[meteorite-list] Images of DAG700 vesicles

From: mark ford <markf_at_meteoritecentral.com>
Date: Thu Jul 29 10:14:07 2004
Message-ID: <6CE3EEEFE92F4B4085B0E086B2941B31014563_at_s-southern01.s-southern.com>

And.... would the same be true of Estherville, since this has vesicles
in the matrix, I still don't see how the melt could have surrounded the
Iron inclusions (clearly it flowed around the Eucritic and metal
inclusions), but without destroying the Widmanstatten structure, and
there are vesicles in the matrix too! - surley they are all mutually
exclusive, so what's going on!?

Best
Mark Ford


-----Original Message-----
From: j.divelbiss_at_att.net [mailto:j.divelbiss@att.net]
Sent: 29 July 2004 14:38
To: Adam Hupe
Cc: meteorite-list_at_meteoritecentral.com
Subject: Re: [meteorite-list] Images of DAG700 vesicles

Adam and others,

Cool pics of a very interesting meteorite.

In short, Stan T(before) and Adam have asked "how do vesicles occur in a
deeper forming magmas?" I think the inference is that fast cooling
magmas from sources like volcanos are the typical source for vesicles in
smaller crystalline igneous rock like basalts, and that the deeper melts
or cumulates (with larger crystals) do not form vesicles. Now we have an
anomaly in Dhofar 700 that is a large crystalline(cumulate-like) rock
like perdidotite, norites and gabbros with vesicle like cavities. But
why? (Note: I am a novice like most of us so I would love someone in the
know to comment on this subject to help us understand)...here are some
of my own thoughts.

1. Maybe conditions out on small planetoids are so different with less
gravity, no atmosphere, etc. that this anomaly occurs with gas bubbles
being formed way down deep in the cumulates?

2. Maybe the depth of cumulate forming rock like Dhofar 700 on a small
planetoid is not so deep...allowing the gas pockets to form near the
surface...like earthly volcanic basalts.

3. Was water involved, and are we looking at vugs that are related to
vein materials? Is this material different than the average diogenite
and possibly from a vein...is it much different from a mineral
standpoint?

I hope the investigations are continuing on this very interesting
meteorite.

John

  



-------------- Original message from "Adam Hupe" : --------------

> Dear List,
>
> I finally found a few minutes to spare so I thought it would be nice
to
> share some images of the DAG700 Diogenite that impresses me, greatly.
> Blaine Reed and his wife, Linda stopped by my beach shack on their way
back
> from Canada. After spending some time visiting with them, Blaine
showed me
> this full slice of DAG700. I would not let him leave until it was in
my
> possession so I spent some time haggling with him to acquire this
awesome
> specimen. I thought that Diogenites were supposed to be cumulates so I
can
> not understand where all the vesicles in this specimen came from. Here
are
> a few images:
>
> Blaine and Linda at the beach:
> http://themeteoritesite.com/Blaineandlinda.jpg
>
> Image of vesicles in DAG700:
> http://themeteoritesite.com/DAG700-1.jpg
>
> Second Image of vesicles:
> http://themeteoritesite.com/DAG700-2.jpg
>
> I know of only two DAG700 stones that have vesicles and this one of
Blain's
> blows my mind. I hope you enjoy the images and I will post some very
> interesting announcements soon.
>
> Wishing everybody well,
>
> Adam Hupe
> The Hupe Collection
> Team LunarRock
> IMCA 2185
>
>
>
>
> ______________________________________________
> Meteorite-list mailing list
> Meteorite-list_at_meteoritecentral.com
> http://six.pairlist.net/mailman/listinfo/meteorite-list
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Received on Thu 29 Jul 2004 10:11:20 AM PDT