). 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 ROC, 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.

    • 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.
    • 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, Arno. (). 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.

  • Promotion

    Hackler, SebastianPartitioning of siderophile volatile elements during core formation
    Loroch, DominikPartitioning of siderophile volatile elements during core formation
    Flemetakis, StamatisHalogens in the mantle: An experimental and analytical study
    Liu, ZairongRexox controls on partial melting in the Earth's mantle
    Colombo Carniel, LarissaPerovskite stability in kimberlite melt