PD Dr. rer. nat. Jörg Geldmacher

Research Division 4: Dynamics of the Ocean Floor | Helmholtz Centre for Ocean Research Kiel

Research Unit: Magmatic and Hydrothermal Systems

Room: 8/D-202
Phone: +49 431 600-2260
Fax: +49 431 600-2924
E-Mail: jgeldmacher(at)

GEOMAR | Helmholtz Centre for Ocean Research Kiel
East shore campus
Wischhofstrasse 1-3
D-24148 Kiel

Education and Career

  • since 2014 Privatdozent, Kiel University
  • 2011-2018 Coordinator Programme-oriented Funding (PoF III) "OCEANS", GEOMAR
  • since 2011 Senior Scientist, GEOMAR Helmholtz Centre for Ocean Research Kiel
  • 2008-2011 Adjunct Professor, Dept. of Geology, Texas A&M University, USA
  • 2007-2011 Staff Scientist/Expedition Manager, Integrated Ocean Drilling Program, USA      
  • 2007 Habilitation, Kiel University 
  • 2002-2006 Research Associate, Leibniz-Inst. for Marine Sciences, IFM-GEOMAR,
  • 2000-2002 Postdoctoral fellow, San Diego State University, USA                     
  • 2000 Dr. rer. nat., Kiel University
  • 1996-1999 PhD student, Geomar Research Center, Kiel, Germany  
  • 1996 Diploma in Geology and Paleontology, Kiel University

Scientific Interests

  • Igneous geochemistry and geochronology (including radiogenic isotope systems)
  • Geochemistry of oceanic volcanic rocks and the composition and dynamics of the Earth's mantle
  • Origin and evolution of intraplate volcanism (including Large Igneous Provinces) and plate tectonic reconstructions
  • Hydrothermal and low-temperature alteration of oceanic crust

Seagoing Research Experience

  • 2022: DRV JOIDES Resolution "Exp. 392: Agulhas Plateau"
  • 2021: RV METEOR "M176: Biscay" (chief scientist)
  • 2020: RV METEOR "M168: Kings Trough"
  • 2019: RV Maria S. Merian "MSM82: RIOGRANDE"
  • 2018: RV Sonne "SO265: Shatsky Evolution“ (chief scientist)
  • 2017 RV Poseidon "POS 511: Santorini Evolution" (chief scientist)
  • 2014:  RV Sonne "SO 234/1: SPACES"
  • 2014: RV Sonne "SO 233: Walvis II"
  • 2011: DRV JOIDES Resolution “Exp. 330: Louisville Hotspot”
  • 2009: DRV JOIDES Resolution “Exp. 324: Shatsky Rise”                                 
  • 2009:  DRV JOIDES Resolution “Exp. 320T”                                                     
  • 2005: DRV JOIDES Resolution “Exp. 309: Superfast”                                 
  • 2003: RV Sonne “SO 169: Zealandia“                                         
  • 2001: RV Meteor “50/1-VULKOSA: East Atlantic Volcanism/Alboran Sea“ 
  • 1998: RV Akademik Lavrentyev “KOMEX II: Okhotsk Sea“
  • 1997: RV Poseidon “POS 235: East Atlantic Volcanism/ Alboran Sea“          
  • 1997: RV Poseidon “POS 232: Azores Volcanism“                       
  • 1993: RV Sonne “SO 84: St. Helena Hotspot“


Publications (peer-reviewed)

  • Homrighausen S., Hoernle K., Hauff F., Hoyer P., Haase K., Geissler W., Geldmacher J. (2023) Evidence for compositionally distinct upper mantle plumelets since the early history of the Tristan-Gough hotspot" Nature Communications (in press)
  • Liao R., Zhu H., Geldmacher J., Li C. Liu H., Sun W. (2023) The role of recycled oceanic crust in the alkaline basalts: Evidence from Zn isotopic composition of alkaline basalts from the Madeira hotspot (eastern North Atlantic). Chemical Geology 635, doi: 10.1016/j.chemgeo.2023.121606
  • Geldmacher J., Hauff F., Dürkefälden A., Sano T., Garbe-Schönberg D., Portnyagin M., Hoernle K. (2023) The effects of submarine alteration and phosphatization on igneous rocks: Implications for Sr-, Nd-, Pb-isotope studies. Chemical Geology 631, doi: 10.1016/j.chemgeol.2023.121509.
  • Geldmacher J., Hauff F., Dürkefälden A., Sano T., Garbe-Schönberg D., Portnyagin M., Hoernle K. The effects of submarine alteration and phosphatization on igneous rocks: Implications for Sr-, Nd-, Pb-isotope studies. Chemical Geology (in review)
  • Zhou H., Hoernle K., Geldmacher J., Hauff F., Homrighausen, S., Garbe-Schönberg D., Jung S., Bindeman I. (2022) A HIMU volcanic belt along the SW African coast (~83-49 Ma): New geochemical clues to deep mantle dynamics from carbonatite and silica-undersaturaed complexes in Namibia. Lithos 430-431, doi: 10.1016/j.lithos.2022.106839.
  • Pank K., Hansteen T.-H., Geldmacher J., Garbe-Schönberg D., Jicha B., Hauff F., Nomikou P., Hoernle K (2022) Mineralogy and geochemistry of lavas from the submarine lower caldera walls of Santorini Volcano (Greece). Journal of Volcanology and Geothermal Research 427, doi: 10.1016/j.volgeores.2022.107556.
  • Zhou H., Hoernle K., Geldmacher J., Hauff F., Garbe-Schönberg D., Jung S., Bindeman I (2022) Enriched mantle one (EMI) type carbonatitic volcanism in Namibia. Evidence for a concentrically-zoned Etendeka plume head. Gondwana Research 109, 239-252, doi: 10.1016/
  • Dürkefälden A., Geldmacher J., Portnyagin M., Garbe‐Schönberg D., Werner R., Müller D., Hauff F., Hoernle K. (2021) Papanin Ridge and Ojin Rise Seamounts (Northwest Pacific): Dual Hotspot Tracks Formed by the Shatsky Plume. Geochemistry, Geophysics, Geosystems, 22 (9), e2021GC009847.
  • Homrighausen S., Hoernle K., Zhou H., Geldmacher J., Wartho J.-A., Hauff F., Werner R., Jung S., Morgan J.P. (2020) Paired hotspot tracks in the South Atlantic – Starting plumes heads trigger compositionally distinct secondary plumes? Science Advances 6, eaba0282.
  • Long X., Geldmacher J., Hoernle K., Hauff  F., Wartho J.-A., Garbe-Schönberg D. (2020) Origin of isolated seamounts in the Canary Basin (East Atlantic): The role of plume material in the origin of seamounts not associated with hotspot tracks. Terra Nova 32, 390-398,
  • Long X., van der Zwan F., Geldmacher J., Hoernle K., Hauff  F., Garbe-Schönberg D., Augustin N. (2020) Insights into the petrogenesis of an intraplate volcanic province: Sr-Nd-Pb-Hf isotope geochemistry of the Bathymetrists Seamount Province, eastern equatorial Atlantic (2020) Chemical Geology 544, doi: 10.1016/j.chemgeo.2020.119599
  • Zhou H., Hoernle K., Geldmacher J., Hauff F., Homrighausen S., Garbe-Schönberg D., Jung S. Geochemistry of Etendaka magmatism: Spatial heterogeneity in the Tristan-Gough plume head (2020) Earth and Planetary Science Letters 535, doi: 10.1016/j.epsl.2020.116123
  • Long X, Geldmacher J, Hoernle K, Hauff F, Wartho J, Garbe-Schönberg D, Grevemeyer I (2019) Age and origin of Researcher Ridge and an explanation for the 14°N anomaly on the Mid-Atlantic Ridge by plume-ridge interaction. Lithos, 326-327, 540-555 DOI  10.1016/j.lithos.2019.01.005
  • Homrighausen S., Hoernle K., Hauff F., Geldmacher J., Wartho J. A., Bogaard P.v.d., Garbe-Schönberg D. (2018) Global distribution of the HIMU end member: Formation through Archean plume-lid tectonics. Earth-Science Reviews, 182, 85-101, DOI 10.1016/j.earscirev.2018.04.009
  • Homrighausen S., Hoernle K., Geldmacher J., Wartho J.A., Hauff F., Portnyagin M., Werner R., Bogaard P.v.d., Garbe-Schönberg D. (2018) Unexpected HIMU-type late-stage volcanism on the Walvis Ridge. Earth and Planetary Science Letters, 492, 251-263, DOI 10.1016/j.epsl.2018.03.049
  • Sager W., Sano T., Geldmacher J. (2016) Formation and evolution of Shatsky Rise oceanic plateau: Insights from IODP Expedition 324 and recent geophysical cruises. Earth Science Reviews 159, 306-336, DOI 10.1016/j.earscirev.2016.05.011
  • Tejada M.L.G., Geldmacher J., Hauff F., Heaton D., Koppers A., Garbe-Schönberg D., Hoernle K., Heydolph K., Sager W.W. (2016) Geochemistry and Age of Shatsky, Hess, and Ojin Rise seamounts: Implications for a connection between the Shatsky and Hess Rises. Geochemica et Cosmochimica Acta 185, 302-327
  • Li S., Geldmacher J., Hauff F., Garbe-Schönberg D., Yu S., Zhao S., Rausch S. (2014) Composition and timing of carbonate vein precipitation within the igneous basement of the Early Cretaceous Shatsky Rise, NW Pacific. Marine Geology 357, 321-333
  • Geldmacher J., Bogaard P.v.d., Heydolph K., Hoernle K. (2014) The age of Earth's largest volcano: Tamu Massif on Shatsky Rise (northwest Pacific Ocean). International Journal of Earth Sciences 103(8), 2351-2357
  • Höfig T.W., Geldmacher J., Hoernle K., Hauff F.,  Duggen S., Garbe-Schönberg D. (2014) From the lavas down to the gabbros: 1.25 km of geochemical and Sr-Nd-Hf-Pb isotopic constraints on hydrothermal alteration of upper oceanic crust at ODP/IODP Site 1256, eastern equatorial Pacific. Lithos 210-211, 289-312, DOI 10.1016/j.lithos.2014.08.013
  • Heydolph K., Murphy D., Geldmacher J., Romanova I., Greene A., Hoernle K., Mahoney J. (2014) Plume versus plate origin for the Shatsky Rise oceanic plateau (NW Pacific): Insights from Nd, Pb and Hf isotopes. Lithos 200-201, 49-63
  • Lustrino M., Fedele L., Melluso L., Morra V., Ronga F., Geldmacher J., Duggen S., Agostini S., Franciosi L., Meisel T. (2013) Origin and evolution of Cenozoic magmatism of Sardinia (Italy) A combined isotopic (Sr-Nd-Pb-O-Hf-Os) and petrological view. Lithos 180-181, 138-158
  • Gurenko A.A., Geldmacher J, Hoernle K., Sobolev A.V. (2013) A composite, isotopically-depleted peridotite and enriched pyroxenite source of Madeira magmas: Insights from olivine. Lithos 170-171, 224-238
  • Geldmacher J., Höfig T., Hauff F., Hörnle K., Garbe-Schönberg D., Wilson D.S. (2013) Influence of the Galápagos hotspot on the East Pacific Rise during Miocene superfast spreading. Geology 41 (2), 183-186, doi: 10.1130/G33533.1
  • Koppers A.A.P., Yamazaki T., Geldmacher J., Gee J.S., Pressling N., Hoshi H., and the IODP Expedition 330 Scientific Party (2012) Limited latitudinal mantle plume motion for the Louisville hotspot. Nature Geoscience 5, 911-917
  • Geldmacher J., Hoernle K., Hanan B., Blichert-Toft J., Hauff F., Gill J.B., Schmincke H.-U. (2011) Hafnium isotopic variations in East Atlantic intraplate volcanism. Contributions to Mineralogy and Petrology 162 (1), 21-36, doi: 10.10007/s00410-010-0580-5
  • Sager W.W., Sano T., Geldmacher J. (2011) How do oceanic plateaus form? Clues from drilling at Shatsky Rise. EOS 92 (5), 37-38
  • Hoernle K., Hauff F., Werner R., Bogaard P.v.d., Mortimer N., Geldmacher J., Davy B. (2010) Age and Geochemistry of volcanic rocks from the Hikurangi and Manihiki oceanic plateaus: A tale of two large Cretaceous volcanic events. Geochimica et Cosmochimica Acta 74 (24), 7196-7219
  • Geldmacher J., Hoernle K., Bogaard P.v.d., Hauff F., Klügel A (2008) Age and geochemistry of the Central American forearc basement (DSDP Leg 67 and 84): Insights into Mesozoic arc volcanism and seamount accretion on the fringe of the Caribbean Large Igneous Province. Journal of Petrology 49 (10), 1781-1815
  • Duggen S., Hoernle K., Klügel A., Geldmacher J., Thirlwall M., Hauff F., Lowry D., Oates N. (2008) Geochemical zonation of the Miocene Alboran basin volcanism (westernmost Mediterranean): Geodynamic implications. Contributions to Mineralogy and Petrology 156, 577-593
  • Geldmacher J., Hoernle K., Klügel A., Bogaard P.v.d., Bindeman I. (2008) Geochemistry of a new enriched mantle type locality in the northern hemisphere: Implications for the origin of the EM-I source. Earth and Planetary Sciences Letters 265, 167-182
  • Geldmacher J., Hoernle K., Klügel A., Bogaard P.v.d., Wombacher F., Berning B. (2006) Origin and geochemical evolution of the Madeira-Tore Rise (eastern North Atlantic). Journal of Geophysical Research 111, B09206, doi: 10.1029/2005JB003931
  • Wilson D.S., Teagle D.A.H., Alt J.C., Banerjee N.R., Umino S., Miyashita S., Acton G.A., Anma R., Barr S.R., Belghoul A., Carlut J., Christie D.M., Coggon R.M., Cooper K.M., Cordier C., Crispini L., Rodriguez Durand S., Einaudi F., Galli L., Gao Y., Geldmacher J., Gilbert L.A., Hayman N.W., Herrero-Bervera E., Hirano N., Holter S., Ingle S., Jiang S., Kalberkamp U., Kerneklian M., Morgan S., Neo N., Nichols H.J., Park S.-H., Reichow M.K., Sakuyama T., Sano, T., Sandwell R., Scheibner B., Smith-Duque C.E., Swift S.A., Tartarotti P., Tikku A.A., Tominaga M., Veloso E.A., Yamasaki T., Yamasaki S., Ziegler C. (2006) Drilling gabbro in intact ocean crust formed at the East Pacific Rise. Science 312, 1016-1020
  • Geldmacher J., Hoernle K., Klügel A., Bogaard P.v.d., Duggen S. (2006) A geochemical transect across a heterogeneous mantle upwelling: implications for the evolution of the Madeira hotspot in space and time. Lithos 90, 131-144
  • Geldmacher J., Hoernle K., Bogaard P.v.d., Duggen S., Werner R. (2005) New 40Ar/39Ar age and geochemical data from seamounts in the Canary and Madeira volcanic province: Support for the mantle plume hypothesis. Earth and Planetary Science Letters 237, 85-101
  • Klügel A., Walter T.R., Schwarz S., Geldmacher J. (2005) Gravitative spreading causes en-echelon diking along a rift zone of Madeira archipelago: An experimental approach and implications for magma transport. Bulletin of Volcanology 68, 37-46
  • Schwarz S., Klügel A., Bogaard P.v.d., Geldmacher J. (2005) Internal structure of a volcanic rift system in the eastern North Atlantic: The Desertas rift zone, Madeira archipelago. Journal of Volcanology and Geothermal Research 141, 123-155
  • Geldmacher J., Hanan B.B., Blichert-Toft J., Harpp K., Hoernle K., Hauff F., Werner R., Kerr A. (2003) Hf isotopic variations in volcanic rocks from the Caribbean Large Igneous Province and Galápagos hotspot tracks. Geochemistry, Geophysics, Geosystems 4 (7), 2002GC000477
  • Geldmacher J., Troll V.R., Emeleus C.H., Donaldson C.H. (2002) Pb-isotope evidence for contrasting crustal contamination of primitive to evolved magmas from Ardnamurchan and Rum: implications for the structure of the underlying crust.  Scottish Journal of Geology 38, 55-61
  • Geldmacher J., Hoernle K., Bogaard P.v.d., Zankl G., Garbe-Schönberg D. (2001) Earlier history of the ³ 70 Ma old Canary Hotspot based on the temporal and geochemical evolution of the Selvagen Archipelago and neighboring seamounts in the eastern North Atlantic. Journal of Volcanology and Geothermal Research 111, 55-87
  • Geldmacher J., Hoernle K. (2000) The 72 Ma Geochemical Evolution of the Madeira Hotspot (eastern North Atlantic): Recycling of Palaeozoic (≤ 500 Ma) Basaltic and Gabbroic Crust. Earth and Planetary Science Letters 183, 73-92
  • Geldmacher J., Bogaard P.v.d., Hoernle K., Schmincke H.-U. (2000) The 40Ar/39Ar dating of the Madeira archipelago and hotspot track (eastern North Atlantic). Geochemistry, Geophysics, Geosystems 1 (1), 1999GC000018
  • Geldmacher J., Haase K.M., Devey C.W., Garbe-Schönberg D. (1998) The petrogenesis of Tertiary cone-sheets in Ardnamurchan, NW Scotland: petrological and geochemical constraints on crustal contamination and partial melting. Contributions to Mineralogy and Petrology 131, 196-209


Popular scientific publication

  • Homrighausen S., Geldmacher J., Hoernle K., Roony T. (2021) Intraplate volcanism. In: Alderton D., Elias S.A. (eds.) Encyclopedia of Geology, vol. 2, 52-59. United Kingdom: Academic Press. doi: 10.1016/B987-0-12-409548-9.12489-4
  • Geldmacher J., Werner R., Hauff F., Uenzelmann-Neben G. (2020) Marine Supervulkane und deren Auswirkung in der Erdgeschichte. In: Jorzik O., Kandarr J., Klinghammer P., Spreen D. (eds.) ESKP-Themenspecial Vulkanismus und Gesellschaft. Zwischen Risiko, Vorsorge und Faszination, 117-120. Potsdam: Helmholtz-Zentrum Postdam Deutsches GeoForschungsZentrum GFZ.

  • Voß T., Bürkner G., Geldmacher J. (2000) So entstand Schleswig-Holstein: Die Entstehungsgeschichte eines von Gletschern geformten Landes. Geo Print Verlag Elmshorn, ISBN No. 3-9806998-0-3