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Re: (meteorobs) Iridium from Impacts vs Volcanism
C-T extinction was probably caused by a 10 km asteroid
that hit what is today the Yucatan peninsula. It dug out
a 240 km crater.
But what killed the dinosaurs was a unique chain reaction,
not only the hit itself.
I could go on with the details, but this is a meteor mailing
list, not a dinosaur/fossil one.
Clear skies!
Jure A.
----------
> Od: Asaf S.-T. <dark_observer@yahoo.com>
> Za: meteorobs@jovian.com
> Zadeva: Re: (meteorobs) Iridium from Impacts vs Volcanism
> Datum: 25. julij 1999 16:31
>
>
>
> --- GeoZay@aol.com wrote:
> >
> > Both asteroid impacts on earth and Volcanoes give
> > off Iridium I understand.
> > Is there anything different about the Iridium from
> > both sources that would
> > enable one to say that it definitely came from an
> > asteroid or a volcanoe?
>
> I was once in a lecture on the topic. More Iridium is
> given (I think) from Asteriods, but that wasn't why
> they think that Dinosaurs got extinct from asteroids
> rather than volcanoes. Today scientists believe that
> the extinction was caused by an Asteroid. I don't
> remember the main reason, though.
> ===
> Asaf Shtull-Trauring, Amateur Astronomer
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