Institut für Geo- und Umweltnaturwissenschaften

Mineralogie - Petrologie 

Albertstraße 23b   

79104 Freiburg i. Br.       

Tel.: +49 (0)761 -203-6396  




Dr. Harri Geiger

Assistent für Mineralogie und Petrologiegeiger-full

Institut für Geo- und Umweltnaturwissenschaften                                                       
Mineralogie - Petrologie
Albertstraße 23b 
79104 Freiburg

Fon:  0761 / 203 6416 direkt
Fon:  0761 / 203 6396 Sekretariat
E-Mail: harri.geiger@minpet.uni-freiburg.de

Identifiers: Google Scholar


  • 2019 Ph.D. in Geochemistry and Petrology, Uppsala University, Uppsala, Sweden 
    Thesis: Trans-crustal magma storage in contrasting tectonic settings.
  • 2014 M.Sc. Geology, Uppsala University, Uppsala, Sweden
    Thesis: Characterising the magma supply system of Agung and Batur volcanoes on Bali, Indonesia. 
  • 2011 B.Sc. in Earth and Space Sciences, Jacobs University Bremen, Bremen, Germany 
    Thesis: Seasonal variation of the rare earth element concentration in the acidic Bullensee lakes in Lower Saxony and the impact of colloid particles on the removal of humic acids and iron. 
  • 2011 B.Sc. in Electrical and Computer Engineering, Jacobs University Bremen, Bremen, Germany 
    Thesis: Smart and efficient Energy Storage in Megacities. 

Research interests

My research interests lie broadly in the field of geochemistry and petrology with particular emphasis on isotope and elemental microanalysis. Currently my research focuses on the characterization of magmatic systems, from magma generation and source processes to magma transport, evolution, and eruptive behaviour. In short, my research aims at advancing our understanding of magmatic systems from their roots to the surface. In this context, I am applying a combination of different methods including traditional petrology and petrography, mineral (-melt) thermobarometric modelling, and isotopic analytical techniques. My study areas currently include Cameroon, the Canary Islands, Iceland, Indonesia, Ireland, and the Andes.

Awards, stipends, and grants 

  • 2018: Scientific Reports Top 100 Read Articles 2018 (for Geiger et al. 2018, #10 out of 100)
  • Geoscience 2017 stipend, Royal Swedish Academy of Sciences (KVA), Stockholm, Sweden.
  • “Liljewalchs travel scholarship”, Stipendienheten, Uppsala University.
  • “Otterborg stipend”, Geological Section, Uppsala University, Sweden.
  • “Jänes travel scholarship”, Stipendienheten, Uppsala University, Sweden.
  • Mourne Cooley Gullion Bursary Grant 2015, Northern Ireland.

Teaching / Courses

      If you are looking for a Bachelor's or Master's project please feel free to contact me.



  • since 2020: assistant/post doc at the Institute of Earth and Environmental Sciences, University of Freiburg, Germany


  • Troll, V.R., Aulinas, M., Carracedo, J.C., Geiger, H., Perez-Torrado, F.J., Soler, V., Deegan, F.M., Bloszies, C., Weis, F., Albert, H., Gisbert, G., Day, J.M.D., Rodríguez-Gonzalez, A., Gazel, E., and Dayton, K. (2024), The 2021 La Palma eruption: social dilemmas resulting from life close to an active volcano. Geology Today, 40, 96-111, DOI
  • Gisbert, G., Troll, V.R., Day, J.M.D., Geiger, H., Perez-Torrado, F., Aulinas, M., Deegan, F.M., Albert, H., and Carracedo, J.C. (2023) Reported ultra-low lava viscosities from the 2021 La Palma eruption are potentially biased. Nature Communications, 14, 6453, DOI
  • Jägerup, S.B., Troll, V.R., Geiger, H., Deegan, F.M., Harris, C., Carracedo, J.C., Meade, F.C., Omidian, S., Zaczek, K., and van der Zwan, F.M. (2023) Silicic frothy xenoliths (xeno-pumice) in recent volcanics from Gran Canaria, Canary Islands. Journal of Volcanology and Geothermal Research, 440, 107857, DOI
  • Radu, I-B., Skogby, H., Troll, V.R, Deegan, F.M., Geiger, H., Müller, D., and Thordarson, T. (2023) Water in clinopyroxene from the 2021 Geldingadalir eruption of the Fagradalsfjall Fires, SW-Iceland. Bulletin of Volcanology, 85 (31)., DOI
  • Dayton, K., Gazel, E., Wieser, P., Troll, V.R., Carracedo, J.C., La Madrid, H., Roman, D.C., Ward, J., Aulinas, M., Geiger, H., Deegan, F.M., Gisbert, G., and Perez-Torrado, F. (2023) Deep magma storage during the 2021 La Palma eruption. Science Advances, 9:6., DOI
  • Day, J.M.D., Geiger, H., Troll, V.R., Perez-Torrado, F.J., Aulinas, M., Gisbert, G., and Carracedo, J.C. (2022) Bouncing spallation bombs during the 2021 La Palma eruption, Canary Islands, Spain. Earth Science, Systems and Society, 2:10063, DOI
  • Deegan, F.M., Bédard, J.H., Grasby, S.E., Dewing, K., Geiger, H., Misiti, V., Capriolo, M., Callegaro, S., Svensen, H.H., Yakymchuk, C., Aradi, L.E., Freda, C., and Troll, V.R. (2022) Magma–shale interaction in large igneous provinces: implications for climate warming and sulfide genesis. Journal of Petrology, 63 (9), 1-10, DOI
  • Day, J.M.D., Troll, V.R., Aulinas, M., Deegan, F.M., Geiger, H., Carracedo, J.C., Gisbert Pinto, G., and Perez-Torrado, F.J. (2022) Mantle source characteristics and magmatic processes during the 2021 La Palma eruption. Earth and Planetary Science Letters, 597 (1), 117793, DOI
  • Carracedo, J.C., Troll, V.R., Day, J.M.D., Geiger, H., Aulinas, M., Soler, V., Deegan, F.M., Perez-Torrado, F.J., Gisbert Pinto, G., Gazel, E., Rodríguez-Gonzalez, A., and Albert, H. (2022) The 2021 eruption of the Cumbre Vieja Volcanic Ridge on La Palma, Canary Islands. Geology Today, 38, 94-107, DOI
  • Darmawan, H., Troll, V.R., Walter, T.R., Deegan, F.M., Geiger, H., Heap, J.M., Seraphine, N., Harris, C., Humaida, H., and Müller, D. (2022) Hidden mechanical weaknesses within lava domes provided by buried high-porosity hydrothermal alteration zones. Scientific Reports, 12: 3202, DOI
  • Aulinas, M., Rodríguez-González, A., Albert Minguez, H., Cabrera, M., Carracedo, J.C., Day, J.M.D., Fernández-Turiel, J.L., Gazel, E., Geiger, H., Pinto, G.G., Prieto-Torrell, C., Troll, V.R., and Perez-Torrado, F.J. (2021) La erupción de 2021 en La Palma (Islas Canarias) bajo el microscopio. Enseñanza de las Ciencias de la Tierra, 29.2, 250-252.
  • Deegan F. M., Whitehouse M.J., Troll V.R., Geiger, H., Jeon H., le Roux P., Harris Ch., van Helden M. and González-Maurel O. (2021) Sunda arc mantle source ∂18O value revealed by intracrystal isotope analysis. Nature communications, 12:3930, DOI
  • Troll, V.R., Rodriguez-Gonzalez, A., Deegan, F.M., Perez-Torrado, F.M., Carracedo, J.C., Thomaidis, K., Geiger, H. and Meade, F.C. (2019) Sacred ground; the Maipés necropolis of north-west Gran Canaria. Geology Today, 35: 55-62, DOI
  • Deegan, F. M., Troll, V.R. & Geiger, H. (2019) Forensic probe of Bali’s great volcano, Eos, Transactions, American Geophysical Union, 100: 26-30, DOI
  • Geiger, H., Troll, V.R., Jolis, E.M., Deegan, F.M., Harris, C., Hilton, D.R. & Freda, C. (2018) Multi-level magma plumbing at Agung and Batur volcanoes increases risk of hazardous eruptions. Scientific Reports, 8, 10547, DOI
  • Troll, V.R., Carracedo, J.C., Jägerup, B., Streng, M., Barker, A.K., Deegan, F.M., Perez-Torrado, F., Rodriguez-Gonzalez, A. & Geiger, H. (2017) Volcanic particles in agriculture and gardening. Geology Today, 33, 148-154, DOI
  • Deegan, F.M., Whitehouse, M.K., Troll, V.R., Budd, D.A., Harris, C., Geiger, H. & Hålenius, U. (2016) Pyroxene standards for SIMS oxygen isotope analysis and their application to Merapi volcano, Sunda arc, Indonesia. Chemical Geology, DOI
  • Geiger, H., Barker, A.K. & Troll, V.R. (2016a) Locating the depth of magma supply for volcanic eruptions, insights from Mt. Cameroon. Scientific Reports, 6, 33629, DOI
  • Geiger, H., Mattsson, T., Deegan, F.M., Troll, V.R., Burchardt, S., Gudmundsson, Ó., Tryggvason, A., Krumbholz, M. & Harris, C. (2016b) Magma plumbing for the 2014-15 Holuhraun eruption, Iceland. Geochemistry, Geophysics, Geosystems, 17, 2953-2968, DOI
  • Deegan, F.M., Troll, V.R., Bédard, J.H., Evenchick, C.A., Dewing, K., Grasby, S., Geiger, H., Freda, C., Misiti, V., Mollo, S. (2016) The stiff upper LIP: investigating the High Arctic Large Igneous Province. Geology Today 32, 92-98, DOI



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