us.2u Posted November 28, 2004 Share Posted November 28, 2004 Thank-you Ophiolite so now we are back to square 1 it seems like our dinos could not survive the nuclear winter? & proberly other causes as well but the main eradication the meteorite of 65 million years ago has iradium.. which has been found worldwide anything to do with this extinction of dinosaurs, I don't really know do you? us.2u Link to comment Share on other sites More sharing options...
Ophiolite Posted November 28, 2004 Share Posted November 28, 2004 Iridium is comparatively rare on earth and comparatively common in meteorites. In the thin layer of rock that marks the KT boundary there is a high concentration of Iridium. This is what first gave the Agaziz (father and son) the idea of a major impact at the end of the Cretaceous. Researchers began to look for possible sites and two geologists, working for Pemex the Mexican national oil company spotted the Chicxulub site with 3-D seismic. Edited to correct my abominable spelling of Chicxulub. (Popocatapetl is easier to climb than pronounce!) Link to comment Share on other sites More sharing options...
Artorius Posted November 28, 2004 Share Posted November 28, 2004 But iridium is also present below the earths mantle.So volcanic activity on a large scale could also account for this concentration.So a meteorite hit together with volcanic activity would be quite a harsh environment to be living in Link to comment Share on other sites More sharing options...
us.2u Posted November 28, 2004 Share Posted November 28, 2004 Between us all we might've cracked it... "The end of Jurassic life" could this iradium comtaminate the dinosaurs food resources as in poisioning them or wrecking the liklihood of re-germinating thus shortenening the food resources for our dinosaurs? Link to comment Share on other sites More sharing options...
Ophiolite Posted November 28, 2004 Share Posted November 28, 2004 Between us all we might've cracked it... "The end of Jurassic life" could this iradium comtaminate the dinosaurs food resources as in poisioning them or wrecking the liklihood of re-germinating thus shortenening the food resources for our dinosaurs?No. Nice thought. Link to comment Share on other sites More sharing options...
Ophiolite Posted November 28, 2004 Share Posted November 28, 2004 But iridium is also present below the earths mantle.So volcanic activity on a large scale could also account for this concentration.So a meteorite hit together with volcanic activity would be quite a harsh environment to be living inAnd the Deccan trap flood basalts were within 1m.y.+/- of the KT boundary, which is why some authorities (especially those geologists who resent astronomers messing with their speciality with nasty bolides) believe it was them and not the impact that did it.As noted above it is likely that a combination of circumstances was at work. Link to comment Share on other sites More sharing options...
swansont Posted November 28, 2004 Share Posted November 28, 2004 But iridium is also present below the earths mantle.So volcanic activity on a large scale could also account for this concentration. Not if you find the iridium in non-volcanic deposits. Link to comment Share on other sites More sharing options...
Artorius Posted November 29, 2004 Share Posted November 29, 2004 Its not restricted to volcanic deposits say around the actual volcano, in confirmation of post 78 iridium is still being released and settling onto the earths surface today. Link to comment Share on other sites More sharing options...
us.2u Posted November 29, 2004 Share Posted November 29, 2004 Well I believe you're all correct so I see the whole picture something like this...The meteorite impacting in Mexico causing a long nuclear winter volcanic excitement proberly earthquakes as well a most hostile & "uninhabitable enviroment" also I guess our Dinos being reptiles would only feel comfortable in tropical conditions not freak winters I don't think this can be far out & thank you everyone for showing your interest..us.2u Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now