[meteorite-list] Steves unproven tektite theory by Steve lol!

From: Aubrey Whymark <tinbider_at_meteoritecentral.com>
Date: Mon, 27 Feb 2012 04:35:39 +0000 (GMT)
Message-ID: <1330317339.49531.YahooMailNeo_at_web132504.mail.ird.yahoo.com>

Hi John and list
?
I only check this list every week or so! I'm real busy with work and also writing my tektite book. It is very well progressed now - so hopefully soon, but the longer it takes the better it gets (I hope)! I said 2011, now 2012 (end of)! I have some very interesting new interpretations coming forward regarding the role of plastic deformation in almost ALL tektites. Check out my abstract for the LPI conference. http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1045.pdf
?
Regards, Aubrey
?
?
?
?
----- Original Message -----
From: John.L.Cabassi <John at Cabassi.net>
To: 'Aubrey Whymark' <tinbider at yahoo.co.uk>
Cc:
Sent: Monday, 27 February 2012, 5:25
Subject: RE: [meteorite-list] Steves unproven tektite theory by Steve lol!

G'Day Aubrey
Thank you. I've been watching this thread develop. I wanted to jump in
but I wanted to see what further information people were willing to
offer up. And I said to Kat, it's amazing that Aubrey hasn't jumped in
and I just got home and logged in and sure enough, you're up close and
personal.


Cheers,
John

John Cabassi - Johnno
IMCA #2125
www.MeteoriteJunction.com
MeteoriteHQ.Com? (still under construction)
Twitter: _at_meteoritejohnno
http://facebook.com/MeteoriteJohnno





-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Aubrey
Whymark
Sent: Sunday, February 26, 2012 6:21 PM
To: Meteorite list
Subject: Re: [meteorite-list] Steves unproven tektite theory by Steve
lol!


Hi
?
The etching is genuine. The statement that 'if etching was terrestrial
then the whole surface would be etched' is incorrect.You have to
remember that different surfaces have been exposed to different
conditions. Some surfaces simply have no stresses and lines of weakness
for chemical attack to occur and if it does occur then it is more even
on these surfaces. The posterior smooth surface, which was not exposed
to re-entry heating, generally survives very well. The spalled areas or
bald areas again have no lines of weakness and often avoid etching. The
anterior surface which suffered re-entry heating and then rapid cooling
has many lines of weakness and is readily attacked. If you take the
stretch tektites then the exterior surface was cooled, re-heated and
then rapidily cooled. The interior stretch part was exposed late on -
either due to impact breakage or more likely thermal breakage when the
tektite had lost its inherited cosmic velocity and shock? wave and then
rapidly cooled. This exposed stretch surface simply cooled. The two
surfaces are very different in terms of thermal history and weaknesses,
hence one is heavily etched and the other lightly or not etched.
?
If you don't believe that pitting can form by natural etching then study
ancient soda glass. Islamic glass jeton is great as it can be accurately
dated. This material, sometimes over 1000 years old will sometimes show
pitting. Soda glass is a lot lower in quality compared with tektite
glass and so the process of etching is quicker.
?
Etching is genuine, but is not random - this is the key point. It
attacks cracks and weaknesses caused as the tektite cooled then
re-entered the atmosphere.
?
If you want to study etching then start with moldavites and then work
towards the more recent Australasian tektites. Etching is a tricky
subject btw. Etching is, strictly speaking, alkaline attack that targets
the silica network. This usually creates v-grooves. Leaching is the acid
attack which is more common as tektites usually occur reworked in porous
and permeable gravels exposed to meteoric waters. Acid attack targets
the alkaline component in the glass. The acid attack usually results in
rounded pitting and u-grooves. The two processes can also act in
parallel if conditions are right. The geological and reworking history
of an individual specimen is often complex and, combined with abrasion
from transportation, can result in a diversity of sculpture and
morphologies. I know that etching is genuine, but I still wondered if
some of the anterior sculpture on indochinites was original. I don't
think it is. Another way to study etching is to collect half a ton of
different tektites with various stages of sculpture. Your wife will be
happy with that suggestion.
?
Also, tektites are glass, quenched very quickly - no crystals or
crystallites here!
?
Regards, Aubrey Whymark

From: Daniel <rainteach at aol.com>
To: meteorite-list at meteoritecentral.com
Sent: Saturday, 25 February 2012, 19:26
Subject: Re: [meteorite-list] Steves unproven tektite theory by Steve
lol!

Hi Carl,

I don't agree with everything about this theory, I just thought it was
interesting. There all still a lot of unknowns when it comes to
tektites.

Are you a tektite collector?

Best Regards,
Daniel Sutherland



On Feb 25, 2012, at 9:45 AM, <cdtucson at cox.net> wrote:

> Daniel, Steve,
> All due respect to this theory.
> I'd like to hear more? about this theory because he says;
> "Theories about chemical etching and spalling as the major creators of
surface sculpturing have been proven unlikely."
> He does not explain this statement. How has this been proven unlikely?

> If his theory is true. How do you explain all of the glass rocks found
that have the same surface features as tektites but, have been ruled out
as tektites based largely on the amount of H2O within them?
> Arizonaites( Saffordites) ?, Columbianites?, etc.
>
> Carl
> meteoritemax
>
> --
> Cheers
>
> ---- Daniel <rainteach at aol.com> wrote:
>> Hi all,
>>
>> Take a look at this website.
>>
>> http://www.edamgaard.dk/Copy%20of%20VietnamTektites%20edj.htm
>>
>>
>> Cheers,
>> Daniel Sutherland
>>
>> Sent from my iPhone
>>
>> On Feb 24, 2012, at 11:19 PM, "Dan Wray" <daniel_wray at comcast.net>
>> wrote:
>>
>>> Steve,
>>>
>>> I am a tektite collector and I agree with you about the so called
>>> etching. If you look at broken fragments of hollow tektites the
>>> inside surface is smooth and the outside textured.? You can also see

>>> this on stretched specimens, the stretched area is smooth.? This so
>>> called etching is bogus.
>>>
>>> Dan Wray
>>> ----- Original Message ----- From: "Steve Dunklee"
>>> <steve.dunklee at yahoo.com>
>>> To: <Meteorite-list at meteoritecentral.com>
>>> Sent: Friday, February 24, 2012 1:41 PM
>>> Subject: [meteorite-list] Steves unproven tektite theory by Steve
lol!
>>>
>>>
>>>>
>>>> I believe the features on most tektites are produced during
>>>> formation and not by etching. As the molten material reaches the
>>>> upper atmosphere they reach a verry cold environment with low
>>>> atmospheric pressure. The skin of the material is outgassing? while

>>>> being exposed to sub zero temps. this outgassing while freezing
>>>> causes the skin to crystalize in strange shapes. then they are
>>>> smoothed off during re entry which reaches speeds over the speed of

>>>> sound. when wet limestone mud freezes in winter it causes similar
>>>> crystal formations. when you mash them down they look like the
>>>> surface of tektites. the molten material travels up to 4 or 5 miles

>>>> in a molten state where it is quenched by sub zero tempratures
>>>> causing crystalization. then re heated during its fall back to
>>>> earth. the deep sharp grooves made during cooling are rounded off
>>>> during re melting. I have a teardrop with smooth glassy surface on
>>>> one end with no etching. if the etching was terestrial
the
>>>> whole tektite would be etched.
>>>> Cheers
>>>> Steve Dunklee ______________________________________________
>>>>
>>>> Visit the Archives at
>>>> http://www.meteoritecentral.com/mailing-list-archives.html
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>>>
>>>
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Received on Sun 26 Feb 2012 11:35:39 PM PST