Paleomagnetism of the Rochechouart meteorite impact crater: Field reversal or self reversal?

Details Paleomagnetism of the Rochechouart meteorite impact crater: Field reversal or self reversal? Paleomagnetism of the Rochechouart meteorite impact crater: Field reversal or self reversal?

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p31a1699e&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P31A-1699

Physics

[5420] Planetary Sciences: Solid Surface Planets / Impact Phenomena, Cratering

Scientific paper

Paleomagnetic investigations on the Rochechouart (France) impact structure reveal three kinds of stable magnetization directions: solely normal, solely reversed and samples with multiple, often antipodal, magnetization components. Possible explanations for this observation are: (1) the rocks record a geomagnetic field reversal during the time it took the impact melts and suevites to cool through the Curie unblocking temperature or (2) a self-reversal mechanism is to blame. We will present data from detailed stepwise demagnetization, rock magnetic and Thellier-Thellier paleointensity experiments to distinguish between the two possibilities.

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