Water-Ammonia Ice Meteorites and/or Ammonia(UM)-Silicates from the Early Solar System: Possible Sources of Amino-Radicals of Life-Molecules on Earth and Mars?
Water and nitrogen on Earth and Mars cannot have been condensed in their present form at the present solar distance, condensation temperatures being very low. They either could have been carried from the outer system by comets or icy planetesimals (which could be parent bodies of icy meteorites), or condensed as constituents of silicates (nitrogen via ammonia in ammonia(um)-silicates: one group is with ammonium-ion, the other is crystal-ammonia in the silicate). After an overview of these possible sources we calculated the possibility of the survival of a mainly water-ice meteorite falling to Antarctica and the chance of its identification on the basis of its ammonia content. On the basis of thermodynamic data of ammonia(um)-silicates, we placed their probable condensational region in the Lewis-Barshay model of the solar system. We discuss the role of these two kinds of ammonia sources in the formation of the essentially water-ammonia symmetric amino acids on ancient Earth and Mars.
Lunar and Planetary Science Conference
- Pub Date:
- March 1997
- Meteoritic Composition;
- Mars Surface;
- Earth Surface;
- Antarctic Regions;
- Lunar and Planetary Exploration;
- ICE METEORITES ON ANTARCTICA;
- LIFE MOLECULES ON EARTH AND MARS;
- WATER-AMMONIA SYMMETRY FOR;
- WATER AND AMMONIA