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Prof. Dr. rer. nat. Jürgen Koepke


Studiengangskoordination
Institut für Mineralogie
Leibniz Universität Hannover
Callinstr. 3
D-30167 Hannover
Raum: 2501-143

Telefon:+49 (0)511 762-4084
Fax:+49 (0)511 762-3045
E-Mail:koepkemineralogie.uni-hannover.de
Sprechzeiten:Termine für Studienberatung können kurzfristig per Mail vereinbart werden.

Bild von Prof. Dr. rer. nat. Jürgen Koepke

Forschung  und Lehre

Forschungsschwerpunkte

  • Petrologie/Geochemie von aktiven mittelozeanischen Rücken und Ophiolithen; in-situ Beprobung ozeanischer Lithosphäre mit Forschungsschiffen; Gelände- Kampagnen im Oman-Ophiolith

  • Experimentelle Phasengleichgewichte von basischen Gesteinen; besonderes Interesse an der Rolle von H2O und fO2 auf die Differenzierungspfade

  • Aktivität im IODP (Integrated Ocean Drilling Program): Mitantragsteller bei IODP Proposal "522-Full4" (Superfast crust 4) und bei "Mission Moho"

  • Partielles Schmelzen von basischen Gesteinen

  • Kationendiffusion in silikatischen Schmelzen

  • Nutzung der µ-SRXRF (Synchrotron X-ray fluorescence microanalysis) am HASYLAB/DESY (Hamburg) für Anwendungen in der experimentellen Geochemie

  • Elektronenstrahl-Mikrosonde und Rasterelektronenmikroskopie

Projects funded by the "Deutsche Forschungsgemeinschaft" (DFG)

Project Leader (listed according to the chronological order):

 

  • Melt/rock interaction and fractional crystallization in the lower crust at Hess Deep Rift, East Pacific Rise: A combined analytical and experimental study
  • Long in-situ sections in the Wadi Gideah, Oman ophiolite: The key for understanding the mechanism of accretion, magmatic evolution and cooling of lower fast-spread oceanic crust
  • Silicate liquid immiscibility and the formation of Fe (±Ti ±P ±F ±REE) ore deposits
  • The Gabbro/Dike transition in oceanic crust generated at slow- and ultraslow-spreading ocean ridge systems
  • Assimilation, contamination and felsic melt generation at the top of the axial melt lens at fast-spreading oceanic crust: Combined geochemical and experimental investigations at the dike/gabbro transition from IODP Site 1256 (East Pacific Rise)
  • Establishing a reference profile for fast-spreading oceanic crust: Petrology and geochemistry of the "Wadi Gideah" cross section in the Oman ophiolite
  • Additional pre-survey for the project "Establishing a reference profile for fast-spreading oceanic crust: Petrology and geochemistry of the Wadi Gideah cross section in the Oman ophiolite
  • The generation of felsic magmas in the oceanic crust: assimilation-fractional crystallization processes versus re-melting of the crust
  • High-temperature hydrothermal activity in the deep oceanic crust: Experiments and investigations on natural rocks in the Oman ophiolite. Co-project leader: J. Berndt-Geddes, Münster
  • Time scales for vertically moving axial magma chambers at fast-spreading ocean ridges and involved magmatic reactions: Insights from IODP Site 1256. Co-project leader: H. Behrens, Hannover
  • Pre-survey: Magmatic evolution of the Tiger gabbroic complex (Northern Victoria Land, Antarctica): Iinsights into the lower crust of a Cambrian immature Island Arc. Co-project leader: F. Henjes-Kunst; S. Estrada (both Federal Institute for Geosciences and Natural Resources, Hannover)
  • A combined petrological geochemical and geochronological study of the magmatic rocks surrounding the Logatchev hydrothermal field.
  • The late-stage evolution of oceanic gabbros - Combined experimental and in situ isotope study on gabbros of the ODP Legs 118/176 drilled at the Southwest Indian Ridge. Co-project leader: I. Horn, Hannover.
  • Experimental investigation on the genesis of wehrlites in the deep oceanic crust: The example of the Oman ophiolite.
  • Pre-eruptive conditions of cumulate-forming MORB magmas of the Southwest Indian Ridge: Experimental study on gabbros of the ODP Legs 118 and 176. Co-project leader: J. Snow, now Houston, USA.
  • Development of a method for testing the identity of cementitious materials by trace element analysis of belite.
  • Experimental investigation on the phase equilibria in a tholeiitic ferrobasalt: The role of water activity and oxygen fugacity. Co-project leader: F. Holtz, Hannover.
  • Partial melting of oceanic gabbros in high-temperature shear zones: Melting experiments on gabbros from the ODP Legs 176 and 153. Co-project leader: J. Snow, now Houston, USA.
  • Experimental investigation on the evolution and differentiation of SiO2-rich melts within the oceanic crust: The genesis of oceanic plagiogranites. Co-project leader: F. Holtz, Hannover.

Co-project Leader (listed according to the chronological order):

 

  • Tholeiitic Basalts: The Role of primitive composition on differentiation. Project leader: F. Holtz, Hannover
  • Application of the electron microprobe to quantitative analysis of ferric-ferrous ratio in silicate glasses: new experimental calibration. Project leader: R. Almeev, Hannover.
  • Magma Differentiation processes and volatile contents in Shatsky Rise oceanic Plateau basalts: constraints from mineral, glass and melt inclusion compositions combined with experimental and thermodynamic modeling. Project leader: R. Almeev, Hannover.
  • Petrogenesis of TTG veins in oceanic gabbro: Constraints from partial melting experiments in the presence of NaCl-rich H2O-CO2 fluids. Project leader: R. Almeev, Hannover.
  • The down-hole magmatic-metamorphic evolution in basalts and gabbros monitored by Fe-Ti oxides:  A complete section of Superfast Spreading Crust at IODP Site 1256D. Project leader: F. Holtz, Hannover.
  • Magma differentiation processes and pre-eruptive conditions of MORBs (7-11°S) near Ascension Island – Constraints from experiments and phase equilibria modeling. Project leader: F. Holtz, Hannover.
  • Oceanic gabbros and associated hydrothermal Circulation under slow-spreading condition: The Trinity ophiolite, California. Project leader: H. Palme, Köln.
  • Pre-eruptive conditions of the volcanic rocks from Snake River Plain, Yellowstone Hotspot – Constraints from experiments and phase equilibria modeling. Project leader: F. Holtz, Hannover.
  • Low-pressure differentiation of basalts at the Mid-Atlantic Ridge near Ascension - Constraints from experiments at controlled volatile and oxygen fugacities. Project leader: F. Holtz, Hannover.
  • Correlation between trace element diffusion and viscosities in silicate melts: Experimental study in alkali-rich systems. Project leader: H. Behrens, Hannover.
  • Experimental study on the cation diffusion and on the kinetics of the solution of crystals in Si-rich silicate melts. Project leader: H. Behrens, Hannover.
  • Pre-neogene evolution of Crete. Project leader: B. Stöckhert, Bochum.

Vorsitz von Symposien auf internationalen Tagungen;
internationale Workshops

  • "Magma chamber processes at mid-ocean ridges", EGU General Assembly 2004 in Nizza

  • "Geodynamic processes at mid-ocean ridges", Jahrestagung der Deutschen Mineralogischen Gesellschaft 2006 in Hannover

  • "The Oceanic crust - Magma chamber processes and high-temperature reactions", Goldschmidt Konferenz 2007 in Köln

  • Magmatic processes during ocean crust formation" EGU General Assembly 2008 in Wien

  • Workshop "Basaltic Melts: genesis, differentiation, phase equilibria, and physicochemical properties" im Rahmen des DFG SPP-1055 2003 in Hannover

  • "Mid-ocean ridge hydrothermal activity at high and very high temperatures", im Rahmen des DFG SPP 1144 und D-RIDGE 2006 in Hannover

Lehre

Master Geowissenschaften

  • Verantwortlicher für das Master-Modul MM-7: Geodynamik der Mittelozeanischen Rücken
  • Verantwortlicher für die Master-Projekt-Module MMP-1 bis MMP-4
  • Verantwortlicher für das Master-Modul MM P-1: Kristallinkartierung im Raum Maloja, Oberengadin (Projektmodul: Geowissenschaftliche Kartierung)
  • Verantwortlicher für das Master-Modul MGM-1: Seminar zum Wissenschaftlichen Arbeiten
  • Mitarbeit im Modul MM-16: Mineralische Rohstoffe
  • Mitarbeit im Modul MM-12: Ortsaufgelöste Analytik

Bachelor Geowissenschaften

  • Verantwortlicher für das Modul B GW-5: Mikroskopische Analyseverfahren
  • Verantwortlicher für das Modul B PR-1: Kristallin-Kartierung: Münchberger Gneissmasse

Duchgeführte Exkursionen:


Kreta, Island, Iran, West-Alpen, Zentral-Alpen, Türkei