| タイトル | Solubility of Sulfur in Shergottitic Silicate Melts Up to 0.8 GPA: Implications for S Contents of Shergottites |
| 本文（外部サイト） | http://hdl.handle.net/2060/20090006971 |
| 著者（英） | Righter, K.; Pando, K.M.; Danielson, L. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2009-01-01 |
| 言語 | eng |
| 内容記述 | Shergottites have high S contents (1300 to 4600 ppm; [1]), but it is unclear if they are sulfide saturated or under-saturated. This issue has fundamental implications for determining the long term S budget of the martian surface and atmosphere (from mantle degassing), as well as evolution of the highly siderophile elements (HSE) Au, Pd, Pt, Re, Rh, Ru, Ir, and Os, since concentrations of the latter are controlled by sulfide stability. Resolution of sulfide saturation depends upon temperature, pressure, oxygen fugacity (and FeO), and magma composition [2]. Expressions derived from experimental studies allow prediction of S contents, though so far they are not calibrated for shergottitic liquids [3-5]. We have carried out new experiments designed to test current S saturation models, and then show that existing calibrations are not suitable for high FeO and low Al2O3 compositions characteristic of shergottitic liquids. The new results show that existing models underpredict S contents of sulfide saturated shergottitic liquids by a factor of 2. |
| NASA分類 | Geophysics |
| レポートNO | JSC-17662 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
|
