+ Visit NASA.gov + Contact NASA   + Home Collection > NASA  Author > Nishiizumi, K.  NASA Center > NASA (non Center Specific)  Publication Year > 2001-2010 > 2001  Subject > J-L > Lunar And Planetary Science And Exploration  Availability Options > Order From CASI > CD-ROM, DVD, Print  Item/Media Type > Conference Paper  Note: Start a new navigation search by selecting a link above     Previous Record | Next Record + Back to Results   + Printer Friendly Title: Surficial Studies of Mars Using Cosmogenic Nuclides Author(s): Nishiizumi, K. Abstract: Cosmogenic nuclides (CNs) are produced by cosmic-ray nuclear interactions with target nuclei in rocks, soils, ice, and the atmosphere. Cosmogenic nuclides have been widely used for investigation of solar system matter for several decades. Stable nuclides, such as He-3, Ne-21, and Ar-38, are built up over time as the surface is exposed to cosmic rays. The concentrations of cosmogenic radionuclides, such as Be-10, Al-26, and C-14 also build up with exposure time but reach saturation values after several half-lives. Especially since the development of accelerator mass spectrometry (AMS), CNs in terrestrial samples have been routinely used for geomorphic studies such as glaciation, surface erosion, and tectonics, and studies of atmospheric and ocean circulation. Cosmogenic nuclides on Mars will be able to answer questions of exposure ages, erosion rates, tectonic events, and deposition rates of sediments and/or volatiles. The concentrations of cosmogenic stable nuclides give the integrated exposure time of the rock/mineral, and the activities of radionuclides give recent records for times back as long as a few half-lives. NASA Center: NASA (non Center Specific) Publication Date: 2001 Document Source: CASI No Digital Version Available: Go to Tips On Ordering Document ID: 20010122749 Publication Information: Field Trip and Workshop on the Martian Highlands and Mojave Desert Analogs, 47-48, Number of Pages = 2 Price Code: A01 Keywords: COSMIC RAYS; NUCLEAR INTERACTIONS; NUCLIDES; MARS (PLANET); MARS ATMOSPHERE; MARS SURFACE; EXPOSURE; EROSION; TECTONICS; DEPOSITION; SEDIMENTS; Accessibility: Unclassified; No Copyright; Unlimited; Publicly available; Updated/Added to NTRS: 2004-11-03 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007