Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p32a..04k&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #P32A-04
Physics
5109 Magnetic And Electrical Properties, 5420 Impact Phenomena (Includes Cratering), 1517 Magnetic Anomaly Modeling
Scientific paper
Martian impact basins are associated with various intensity of magnetic remanence detected by Mars Global Surveyor (MGS). The impact events evidenced by these basins produce a shock wave that penetrates deep into the Martian crust. According to approximate scaling laws shock pressures on the order of 1 Gpa (assuming the impact velocity of 15 km/s) can occur at distances of several crater radii. We use magnetic maps of the Martian crust over the large impact basins and estimate the radius of demagnetized volume due to impact. We assume that this volume, affected by up to 1 Gpa shock pressure, is directly related to magnetic coercivity of the carriers generating magnetic anomalies. Coercivity variation depends on the domain size as well as magnetic mineralogy. Our experimental data indicate1 Gpa shock stability in the following order: titanohematite (80%), MD hematite (32%), SD magnetite (30%), multi-domain magnetite (15%). Natural remanences left in these minerals were, 505 A/m, 250 A/m, 1,000 A/m, 20 A/m respectively. From the volume demagnetized by impact we infer both the magnetic coercivity as well as the carrier of Martian magnetic anomalies.
Acuña Mario Humberto
Connerney J. E.
Kletetschka Gunther
Wasilewski Peter J.
No associations
LandOfFree
Shock demagnetization of Martian crust 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 Shock demagnetization of Martian crust, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shock demagnetization of Martian crust will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1721803