[meteorite-list] More on Muchison.....

From: Dark Matter <freequarks_at_meteoritecentral.com>
Date: Tue, 16 Feb 2010 12:24:06 -0700
Message-ID: <822da19a1002161124ke1f7fb9qff4bc7262f863355_at_mail.gmail.com>

Hi Shawn and all,

I've heard that a back-of-the-envelope calculation of the presolar
diamonds in meteorites could push the age limits to 10 billion years
ago. Not quite the Big Bang, but you can see it from there.

This number comes from the adding the age of our solar system (when
the diamonds were captured in our home material), to the age of a
star-centered solar system that could have created the diamonds in the
first place. Similar to a conceptual extension of the line in the
linked .pdf where it says, "For example, some small diamond crystals
in meteorites have high levels of heavy xenon isotopes that imply that
they originated from a supernova explosion."

Best,

Martin





On Tue, Feb 16, 2010 at 11:19 AM, Shawn Alan <photophlow at yahoo.com> wrote:
> Darren?and List
>
> Thank you for the read?up on Murchison meteorite on how scientist have identified over 14,000 compounds and counting. While we are on the topic of Murchison meteorite, I came?across an article on line that?points out these interesting facts and finds on the Murchison as?quoted from the article as follows....
>
> "Presolar grains are the oldest materials in the solar system," says Philipp Heck of the University of Chicago.
> "The ages of the grains clearly indicate that they are older than the solar system."
> ?But just how old?
> Heck and his colleagues isolated 22 grains from the Murchison meteorite, which is well-known for the
> organic material it contains, and measured how long the grains spent in interstellar space before winding up
> in our nascent solar system. The implied grain ages, reported in a recent paper of the Astrophysical Journal,
> appear to support a hypothesis that our solar system formed after a smaller satellite galaxy crashed into the
> Milky Way around 6 billion years ago."......
>
> "From the isotope abundances, the researchers estimate that the majority of grains spent between 3
> and 200 million years in interstellar space before falling into our molecular cloud some 4.6 billion
> years ago."
>
>
> Here is the link to the article I found on line.
> http://www.astrobio.net/pdffiles/news_3202.pdf
>
> and if your up for a read, here is an article on the age of?presolar SiC grains found in Murchison meteorite.
>
> http://presolar.wustl.edu/ref/Gyngard09b.pdf
>
> Enjoy
> Shawn Alan
>
>
>
> [meteorite-list] Murchison-- chock full o' stuffDarren Garrison cynapse at charter.net
> Tue Feb 16 00:25:30 EST 2010
>
>
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> http://news.discovery.com/space/meteorite-crammed-with-millions-of-organic-compounds.html
>
> Meteorite Crammed with 'Millions' of Organic Compounds
>
> By Ian O'Neill | Mon Feb 15, 2010 04:52 PM ET
>
> A meteorite that hit the town of Murchison, Australia, hasn't quit giving up its
> secrets.
>
> The Murchison meteorite is one of the most studied space rocks because many
> pieces were recovered after it was seen breaking up as it fell through the
> atmosphere in 1969. Approximately 100 kg of the carbonaceous chondrite was
> recovered.
>
> Carbonaceous chondrites are extremely important to scientists as they were
> formed from material that existed in the solar system's planet-forming disk of
> gas and dust. They are, quite literally, time capsules holding onto a 4 billion
> year old record of the birth of our solar system.
>
> In this case, the Murchison meteorite has given us another clue as to the
> abundance of organic chemicals that existed before the Earth had formed. In
> fact, this particular meteorite may have originated from material older than our
> sun.
>
> "We are really excited. When I first studied it and saw the complexity I was so
> amazed," said Dr Phillipe Schmitt-Kopplin, of the Institute for Ecological
> Chemistry in Neuherberg, Germany.
>
> "Meteorites are like some kind of fossil. When you try to understand them you
> are looking back in time."
>
> This new research made use of high resolution spectroscopic tools to identify
> the various compounds inside. Although this meteorite has provided scientists
> with vast amounts of information about specific carbon-based organics before,
> this was the first non-targeted study. In other words, the researchers weren't
> tracking down just one type of chemical, they did a broad analysis for all the
> chemicals it might contain.
>
> And what they found came as a shock, it appears that the primordial solar system
> probably had a higher chemical diversity than present-day Earth.
>
> In this study, 14,000 specific compounds including 70 amino acids were
> identified. But this number appears to be the tip of the iceberg; the meteorite
> probably contains millions of different organic compounds. More detailed
> analysis will now be carried out.
>
> But why is this important? To understand the diversity of organic chemicals that
> were floating around a primordial solar system will help us understand how life
> may have appeared on Earth. This particular chunk of carbonaceous chondrite
> drifted through the gas and dust of the early solar system, collecting all the
> basic organic chemistry from around that time, does that mean diverse organic
> chemistry is the "norm" for proto-planetary star systems?
>
> These organic compounds are known to exist on comets, asteroids and other
> planetary bodies, so what makes Earth the hothouse of life when everywhere else
> seems to be lifeless?
>
> If organic chemistry is ubiquitous, perhaps planning to "seed" young star
> systems with Earth-based life isn't such a good idea. The conditions for life
> may not be that rare after all.
>
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Received on Tue 16 Feb 2010 02:24:06 PM PST