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Re: Carbonates and CI Chondrites
martinh@isu.edu (Martin Horejsi) wrote on 1998-February-8:
[...]
>I have heard of the similarity of carbonaceous chondrites, namely Orgueil
>and Allende, to the composition of our sun. In your excellent posting, you
>even note: "By measuring the elemental abundance in the Sun, and compare
>it with CI chondrites, they plot very near one another." However when I
>lookup the Sun's composition, Kaufmann (1988), lists it as (by weight) 75%
>Hydrogen, 24% Helium, and 1% all other elements, but has a density of
>1.41g/cm^3. What is the relationship (or how can a relationship exist)
>between carbonaceous chondrites to the sun, and to asteroids, and to other
>chondrites including E's and ordinary ones if they themselves are not
>specifically all related in the same way?
Dodd's Thunderstones and Shooting Stars, p. 32, describes this pretty
well.
If one ignores the gases (which we would not expect to find in
chondrites) and then plots the atomic ratios with respect to silicon
[there follows a plot of Ti, K, P, Na, Ni, Ca, Al, Fe, Si, Mg, and S]
there is precise agreement between Orgueil Chondrites and the Sun.
Dodd writes
'... as long as we restrict the comparison to elements that remain
solid to temperatures of a few hundred degrees Celsius, chondrites in
general and one variety in particular have almost solar compositions'.
--
Jim Hurley
Arachnaut's Lair
http://www.arachnaut.org/ >
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