[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: tektite coloration


-----Original Message-----
From: Calvin Shipbaugh <calvin@rand.org>
To: meteorite-list@meteoritecentral.com
<meteorite-list@meteoritecentral.com>
Date: Monday, June 21, 1999 5:26 PM
Subject: tektite coloration


Layered tektites contain many structures, both megascopic and microscopic,
that are impossible to explain in any impact melt event, but are exactly
what would be expected in the immediate vicinity (here, the pyroclastic
microtektite-like blobs of glass would be hot enough to weld together) of a
pyroclastic event on an atmosphere-free planetary body such as our moon.
LDglasses are all composed of microtektite-sized blobs of silica glass that
have been welded together.  One of the other papers (other than the paper by
O'Keefe and myself) in SILICA 96 again verifies this.  I would be happy to
send a free reprint of our illustrated LDg paper to anyone furnishing me
with a snail mail address.  It includes many references.  Blue streaks in
LDg represent enriched deposits of trace element volatiles deposited by the
volcanic gases involved in this very unusual type of pyroclastic eruption.
(I say very unusual because it may involve a massive deposit of cristobalite
and/or tridymite xls at the top end of a differentiated magma column,)  A
very careful trace element analysis of this blue streak may show a slight
enrichment of the guilty party or parties.          D Futrell

>I have a Libyan Desert Glass, of the variety with the very dark
>material, that has a blue streak (not green) in it.  I find that unusual
>for any tektite. Explanation? (It's not part of a rainbow effect.) Have
>others seen similarly offbeat tones in tektites?
>
>----------
>Archives located at:
>http://www.meteoritecentral.com/list_best.html
>
>For help, FAQ's and sub. info. visit:
>http://www.meteoritecentral.com/mailing_list.html
>----------
>
>

----------
Archives located at:
http://www.meteoritecentral.com/list_best.html

For help, FAQ's and sub. info. visit:
http://www.meteoritecentral.com/mailing_list.html
----------
Follow-Ups: