| タイトル | Sulfur Isotopes in Gas-rich Impact-Melt Glasses in Shergottites |
| 本文（外部サイト） | http://hdl.handle.net/2060/20100003465 |
| 著者（英） | Rao, M. N.; Huth, J.; Nyquist, Laurence E.; Sutton, S. R.; Hoppe, P. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2010-01-01 |
| 言語 | eng |
| 内容記述 | Large impact melt glasses in some shergottites contain huge amounts of Martian atmospheric gases and they are known as gas-rich impact-melt (GRIM) glasses. By studying the neutron-induced isotopic deficits and excesses in Sm-149 and Sm-150 isotopes resulting from Sm-149 (n,gamma) 150Sm reaction and 80Kr excesses produced by Br-79 (n,gamma) Kr-80 reaction in the GRIM glasses using mass-spectrometric techniques, it was shown that these glasses in shergottites EET79001 and Shergotty contain regolith materials irradiated by a thermal neutron fluence of approx.10(exp 15) n/sq cm near Martian surface. Also, it was shown that these glasses contain varying amounts of sulfates and sulfides based on the release patterns of SO2 (sulfate) and H2S (sulfide) using stepwise-heating mass-spectrometric techniques. Furthermore, EMPA and FE-SEM studies in basaltic-shergottite GRIM glasses EET79001, LithB (,507& ,69), Shergotty (DBS I &II), Zagami (,992 & ,994) showed positive correlation between FeO and "SO3" (sulfide + sulfate), whereas those belonging to olivine-phyric shergottites EET79001, LithA (,506, & ,77) showed positive correlation between CaO/Al2O3 and "SO3". |
| NASA分類 | Geophysics |
| レポートNO | JSC-CN-19563 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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