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|a (TOE)ost10144532
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|a (TOE)10144532
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|a E 1.99:anl/cmt/pp--73161
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|a E 1.99:anl/cmt/pp--73161
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|a A possible origin of EL6 chondrites from a high temperature-high pressure solar gas
|h [electronic resource]
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| 260 |
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|a Washington, D.C. :
|b United States. Dept. of Energy ;
|a Oak Ridge, Tenn. :
|b distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
|c 1994.
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| 300 |
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|a 13 p. :
|b digital, PDF file.
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| 336 |
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|a text
|b txt
|2 rdacontent.
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| 337 |
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|a computer
|b c
|2 rdamedia.
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| 338 |
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|a online resource
|b cr
|2 rdacarrier.
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|a Published through the Information Bridge: DOE Scientific and Technical Information.
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|a 05/01/1994.
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|a "anl/cmt/pp--73161"
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|a "DE94010467"
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|a Blander, M.; Eriksson, G.; Unger, L.; Pelton, A.
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| 513 |
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|a Topical;
|b 12/31/1994.
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|a Condensates from a gas of ̀̀solar̀̀ 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 liquids solids, solid solutions and gaseous species. Because of high volatility of silicon and silica, the high silicon content of metal (2.6 mole %) 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 3X 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.
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| 536 |
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|b W-31109-ENG-38.
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| 650 |
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|a Silica.
|2 local.
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| 650 |
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|a Pressure Dependence.
|2 local.
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| 650 |
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|a Enstatite.
|2 local.
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| 650 |
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|a Temperature Dependence.
|2 local.
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| 650 |
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|a Chemical Composition.
|2 local.
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| 650 |
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|a Silicon.
|2 local.
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| 650 |
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|a Anorthosites.
|2 local.
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| 650 |
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|a Solar Nebula.
|2 local.
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| 650 |
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|a Origin.
|2 local.
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| 650 |
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|a Chondrites.
|2 local.
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| 650 |
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|a Classical And Quantum Mechanics, General Physics.
|2 edbsc.
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| 710 |
2 |
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|a Argonne National Laboratory.
|4 res.
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| 710 |
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|a United States.
|b Department of Energy.
|4 spn.
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| 710 |
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|a United States.
|b Department of Energy.
|b Office of Scientific and Technical Information.
|4 dst.
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| 856 |
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|u http://www.osti.gov/servlets/purl/10144532-To1caR/native/
|z Online Access
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| 907 |
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|a .b59467083
|b 03-06-23
|c 05-25-10
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| 998 |
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|a web
|b 05-25-10
|c f
|d m
|e p
|f eng
|g dcu
|h 2
|i 1
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|a Information bridge
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|s 39c23cdc-f784-5559-9e13-24b4b5c8b616
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| 952 |
f |
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|p Can circulate
|a University of Colorado Boulder
|b Online
|c Online
|d Online
|e E 1.99:anl/cmt/pp--73161
|h Superintendent of Documents classification
|i web
|n 1
|
