[meteorite-list] NWA 3118 CV3 Chondrule-Field Update

From: Walter Branch <branchw_at_meteoritecentral.com>
Date: Tue Feb 22 17:57:53 2005
Message-ID: <00dd01c51931$f1a4abc0$6a01a8c0_at_DrCollman>

Hi Adam,

What does all this mean?

-Walter
-----------------------------------------------------
----- Original Message -----
From: "Adam Hupe" <raremeteorites_at_comcast.net>
To: <meteorite-list_at_meteoritecentral.com>
Sent: Tuesday, February 22, 2005 3:43 PM
Subject: [meteorite-list] NWA 3118 CV3 Chondrule-Field Update


> Dear List Members,
>
> There was some question about the strange clasts in the NWA 3118 CV3s.
They
> looked like CO3 chondrule-fields to me so I had them studied. Oxygen
> isotope studies were performed at Carnegie and Petrologic/Microprobe work
> was performed at UW. Here are the most interesting results:
>
> Northwest Africa 3118, additional data
> Morocco
> Purchased 2003 December
> CV3 chondrite
> A small stone representing part of the main mass held by A. and G. Hup?
> (Hup?) was found to contain a dark inclusion measuring approximately 9 cm
by
> 2.5 cm by 1 cm. Microprobe examination of the inclusion by A. Irving and
S.
> Kuehner (UWS) shows it to consist of small chondrules and chondrule
> fragments composed of very magnesian olivine (Fa1.1) with marginal Fe-rich
> reaction zones (Fa36.9) against a porous matrix composed of felted blades
of
> relatively ferroan olivine (Fa40.9-45.9) with accessory troilite and
> pentlandite. This clast has the attributes of Type A/B dark inclusions
> described by Brearley and Jones (1998, p. 3-227), and the textures suggest
> that it may have formed by partial sublimation of original chondrules and
> re-condensation. Oxygen isotope analysis by D. Rumble (CIW) of
acid-washed
> whole inclusion material by laser fluorination gave replicate values of
?17O
> = +0.08, -0.18; ?18O = 5.14, 4.99; ?17O = -2.63, -2.81 per mil,
> respectively, which plot on the best fit line for whole rock CV
chondrites.
>
> Here is a specimen that clearly demonstrates what the above report
> describes:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=6513101418
>
> I hope you found the above data as interesting as I did.
>
> Kind Regards,
>
> ------------------------------------
> Adam Hupe
> The Hupe Collection
> Team LunarRock
> IMCA 2185
> raremeteorites_at_comcast.net
>
>
>
>
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Received on Tue 22 Feb 2005 05:57:54 PM PST