NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Sulfur Isotopes in Gas-rich Impact-Melt Glasses in ShergottitesLarge 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".
Document ID
20100003465
Acquisition Source
Johnson Space Center
Document Type
Extended Abstract
Authors
Rao, M. N. (Jacobs Technologies Engineering Science Contract Group Houston, TX, United States)
Hoppe, P. (Max-Planck-Inst. fuer Chemie Mainz, Germany)
Sutton, S. R. (Max-Planck-Inst. fuer Chemie Mainz, Germany)
Nyquist, Laurence E. (NASA Johnson Space Center Houston, TX, United States)
Huth, J. (Max-Planck-Inst. fuer Chemie Mainz, Germany)
Date Acquired
August 25, 2013
Publication Date
January 1, 2010
Subject Category
Geophysics
Report/Patent Number
JSC-CN-19563
Distribution Limits
Public
Copyright
Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available