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Regional Analysis of the new geochemical maps of Mars surface by Mars Odyssey GRS and it implications on the Martian interior: Tharsis region
2007 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The Gamma Ray Spectrometer (GRS) on board Mars Odyssey is the first mission to provide elemental concentrations of global extent for the surface throughout the midlatitudes of Mars. Up to the time of release of this study, there are global concentration maps for Ca, Cl, Fe, H, K, Si and Th with reasonable confidence. The region of interest of this study comprises the western part of the Tharsis region and Olympus Mons where the Si map shows a well defined anomalously low region. This work aims at explaining the possible reasons for such an anomaly, and weather it can be explained through statistical considerations or geological ones. Data analysis of that region using updated software codes on IDL shows the anomaly to be statistically significant which encourages further geomorphological and geochemical analysis to deduce the possible reasons for such an anomaly. Fe is shown to have also a specific trend in the region. On the other hand, geomorphological considerations suggest the prolonged volcanic history of the region to be responsible for the observed composition. The extent of regolith or dust contribution opposed to bedrock one is discussed too. Recent work by other workers (Newsom et al., 2007) shows the dust in the heavily mantled regions on Mars to be representative to some extent, to the underlying bedrock, which facilitates the treatment of the region and gives some weight to the analysis given concerning the geological history. In addition, geochemical simulations using publicly available software of model compositions of the Martian Mantle shows that it is possible to have compositions in agreement with the GRS estimates for the region under certain conditions and constraints on the starting composition, depth and extent of partial melting and degree of fractionation. Volcanic processes are suggested to explain the low silicon anomaly. While the results are very encouraging, some questions remain open like the lack of correlation with the basaltic Martian meteorites.

Place, publisher, year, edition, pages
Keyword [en]
Physics Chemistry Maths
Keyword [sv]
Fysik, Kemi, Matematik
URN: urn:nbn:se:ltu:diva-51376ISRN: LTU-PB-EX--07/042--SELocal ID: 893cc316-bda2-44f7-a753-830c031f7f42OAI: diva2:1024737
Subject / course
Student thesis, at least 15 credits
Educational program
Space Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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