Thermal demagnetization of Martian upper crust by magma intrusion

Details Thermal demagnetization of Martian upper crust by magma intrusion Thermal demagnetization of Martian upper crust by magma intrusion

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3416302o&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 16, CiteID L16302

Biology

4

Geomagnetism And Paleomagnetism: Magnetic Anomalies: Modeling And Interpretation, Planetary Sciences: Astrobiology: Hydrothermal Systems And Weathering On Other Planets, Planetary Sciences: Solid Surface Planets: Volcanism (6063, 8148, 8450), Planetary Sciences: Solid Surface Planets: Magnetic Fields And Magnetism, Planetary Sciences: Solar System Objects: Mars

Scientific paper

The absent or weak magnetic field above large Martian volcanoes may provide constraints on their formation and the carrier of magnetization. We consider the ability of magma intrusions to thermally demagnetize the shallow crust beneath volcanoes through heat conduction and hydrothermal circulation. If magnetization is dominated by magnetite, the volume of crust that is thermally demagnetized is similar to the volume of crust emplaced since the dynamo field disappeared. If magnetization is dominated by pyrrhotite, the volume of crust that is demagnetized is typically more than twice the volume of magma intruded. Hydrothermal circulation contributes negligible additional thermal demagnetization, beyond that from heat conduction alone, for permeabilities less than O(10-15) m2.

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