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Author Topic:   Murchison Meteor Questions
Coragyps
Member (Idle past 734 days)
Posts: 5553
From: Snyder, Texas, USA
Joined: 11-12-2002


Message 12 of 216 (421785)
09-14-2007 1:32 PM


Putting Murchison on the shelf for just a moment, let's have a peek at the Tagish Lake meteorite instead. It was seen to fall, and the first bits were collected from atop the ice of a frozen lake within a week.
The Tagish Lake meteorite fell last year on a frozen lake in Canada and may provide the most pristine material of its kind. Analyses have now shown this carbonaceous chondrite to contain a suite of soluble organic compounds (~100 parts per million) that includes mono- and dicarboxylic acids, dicarboximides, pyridine carboxylic acids, a sulfonic acid, and both aliphatic and aromatic hydrocarbons. The insoluble carbon exhibits exclusive aromatic character, deuterium enrichment, and fullerenes containing "planetary" helium and argon. The findings provide insight into an outcome of early solar chemical evolution that differs from any seen so far in meteorites.
One of those pyridine carboxylic acids is more commonly called niacin: the stuff that's in One-A-Day vitamins.

  
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