Other
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...9436759b&link_type=abstract
Unknown
Other
Chemical Composition, Chondrites, Compressed Gas, Free Energy, Silicates, Silicon, Temperature Dependence, Thermodynamic Properties, Condensates, Enstatite, Pyrometallurgy, Silicon Dioxide
Scientific paper
Condensates from a gas of 'solar' composition were calculated to investigate the origins of EL6 chondrites using a free energy minimization program with a data base for the thermodynamic properties of multicomponent molten silicates as well as for other liquid solids, solid solutions and gaseous species. Because of high volatility of silicon and silica, the high silicon content of metal (2.6 mole percent) can only be produced at pressures 10-2 atm at temperatures above 1475 K. At 100-500 atm, a liquid silicate phase crystallizes at a temperature where the silicon content of the metal, ferrosilite content of the enstatite and albite concentration in the plagioclase are close to measured values. In pyrometallurgy, liquid silicates are catalysts for reactions in which Si-O-Si bridging bonds are broken or formed. Thus, one attractive mode for freezing in the compositions of these three phases is disappearance of fluxing liquid. If the plagioclase can continue to react with the nebula without a liquid phase, lower pressures of 10-1 to 1 atm might be possible. Even if the nebula is more reducing than a solar gas, the measured properties of EL6 chondrites might be reconciled with only slightly lower pressures (less than 3 times lower). The temperatures would be about the same as indicated in our calculations since the product of the silicon content of the metal and the square of the ferrosilite content of the enstatite constitute a cosmothermometer for the mineral assemblage in EL6 chondrites.
Blander Milton
Eriksson G.
Pelton Arthur
Unger Laura
No associations
LandOfFree
A possible origin of EL6 chondrites from a high temperature-high pressure solar gas does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A possible origin of EL6 chondrites from a high temperature-high pressure solar gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A possible origin of EL6 chondrites from a high temperature-high pressure solar gas will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1509681