The Oldest Rock In The World Tells Us A Story

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PostSat Jan 12, 2013 8:54 pm » by Mozi!!a


Image


What is this? It's a zircon, from the Persian word "zargun" meaning "golden colored," an extremely durable mineral found all over the world. This one turned up in a dry, hilly region of Western Australia. It was sitting inside a larger rock, and when scientists checked, it turns out this little grain formed around 4.4 billion years ago. That would make it the oldest rock we've ever seen on this planet, old enough to know secrets about early Earth, old enough to tell us a little something about how life started here.

After all, this planet, geologists say, is only 4.5 or 4.6 billion years old. So this little grain has been around since almost the beginning — but not quite.

It's about 150 to 300 million years short. No surface rocks survive from that earliest time because back then, we figure, volcanoes were blowing up constantly, rocks were being heated, vaporized, melted, pulled down into the earth. There were oceans of burning lava everywhere; asteroids were crashing in from above, setting the air on fire. In the beginning, Earth was not a nice place.


:rtft:

http://www.npr.org/blogs/krulwich/2013/ ... n=20130111

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PostSat Jan 12, 2013 10:06 pm » by The57ironman


Mob 2,0 wrote:Image

......it turns out this little grain formed around 4.4 billion years ago.

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....i thought you couldn't carbon date a rock.. :headscratch:

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it's long on new and it's short on order

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PostSun Jan 13, 2013 12:31 am » by Marcydare


Err..... sorry, I thought this was a thread about the Rolling Stones. :alien51:



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