[meteorite-list] Ordovician Meteorites...was New or maybe oldQUESTION???

From: star-bits at tx.rr.com <star-bits_at_meteoritecentral.com>
Date: Mon, 5 May 2008 12:01:28 -0400
Message-ID: <9482774.589641210003288824.JavaMail.root_at_cdptpa-web28-z01>

---- "Sterling K. Webb" <sterling_k_webb at sbcglobal.net> wrote:

<And all tektites have an original Rb/Sr melt date of 440-480 million years
ago. All just a coincidence, of course... >

Where does this information come from? It does not seem even remotely possible. No tektites are this old. All tektites originated as melted terrestrial material. How do you postulate a "melt date" which precedes a later melting? You can't even get a date by backing out the Rb/Sr from the known terrestrial impacted material because the SE Asia impact site is not known.

Additionally this means that all tektite forming impacts were L chondrites, no irons, no H chondrites, no carbonaceous etc. This is certainly possible but seems unlikely. Whether a tektite is formed depends on the impacted material and not on the composition of the impactor.

 --
Eric Olson
7682 Firethorn Dr
Fayetteville, NC 28311

http://www.star-bits.com
Received on Mon 05 May 2008 12:01:28 PM PDT