Laboratory and Field Experiments to Better Understand Magnetic Anomalies of Meteorite Impacts

Details Laboratory and Field Experiments to Better Understand Magnetic Anomalies of Meteorite Impacts Laboratory and Field Experiments to Better Understand Magnetic Anomalies of Meteorite Impacts

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmgp41c..05g&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #GP41C-05

Other

0654 Plasmas, 0925 Magnetic And Electrical Methods (5109), 1517 Magnetic Anomalies: Modeling And Interpretation, 1540 Rock And Mineral Magnetism, 3929 Nmr, Mossbauer Spectroscopy, And Other Magnetic Techniques

Scientific paper

The thermal and tectonic history of planets can be gleaned from the ancient magnetic fields recorded in their rock records. Because meteorite impacts alter the magnetic signals of rocks, one can hope to work out an approximate magnetic stratigraphy of a planet based on the relative timing of core dynamo activity versus the age of meteorite impact. Such is the common perception for Mars, whose giant impact craters, Hellas and Argyre, possess significantly lower magnetizations than surrounding regions. The typical assumption is that rocks in the craters were shock demagnetized in the absence of a core dynamo. To test these assumptions and to better understand the effects of stress on the remanent magnetizations of rocks, we have been carrying out both laboratory and field experiments. Here we report stress demagnetization experiments on single and multi-domain magnetite, the magnetic mineral most likely to carry the magnetic remanence on Mars. We also report paleomagnetic and geomagnetic measurements in the Vredefort crater, whose basement rocks carry magnetite as the remanence-bearing magnetic mineral. We conclude that magnetic fields fossilized in the rock record of meteorite impacts cannot be used to ascertain the presence or absence of a planet`s dynamo as previously assumed.

Affiliated with

Also associated with

No associations

Rating

Laboratory and Field Experiments to Better Understand Magnetic Anomalies of Meteorite Impacts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Laboratory and Field Experiments to Better Understand Magnetic Anomalies of Meteorite Impacts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laboratory and Field Experiments to Better Understand Magnetic Anomalies of Meteorite Impacts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-751992