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Author Topic:   Too Many Meteor Strikes in 6k Years
JonF
Member (Idle past 158 days)
Posts: 6174
Joined: 06-23-2003


Message 301 of 304 (213004)
06-01-2005 9:04 AM
Reply to: Message 299 by peaceharris
05-30-2005 1:03 AM


Iridium distribution
I think that both you and Edge are wrong. The amount of iridium would only be simply related to distance from the crater if the iridium was distributed by simple ballistic trajectories (complicated by the spherical shape of the Earth). However, it seems certain that the iridium was suspended in the atmosphere for some time, carried all over the Earth by jet streams and what not, and pretty well uniformly distributed over the globe. Interestingly, the first paper I dug up says that the iridium is homogenous but diluted near the impact crater, because of being mixed with the high volume of sedient in the Gulf of Mexico. See Distribution of Chicxulub ejecta at the Cretaceous-Tertiary boundary.

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 Message 299 by peaceharris, posted 05-30-2005 1:03 AM peaceharris has not replied

AdminBrian
Inactive Member


Message 302 of 304 (213007)
06-01-2005 9:05 AM


Just a reminder about the 300 message implosion!!

NosyNed
Member
Posts: 8996
From: Canada
Joined: 04-04-2003


Message 303 of 304 (213100)
06-01-2005 1:18 PM


Get your messages in before it is too late!
New Scientist | Science news and science articles from New Scientist
A comet with a non-zero impact probability. (A much lower one than the figures given in this article though, I think).

AdminJar
Inactive Member


Message 304 of 304 (213110)
06-01-2005 1:22 PM


Closing this down to avoid possible impact
I will be in the basement if anyone needs me.

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