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Cracks In The Foundation: Fundamental Geological Assumption Relating To Planet Earth Not Quite True

Chondritic meteorites have a similar chemical composition to the sun and are therefore reliable witnesses as to what the solar nebula, from which the planets formed, was composed of. This can be used to deduce what the Earth consists of chemically. However, ETH Zurich researchers have now discovered that strictly speaking this fundamental geological assumption is not true. picked by AutumnLotus 2 years ago

tags fundamental geological assumption planet earth chondritic

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21	rambler

2 years ago

As far as the scientists are concerned, there are two possibilities: the first is that the matter in the solar nebula ceased to be homogenous even before the planets formed, a theory which astrophysicists consider perfectly plausible.

... and so do I, a non-astrophysicist but a renowned geological commonsensalist.

The second explanation assumes that a crust formed on the first planetary bodies, the so-called planetesimals. In the course of this, the crusts and mantles of these bodies each exhibited a different composition. According to this theory, when the planets collided with one another their crust was blown away.

Slightly less plausible (tricky to form a crust on a small body with low gravity), but not impossible.

Anyway, I do believe that planet Earth is part of the solar system and was derived from it, even without those two reasons to explain isotopic differences.

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