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- W2077886905 abstract "The calculated ferrous iron content of a silicate liquid at equilibrium with solar gas approximately equals the Fe2+ content of chondrules in a primitive chondrite (Renazzo). This points to a relationship between chondrules and the primordial solar nebula, and supports the proposition that chondrules are original (liquid) condensations from the nebula, predating the planets. Basic silicate liquids would be stable in an undifferentiated solar gas only at 102−104 atmospheres total pressure and ∼2000°K. Recent theoretical studies of the temperature-hydrostatic pressure history of a contracting model protosun do not yield such a combination of high pressure and moderate temperature. However, chemical fractionation of the nebular gas or transient pressures associated with T Tauri-like mass ejection could make the condensation of liquid droplets (chondrules) possible. The postulated sequence of events by which chondrules and the various classes of chondrites were formed is summarized in Section 12. By the time planets accreted, a number of processes would probably have acted to fractionate Fe, O, and S with respect to Si: chemical fractionation prior to condensation; chondrule-dust, metal-silicate, and solid-gas fractionations after condensation; and incomplete reaction of solid with gas phase at the time of accretion. These effects can account for Prior's law and for chemical differences between the various chondrite classes." @default.
- W2077886905 created "2016-06-24" @default.
- W2077886905 creator A5059574498 @default.
- W2077886905 date "1963-01-01" @default.
- W2077886905 modified "2023-10-03" @default.
- W2077886905 title "On the origin of chondrules and chondrites" @default.
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- W2077886905 doi "https://doi.org/10.1016/0019-1035(63)90013-7" @default.
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