Palaeomagnetism of the Vredefort meteorite crater and implications for craters on Mars.

Abstract:

:Magnetic surveys of the martian surface have revealed significantly lower magnetic field intensities over the gigantic impact craters Hellas and Argyre than over surrounding regions. The reduced fields are commonly attributed to pressure demagnetization caused by shock waves generated during meteorite impact, in the absence of a significant ambient magnetic field. Lower than average magnetic field intensities are also observed above the Vredefort meteorite crater in South Africa, yet here we show that the rocks in this crater possess much higher magnetic intensities than equivalent lithologies found elsewhere on Earth. We find that palaeomagnetic directions of these strongly magnetized rocks are randomly oriented, with vector directions changing over centimetre length scales. Moreover, the magnetite grains contributing to the magnetic remanence crystallized during impact, which directly relates the randomization and intensification to the impact event. The strong and randomly oriented magnetization vectors effectively cancel out when summed over the whole crater. Seen from high altitudes, as for martian craters, the magnetic field appears much lower than that of neighbouring terranes, implying that magnetic anomalies of meteorite craters cannot be used as evidence for the absence of the planet's internally generated magnetic field at the time of impact.

journal_name

Nature

journal_title

Nature

authors

Carporzen L,Gilder SA,Hart RJ

doi

10.1038/nature03560

keywords:

subject

Has Abstract

pub_date

2005-05-12 00:00:00

pages

198-201

issue

7039

eissn

0028-0836

issn

1476-4687

pii

nature03560

journal_volume

435

pub_type

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