Early chemical history of the solar system
Journal Article
·
· Rev. Geophys. Space Phys., v. 12, no. 1, pp. 71-101
The extreme antiquity and lack of evidence for sigrificant chemical processing of the chondritic meteorites since they were formed suggest the possibility that their chemistry and mineralogy may have been established during the condensation of the solar system. By using equilibrium thermodynamics, the sequence of condensation of mineral phases from a cooling nebula of solar composition has been calculated. Applying the predictions of these theoretical medels suggests that (1) the chemistry and mineralogy of Ca-Alrich inclusions in C2 and C3 chondrites were established during condensation at temperatures >1300 deg K; (2) fractionation of such inclusions is necessary to account for the refractory element depletions of ordinary and enstatite chondrites relative to the cartbonaceous chondrites; (3) the metal-silicate fractionation in ordinary chondrites took place in the nebula at T < 1000 deg K and P/sub tot/ ~ 10/sup -1/ atm; (4) the volatile element depletion of C2 and C3 chondrites relative to C1 chondrites took place during chondrule formation; (5) the most volatile elements are depleted in ordinary chondrites because they accreted before these elements were totally condensed; and (6) many chemical features of planetary rare gases and organic material in carbonaceous chondrites could have been established during condensation. Chemical fractionation during condensation may also be responsible for the heterogeneous accumulation of the Earth, the rerractory element enrichment of the Moon, and the varying Fe/Si ratios of the terrestrial planets. (auth)
- Research Organization:
- Univ. of Chicago
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-29-022020
- OSTI ID:
- 4324075
- Journal Information:
- Rev. Geophys. Space Phys., v. 12, no. 1, pp. 71-101, Journal Name: Rev. Geophys. Space Phys., v. 12, no. 1, pp. 71-101; ISSN RGPSB
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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