Tehostekuvassa fysiikan laitosta etuoven suunnalta

2c. Laboratory shock experiments: magnetite pellets

Participating scientists

  • T. Kohout
  • L.J. Pesonen
  • A. Deutsch
  • K. Wűnnemann
  • A. Hornemann
  • E. Heikinheimo

Project goals

We have shocked the specially prepared magnetite pellets at 0 -45 GPa to study the shock induced changes in magnetite in order to shed light to geophysical modellings of impact structures.

Fig.1: Post shock porosity vs. shock pressure

Highlights

The study of the shocked target rocks reveal that the impact induced porosity is the major cause for geophysical anomalies around impact structures. A unique petrophysical database collected from eighteen impact structures in igneous target rocks, verifies that porosity is responsible for gravity, EM and electrical conductivity minima. These petrophysical ground-truth data obtained for impact and target rocks were used to provide geophysical models of impact structures.

Recent publications

  • Kohout, T., Pesonen, L.J., Deutsch, A., Wünnemann, K., Nowka, D., Hornemann, U., Heikinheimo, E., 2012. Shock experiments in range of 10-45 GPa with small multidomain magnetite in porous targets. Meteoritics & Planetary Science, 47(10), 1671-1680.
  • Kohout, T., Pesonen, L. J., Deutsch A., Hornemann, U. and Heikinheimo, E., 2008. Shock recovery experiments in the range of 10 to 45 GPa - comparison of results of synthetic magnetite and terrestrial diabase. Eos Trans. AGU, 89(53), Fall Meet. Suppl., Abstract GP21C-0790.