[meteorite-list] Origin of Tektites

[Aubrey Whymark]

Mike

Artemevia papers have a lot on ejection angles. They conclude a 30 degree angle is optimum - so agreed - too oblique may not be good (although I suspect the Australasian event was more oblique than 30 degrees).

Regards, Aubrey


--- On Sat, 11/9/10, Michael Fowler <mqfowler at mac.com> wrote:

> From: Michael Fowler <mqfowler at mac.com>
> Subject: Re: [meteorite-list] Origin of Tektites
> To: meteorite-list at meteoritecentral.com
> Cc: "Michael Fowler" <mqfowler at mac.com>
> Date: Saturday, 11 September, 2010, 16:27
> Aubrey,
> 
> Keep working on your book, I'm sure there is a lot of
> interest in the subject, especially for a source takes all
> the best research out there and puts it together in a
> interesting and unified narrative.
> 
> Question:
> 
> > Oblique impacts and those impacting silica rich
> sedimentary rock favor tektite production. Tektites are
> melted and distally ejected terrestrial rock. 
> 
> 
> I had not heard that Oblique impacts favor tektite
> production, in fact I thought that high velocity
> perpendicular impacts favored the vaporized ejecta plume
> reaching outside the earth's atmosphere.  Could you
> elaborate on the evidence favoring oblique impacts, or
> provide a link to any research on the topic?
> 
> Thanks,
> 
> Mike Fowler
> Chicago
> 
> > Hi 
> > 
> > I'm not sure if I qualify as a tektite 'expert', but I
> have done a lot of private research. I am working on a book
> which is 2/3 complete - hopefully 2011, but I struggle to
> find the time with my work and new baby! 
> > 
> > I have an extensive reference list on my website
> www.tektites.co.uk. This includes links to many freely
> downloadable papers. I've not updated the site recently so
> some material is out of date. Also I am working on an even
> more extensive reference list right now. 
> > 
> > Since the 1970's there has been no doubt as to the
> origin of tektites. They are formed by an asteroid or comet
> impacting with the Earth. The tektites are formed in the
> very earliest stages of impact. Oblique impacts and those
> impacting silica rich sedimentary rock favor tektite
> production. Tektites are melted and distally ejected
> terrestrial rock. 
> > 
> > North American tektites (Bediasites and Georgiaites)
> come from the Chesapeake Crater. 
> > 
> > Moldavites come from the Ries crater, Germany 
> > 
> > Ivory Coast tektites come from Bosumtwi Crater in
> Ghana. 
> > 
> > Australasian tektites come from an undiscovered crater
> most likely in the Bay of Tonkin between Vietnam and China,
> perhaps closer to Vietnam. It will be discovered and there
> is no doubt in this. 
> > 
> > Hope this helps, 
> > 
> > Aubrey 
> > www.tektites.co.uk 
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