[meteorite-list] Composition of Tektites

From: Sterling K. Webb <sterling_k_webb_at_meteoritecentral.com>
Date: Sun, 29 Aug 2010 01:50:29 -0500
Message-ID: <8168FD7F41684CA5ABC2A4ADD13CD96F_at_ATARIENGINE2>

Water content of glasses, parts per million:
-----------------------------------------------------------
Obsidian 30,000ppm
Rio Curao Glass 12,900ppm
Darwin Glass 4,600ppm
Bediasites, Georgiaites 2,000ppm
Moldavite 1,000ppm

Atomic Bomb Glass 700ppm
Ivory Coast Tektite 300ppm
Moon (surface) 200ppm
-----------------------------------------------------------
Volcanic glass wet. Inpact glasses less wet.
Oldest tektites have had time for water to
difuse into them (30,000,000 years). New
tektites dry as bomb glass or the Moon.


Sterling
-------------------------------------------------------------
----- Original Message -----
From: <cdtucson at cox.net>
To: "Sterling K. Webb" <sterling_k_webb at sbcglobal.net>
Sent: Saturday, August 28, 2010 11:51 PM
Subject: Re: [meteorite-list] Composition of Tektites


> Sterling,
> I cannot get the down load to complete for some reason. Also there was
> a recent finding of water found in lunar glass. So, if it would be
> considered to be a lunar tektite then there is H2o in some tektites .
> or whatever the lunar glass ended up being.
> By the way. I loved all of that info you forwarded.
> Seems to me it is still a matter of opinion? or who you believe?
> Thanks Carl
> --
> Carl or Debbie Esparza
> Meteoritemax
>
>
> ---- "Sterling K. Webb" <sterling_k_webb at sbcglobal.net> wrote:
>> Hi, Walter, List
>>
>> The chief proponent of tektites as ejecta from
>> lunar volcanoes was John O'Keefe (d. 2000).
>> Of course Nininger thought of the idea, too,
>> but neither of them was the first.
>>
>> The chief expert on lunar glass and tektite analysis
>> is B. P. Glass, yes, his name is BILLY GLASS. This
>> makes trying to Google up articles about lunar glasses
>> by Glass very difficult, but he has a trunkful of papers
>> on lunar glasses:
>> http://www.geology.udel.edu/glass/bghistory.html
>>
>> I think this is the one you may be talking about:
>> "Glass, B. P. (1986) Lunar sample 14425: Not a lunar
>> tektite, Geochimica et Cosmochimica Acta 50, 111-113."
>>
>> In 1985, O'Keefe and Glass published a paper saying
>> the biggest glass bead from the Moon (eight mm!) was
>> a high-magnesium tektite. One year later, in 1986, they
>> took it all back. Experimental error. Here's the abstract:
>> http://www.sciencemag.org/cgi/pdf_extract/229/4720/1410
>>
>> Still, lunar volcanism, IF it exists, still leaves us with
>> the problem that we don't know what lunar magma
>> would be like, if it exists. How would you know anything
>> was a product of lunar volcanism if you didn't know
>> what lunar volcanic product was?
>>
>> There is no such thing as a single "tektite" composition.
>> There are Hi-Si, Lo-Si, Hi-Mg, Hi-Na, Lo-Na... and on
>> and on. The one sure thing is H2O -- they ain't got any.
>>
>> I tried posting this to the List earlier but it doesn't
>> seem to have gone through. For a lot of information on
>> tektites, O'Keefe's 1976 is still quite a good read.
>>
>> The first five chapters of John O'Keefe's 1976 book,
>> "Tektites and Their Origin," long out-of-print (Amazon
>> $200) had been posted for many years on a website
>> ("originoftektikes.com") but is now a dead link.
>>
>> Those first five chapters of O'Keefe's "Tektites and Their
>> Origin" is now available for download as a book in PDF
>> format at:
>>
>> http://www.sendspace.com/file/2y55kt
>>
>> That link will only be good for a limited time before it
>> expires, so don't save it as a reference -- use it. Just
>> click on the orange download button near the bottom
>> of the page.
>>
>> Regards,
>>
>>
>> Sterling K. Webb
>> --------------------------------------------------------------------------
>> ----- Original Message -----
>> From: "Walter Branch" <waltbranch at bellsouth.net>
>> To: <meteorite-list at meteoritecentral.com>
>> Sent: Saturday, August 28, 2010 10:14 PM
>> Subject: [meteorite-list] Composition of Tektites
>>
>>
>> > Hello Everyone,
>> >
>> > I thought I had a paper somewhere in my files but I can't locate
>> > it.
>> >
>> > There is an old theory, largely discredited I believe, which
>> > states
>> > that tektites originate from lunar volcanoes. The glassy beads
>> > found
>> > in the lunar regolith and brought back by the Apollo astronauts are
>> > of
>> > volcanic origin.
>> >
>> > Can some inform me as to the results of a comparative analysis
>> > between
>> > tektites and the those glassy beads?
>> >
>> > I know I have reprints somewhere but I can't find them.
>> >
>> > Thanks.
>> >
>> > -Walter Branch
>> >
>> >
Received on Sun 29 Aug 2010 02:50:29 AM PDT