[meteorite-list] New Argentine Impact Glasses and Possible Buried Crater Reported.

From: Paul Heinrich <lenticulina1_at_meteoritecentral.com>
Date: Thu Apr 22 10:22:38 2004
Message-ID: <20030613134520.75328.qmail_at_web21401.mail.yahoo.com>

A paper reported the existence of 3 new impact
glasses and a possibly buried crater from the
Pampas of Argentina.

The abstract is;

Schultz, Peter H., Zarate, M., Hames, W.E.,
King, J., Heil, C., Koeberl, C., Renne, P.R.,
and Blasi, A., 2002, Argentine Impact Record.
Geological society of America, 2002 Denver
Annual Meeting (October 27-30, 2002) Paper
No. 178-6, Session No. 178, Impact Stratigraphy

http://gsa.confex.com/gsa/2002AM/finalprogram/abstract_44460.htm
http://gsa.confex.com/gsa/2002AM/finalprogram/session_2932.htm

Five horizons containing impact glass have
been reported from the Pampeano Formation
of Argentina.

-------

Impact Glass Layer - Age

Rio Cuarto impact glass - 5,000 BP

unnamed impact glass (near Necochea) - 460,000 BP

Mar del Plata impact glass - 3.3 million BP

unnamed (Buenos Aires Province) impact glass - 5.2
million BP

unnamed impact glass (near Chasico) - 10.1 million BP

----
In addition, associated with the oldest impact 
glass, they reported "drainage patterns" that
"delineate a concentric structure 15 km in 
diameter and may represent the buried impact 
crater."
Other URLs
Pocketful of glass leads geologist to site 
of ancient, powerful collision
http://www.brown.edu/Administration/George_Street_Journal/vol23/23GSJ14a.html
ANALOGS OF MARTIAN SURFACE COMPONENTS: 
DISTINGUISHING IMPACT GLASS FROM VOLCANIC GLASS.
B. J. Thomson and P. H. Schultz
Lunar and Planetary Conference XXXIV (2003)
http://www.lpi.usra.edu/meetings/lpsc2003/pdf/1416.pdf
Yours,
Paul
Baton Rouge, LA
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Received on Fri 13 Jun 2003 09:45:20 AM PDT