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Gamma Ray Spectrometer - 2001 Mars Odyssey - Lunar and Planetary Lab - The University of Arizona

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2008-01-14: Hydrogen Map
2008-01-14: Silicon Map
2008-01-14: Iron Map
2008-01-14: Chlorine Map
2008-01-14: Potassium Map
2008-01-14: Thorium Map
2006-03-10: Hydrogen Map
2006-03-10: Silicon Map
2006-03-10: Iron Map
2006-03-10: Chlorine Map
2006-03-10: Potassium Map
2006-03-10: Thorium Map
2004-07-29: Global Map of Martian Hydrogen
2004-07-29: Map of Martian Hydrogen at the North Pole
2004-07-29: Potassium and Thorium Tell an Interesting Story
2004-07-28: Watch and Listen to Seasonal Changes in Martian Polar Ice

2008-01-14: Silicon Map

This gamma ray spectrometer map of the mid-latitude region of Mars is based on gamma rays from the element silicon. Silicon, with the chemical symbol Si, is one of the most abundant elements on the surface of both Mars and Earth, second only to oxygen. Regions of low silicon, shown in dark blue and violet, may be related to silicon-poor lava flows. Regions of high silicon, shown in red and yellow, may result from rocks that formed with higher silicon content or from weathering processes that concentrated silicon in these regions. The white sections at the top and bottom of the map represent regions of the planet where obtaining concentration values for silicon is more difficult due to large amounts of water ice in the soil. The locations of the five successful lander missions are marked: Viking 1 (VL1), Viking 2 (VL2), Pathfinder (PF), Spirit at Gusev (G), and Opportunity at Meridiani (M). More information about this map can be found in the recent article by Boynton, W. V., et al. (2007), Concentration of H, Si, Cl, K, Fe, and Th in the low- and mid-latitude regions of Mars . You may obtain full resolution versions of this and other elemental maps at http://grs.lpl.arizona.edu/specials/.

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