| タイトル | Aqueous Alteration Mineralogy in CM Carbonaceous Chondrites |
| 著者（英） | Mikouchi, T.; Zolensky, M.; Nakamura, K.; Chokai, J.; Le, L.; Miyamoto, M.; Monkawa, A.; Koizumi, E. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2004-01-01
2004 |
| 言語 | eng |
| 内容記述 | Iron-nickel sulfides are found in most or all solar system environments, and are probably the only minerals found in all extraterrestrial materials on hand. Despite the ubiquity, they have not received the attention they deserve. The most common Fe-Ni sulfides in chondrites are troilite (FeS), pyrrhotite (Fe1- XS) and pentlandite (Fe,Ni)9S8. Troilite is believed to have resulted from sulfidation of metal (Fe-Ni) grains in an H2Scontaining environment. Pyrrhotite is produced when friable troilite grains, which are exfoliated from the metal nucleus, are submitted to continued sulfidation [1]. Some asteroids are known to have experienced aqueous alteration, forming products including new generations of sulfides (pyrrhotite and pentlandite). Pentlandite in particular is known to form during such alteration [1]. However, experimental work by Lauretta has indicated that pentlandite may also have been formed during the initial sulfidation process [2], due to the faster diffusion rate of nickel into the forming sulfide, as compared to iron. Finally, there is considerable evidence [1,3&4] for a family of phases intermediate between pyrrhotite and pentlandite, following the trend of the high temperature monosulfide solid solution [5], something not encountered in terrestrial rocks. |
| NASA分類 | Lunar and Planetary Science and Exploration |
| レポートNO | JSC-CN-8366 |
| 権利 | Copyright, Distribution under U.S. Government purpose rights |
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