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Possible sources of H2 to H2O enrichment at evaporation of parent chondritic materialOne of the results obtained from thermodynamic simulation of recondensation of the source chondritic material is that at 1500-1800 K it's possible to form iron-rich olivine by reaction between enstatite, metallic iron and water vapor in the case of (H2O)/(H2) approximately equal to 0.1. This could be reached if the gas depletion in hydrogen is 200-300 times relative to solar abundance. To get this range of depletion one needs some source material more rich in hydrogen than the carbonaceous CI material which is the richest in volatiles among chondrites. In the case of recondensation at impact heating and evaporation of colliding planetesimals composed of CI material, we obtain insufficiently high value of (H2)/(H2O) ratio. In the present paper we consider some possible source materials and physical conditions necessary to reach gas composition with (H2)/(H2O) approximately 10 at high temperature.
Document ID
19940011904
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Makalkin, A. B.
(Academy of Sciences (USSR) Moscow, Ussr)
Dorofeyeva, V. A.
(Academy of Sciences (USSR) Moscow, Ussr)
Vityazev, A. V.
(Academy of Sciences (USSR) Moscow, Ussr)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M
Subject Category
Astrophysics
Accession Number
94N16377
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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