Abstract
A magnetic anomaly near the centre of the Vredefort impact structure is attributed to remanent magnetism associated with a large meteorite impact at ≃2.0 Ga. The rocks that underlie the anomaly are shocked Archaean granites, which have extremely high remanent magnetism. We propose that the high remanence derives from elongated, micron-size single-domain magnetite particles found along shock-induced planar deformation features in quartz. The magnetite particles appear to have preferred magnetic dipole orientations, and are interpreted to have been intruded along the planar deformation features under extreme P-T conditions following the impact event.
Original language | English |
---|---|
Pages (from-to) | 151-155 |
Number of pages | 5 |
Journal | South African Journal of Geology |
Volume | 103 |
Issue number | 2 |
DOIs | |
Publication status | Published - Mar 2000 |
Externally published | Yes |
ASJC Scopus subject areas
- Geology