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

Article Abstract:

The palaeomagnetic directions of strongly magnetized rocks that are randomly oriented were investigated with vector directions changing over centimeter length scales. The magnetic field seen from high altitudes, as for martian craters, appears much lower than that of neighboring terranes, implying that magnetic anomalies of meteorite craters cannot be used as evidence for the absence of the planets internally generated magnetic field at the time of impact.

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Explosive craters and soil liquefaction

Article Abstract:

The two large, dry craters that formed during the Bhuj earthquake, and estimate the likely subsurface pressure at the time from a trajectory analysis of the ejected clasts are investigated. The investigation showed that the craters were created by explosive deformation of the ground that probably resulted from the delayed effects of soil liquefaction.

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Ancient fingerprints in the clay

Article Abstract:

The latest discovery by Mars orbiters and landers of sulphate and clay deposits on the planet indicate that the ancient Martian clays were formed in aqueous environments, but with litter carbon dioxide percentage.

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