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Migration Processes and Volatiles Inventory to the Inner PlanetsComets and asteroids colliding with the terrestrial planets can deliver volatiles and organic or prebiotic compounds to the planets, thereby depositing on the planets the fundamental building-blocks for life. The inner planets contain heavier and cosmically less abundant elements in an iron-silicate matrix than the giant planets. This can be caused by the following three mechanisms: uneven fractionation and condensation in the accretionary disk; unequal degree of degassing of the composed matter; and heterogeneous accretion. Asteroid-size bodies consisting of the last low-temperature condensates (similar to most primitive chondritic meteorites, and enriched in hydrated silicates and trapped gases) are believed to have fallen onto the inner planets during the process of the giant planets formation. The relative contribution of either endogenous (i.e. outgassing) or exogenous (i.e. asteroid/comet collisions) sources is difficult to assess, although it is constrained by the pattern of noble gas abundances in the planetary atmospheres.
Document ID
20040059600
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Marov, M. Y.
(Academy of Sciences (USSR) Moscow, USSR)
Ipatov, S. I.
(George Mason Univ. Fairfax, VA, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Publication Information
Publication: Lunar and Planetary Science XXXV: Asteroids, Meteors, and Comets
Subject Category
Lunar And Planetary Science And Exploration
Funding Number(s)
CONTRACT_GRANT: RFBR-02-02-16165
CONTRACT_GRANT: RFBR-01-02-17540
CONTRACT_GRANT: INTAS-00-240
CONTRACT_GRANT: NAG5-10776
Distribution Limits
Public
Copyright
Public Use Permitted.
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