Rapid decrease in Martian crustal magnetization in the Noachian era: Implications for the dynamo and climate of early Mars

Details Rapid decrease in Martian crustal magnetization in the Noachian era: Implications for the dynamo and climate of early Mars Rapid decrease in Martian crustal magnetization in the Noachian era: Implications for the dynamo and climate of early Mars

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3514203l&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 14, CiteID L14203

Other

39

Planetary Sciences: Solid Surface Planets: Magnetic Fields And Magnetism, Geomagnetism And Paleomagnetism: Magnetic Anomalies: Modeling And Interpretation, Geomagnetism And Paleomagnetism: Paleointensity, Planetary Sciences: Solid Surface Planets: Impact Phenomena, Cratering (6022, 8136), Planetary Sciences: Solid Surface Planets: Interiors (8147)

Scientific paper

The magnetic signatures and crater retention ages of the 19 largest (>1000 km diameter) impact basins on Mars are examined to constrain the history of the acquisition of crustal magnetization during the Noachian era. The 5 most clearly impact-demagnetized basins are younger than the 14 basins within which lies substantially re-magnetized crust. Poisson analysis shows that the most likely time of this magnetization cessation was 4.115-4.13 Ga (model age) and that it occurred quickly, taking less than 20 Ma. A global decrease in effective crustal magnetic susceptibility due, e.g., to a decrease in the rate of hydrothermal alteration, is one possible explanation. Alternatively, the cessation of post-impact magnetization reflects the rapid death of the Martian dynamo.

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