Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p42a..02m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P42A-02
Mathematics
Logic
1517 Magnetic Anomalies: Modeling And Interpretation, 5417 Gravitational Fields (1221), 5440 Magnetic Fields And Magnetism, 5455 Origin And Evolution
Scientific paper
Among the most important clues to understanding the early geologic evolution of a planet is the pattern of crustal remanent magnetization. We study the processes that magnetized the lunar crust by applying a method that has already been used to study the magnetized crust of Mars. The approach involves a least squares inversion of both the gravity and magnetic field data sets and a joint analysis of the results. The use of multiple data sets reduces the inherent non-uniqueness of the inversions. The density and magnetization distributions and their correlation together with geologic and topographic data are used to infer the processes that modified the crust, e.g., magnetization or demagnetization by crustal processes. The principal concentrations of magnetic field anomalies with the strongest magnitudes are on the far side of the Moon antipodal to the Crisium, Serenitatis, Imbrium, and Orientale impact basins. Isolated near side magnetic anomalies have been mapped at Reiner Gamma, Rima Sirsalis, and the craters Descartes and Airy. Richmond and Hood (2008) have mapped previously unidentified magnetic anomalies near the craters Abel, Hartwig and Stöfler, inside the Crisium and Moscoviense basins, and near the Snellius and Rheito crater chains. Proposed sources of the lunar crustal magnetization include the solar wind magnetic field, the geomagnetic field, transient magnetic fields produced by impacts, and a lunar dynamo. Many of the magnetic anomalies have geologic and/or albedo features, that may be related to the magnetization mechanism. Analyses of the magnetic anomalies at Mare Crisium and Mare Moscoviense may provide insight into the possible existence of a former core dynamo if the anomalies within the basins are produced by crustal thermoremanent magnetization. The furrowed terrane at Mare Crisium and the albedo feature at Mare Moscoviense have been proposed to be due to seismic effects or ejecta materials from the Orientale and Humorum impacts, respectively. It is possible that the processes that formed these features may also have magnetized the crustal rocks. Abel crater is interesting because an albedo feature has not been mapped in this region and it would therefore provide a test of the association between albedo and magnetization. We will discuss the reults of the gravity and magnetic analyses of the above features.
Milbury C.
Raymond Carol A.
Schubert Gerald
Smrekar Suzanne E.
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