[meteorite-list] Re: Did a Comet Swarm Kill the Dinosaurs?

From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Thu Apr 22 10:08:28 2004
Message-ID: <20020919230531.71576.qmail_at_web11607.mail.yahoo.com>

Hi all -

Thanks, Bob. It seems the first identifictation, the
one which accompanied the original announcement, and
which I pulled up on the net, was incorrect.

It still seems likely to me that in some extinction
level events we are looking at a billiard-ball type of
"combination shot", where a comet hit an asteroid and
sent it toward our planet.

Now if anyone had only run out the numbers for the
propagation of the Shoemaker-Levy 9/Jupiter impact
blast waves...

ep

--- Robert Verish <bolidechaser_at_yahoo.com> wrote:
> ------------------ Original Message
> -----------------
>
> [meteorite-list] Re: Did a Comet Swarm Kill the
> Dinosaurs?
> E.P. Grondine epgrondine_at_yahoo.com
> Sun, 15 Sep 2002 11:57:52 -0700 (PDT)
>
> Hi all -
>
> If my memory serves me, (I seem to remember that
> Pacific Ocean recovery was not a carbonaceous
> chondrite), that another comet besides this one may
> have hit an asteroid and sent it into the Earth
> would
> seem highly likely -
>
> About every 26 million years or so (the process is
> chaotic), when the Earth passes through the plane of
> our solar system, The Milky Way, there is an influx
> of
> comets and mass extinctions usually ensue.
>
> I don't know where we are in this impact-extinction
> process now, but perhaps the recent cometary impacts
> with the Earth amd the impact of Shoemaker-Levy 9
> with
> Jupiter may have some bearng on this -
>
> ep
>
> --- baalke_at_jpl.nasa.gov wrote:
> >
> >
>
<http://skyandtelescope.com/news/current/article_738_1.asp>
> >
> > Did a Comet Swarm Kill the Dinosaurs?
> > By David Tytell
> > Sky & Telescope
> > September 13, 2002
> >
> > In 1991 a modern scientific 'whodunit' was solved
> > when geologists identified a deeply buried,
> > 180-kilometer-wide crater in the Yucatán
> peninsula.
> ------------------------
>
> Does anyone know if there has been a more recent
> classification for this meteorite:
>
> Kyte F.T. (1998) A meteorite from the
> Cretaceous-Tertiary boundary. Nature 396, 237-239.
>
> Here is what Kyte (1998) said of the meteorite
> fragment that was found in the K-T boundary layer:
>
> "The fossil meteorite from DSDP Hole 576 appears to
> be
> from (1) a chondritic meteorite with (2) significant
> amounts of metal and sulphide (4-8%), (3) large
> inclusions [>200 um] of mafic minerals that also
> contained metal, and (4) 30-60% fine-grained matrix.
> The known meteorite groups that best fit these
> criteria could be the CV, CO, and CR carbonaceous
> chondrites."
>
> http://www.ess.ucla.edu/faculty/kyte/
>
>
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Received on Thu 19 Sep 2002 07:05:31 PM PDT