Hi Rob,
...nucleosynthesis...
Ah, one of my favorite words. I try to use it at least once a week :-)
-Walter
(give-me-some-hydrogen-atoms-and-I-can-create-any-heavier-element-up-to-iron)
Branch
----- Original Message -----
From: "Matson, Robert D." <robert.d.mat...@saic.com>
To: "meteoritelist" <meteorite-list@meteoritecentral.com>
Sent: Friday, March 26, 2010 5:31 PM
Subject: [meteorite-list] No nickel-free iron meteorites
Hi Carl,
Alan wrote:
"Please note that volumetrically, the amount of low-Ni metallic Fe is
trivial, far less than 0.1% of a typical chondrite."
You replied:
".1% is a relative term. Earth may be only a fraction of the size of
Artares [Antares] but, it is still a pretty big rock."
I don't think you're quite absorbing what Dr. Rubin is saying. There is
no
natural solar system mechanism that can separate iron from nickel in
macroscopic quantities. So if you find a lump of iron on earth that
doesn't
have nickel in it, it originated here. It is not a question of there
being
room for reasonable doubt. It simply cannot happen. The physics of
nucleosynthesis, cosmochemistry, and entropy do not allow it.
Best,
Rob
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