Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmgp23a..06r&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #GP23A-06
Mathematics
Logic
1517 Magnetic Anomalies: Modeling And Interpretation, 1595 Planetary Magnetism: All Frequencies And Wavelengths, 5417 Gravitational Fields (1221), 5440 Magnetic Fields And Magnetism, 5475 Tectonics (8149)
Scientific paper
The magnetic and gravity anomalies in selected regions between 50-180 degrees E along Mars' eastern dichotomy boundary show similar spatial scales and a roughly constant amplitude ratio, suggesting their sources are correlated near the dichotomy. This implies that the creation and/or modification of the magnetized crust may have also created density anomalies. To test this correlation and its geologic implications, magnetic and gravity field data for this region were inverted in order to better understand the origin and evolution of the dichotomy, and the structure of the remanent magnetization of the crust. Positive correlation likely indicates concomitant formation, while negative correlation may indicate a process that subsequently overprinted or removed the primary magnetization. The regions are modeled as a series of 4x4 degree rectangular prisms with uniform depth and thickness. The regions along the dichotomy studied here are the Ismenius region (50-90 degrees E), the Amenthes region (105-135 degrees E), and the Aeolis region (145- 180 degrees E). First a search is conducted over paleopole space to find the pole position(s) that provides the best fit of the predicted and observed field over the entire region. Using this paleofield direction, the magnetic and gravity field data are then inverted using various thick/thin and shallow/deep models. The depth and thickness values that give the best fit to the observed gravity and magnetic fields are selected. Using the best- fit depth and thickness, the process is repeated for a full spectrum of paleopole positions in increments of 10 degrees longitude and 5 degrees latitude in order to find the paleopole positions that gives the highest number of prisms with significantly correlated or anti-correlated magnetization and density variations within each region. These paleopole solutions are compared to the pole determined by the magnetic data alone to infer the geologic processes that affected the crust. The code has been tested with gravity and magnetic field values for known source layers and has been demonstrated to give reliable results. Results consistently favor a deep, thick source layer and the paleopoles derived from the magnetic data alone agree with previous estimates.
Kullikov I. K.
Milbury Colleen A.
Raymond Carol A.
Schubert Gerald
Smrekar Suzanne E.
No associations
LandOfFree
Constraints on Magnetic and Gravity Anomaly Source Depth and Thickness Along Mars' Eastern Dichotomy Boundary From Inversion of MGS Magnetic and Gravity Field Data 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 Constraints on Magnetic and Gravity Anomaly Source Depth and Thickness Along Mars' Eastern Dichotomy Boundary From Inversion of MGS Magnetic and Gravity Field Data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constraints on Magnetic and Gravity Anomaly Source Depth and Thickness Along Mars' Eastern Dichotomy Boundary From Inversion of MGS Magnetic and Gravity Field Data will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-963677