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Dr. Rebecca Bast


Telefon
 +49 221 470-89865

Telefax +49 221 470-5199

E-Mail: rebecca.bast(at)uni-koeln.de

Research Interests

Isotope Geo-/Cosmochemistry

  • Tracing the formation and differentiation of the first terrestrial crust using the extinct 146Sm-142Nd     system in samples from archaic cratons
  • The long-lived 176Lu-176Hf system and the origin of excess 176Hf in achondrites
  • The initial 176Hf/177Hf ratio of the Solar System
  • Stable (δ11B) and radiogenic (87Sr) isotopes as tracers during metasomatism

Geochronology

  • The effects of washing (leaching) on trace elements in minerals and thus geochronometers, especially 176Lu-176Hf
  • 176Lu-176Hf dating of garnet-bearing samples (collaborator)

Analytical Expertise

  • Routinely working in the clean lab
  • Ion-exchange chromatography (Lu-Hf, Sm-Nd, Rb-Sr)
  • Mass Spectrometry (Neptune Plus MC-ICP-MS, Triton TIMS)
  • Experience with SIMS, EPMA, SEM, Raman
  • Standard mineral separation procedures

Selected Publications

Bast R., Scherer E.E., Sprung P., Fischer-Gödde M., Mezger K., Taetz S., Böhnke M., Schmid-Beurmann H., Münker C., Kleine T., Srinivasan G. (2017): Reconciliation of the excess 176Hf conundrum in meteorites: recent disturbances of the Lu-Hf and Sm-Nd isotope systematics, Geochimica et Cosmochimica Acta 212, 303-323, doi: 10.1016/j.gca.2017.05.043.


Bast R., Scherer E.E., Bischoff A. (2017): The 176Lu-176Hf systematics of ALM-A: A sample of the recent Almahata Sitta meteorite fall. Geochemical Perspectives Letters 3, 45-54, doi: 10.7185/geochemlet.1705.


Bast R., Scherer E.E., Sprung P., Fischer-Gödde M., Stracke A., Mezger K. (2015): A rapid and efficient ion-exchange chromatography for Lu-Hf, Sm-Nd, and Rb-Sr geochronology and the routine isotope analysis of sub-ng amounts of Hf by MC-ICP-MS. Journal of Analytical Atomic Spectrometry 30, 2323-2333, doi: 10.1039/C5JA00283D.

Teaching

Geo-/cosmochemical seminar

Misc

Awards

Hildegard- und Karl-Heinrich Heitfeld-Preis in recognition of an outstanding doctoral thesis at WWU Münster in 2017

Career Development Award of the Lunar and Planetary Institute, Houston, Texas, USA in 2012

Hildegard- und Karl-Heinrich Heitfeld-Preis in recognition of an outstanding Master’s thesis at WWU Münster in 2011