[meteorite-list] Thin Sections of Carancas Meteorite Chondritic or not

From: ensoramanda <ensoramanda_at_meteoritecentral.com>
Date: Mon, 08 Oct 2007 11:39:25 +0100
Message-ID: <470A08DD.8070404_at_ntlworld.com>

Hi Elton,

I thought these looked like shock veins...still having trouble knowing
the difference between shock veins and slickenslides in this one?

http://i117.photobucket.com/albums/o43/LaburnumStudio/DSCN6902.jpg

Graham

Mr EMan wrote:

>As to what Rob has raised--I did see several
>chondrules in the photos. This looks much like the
>friable L;s we have seen and contains slickensides
>which would tend to make it a monomyct breccia.
>However these large metal blebs are intriguing and
>might make this an anomalous stone. I didn't see any
>thing in the photos which appeared to be a true shock
>vein, only the slicken sides. However for there to be
>large blebs/clasts of iron and or olivine in the stone
>it must have had a very shocked history with possibly
>injected components of an iron or pallasite. If so,
>this might explain the initial declaration that this
>was a "chondritic pallasite".
>
>Elton
>
>
>--- Rob Matson <mojave_meteorites at cox.net> wrote:
>
>
>>"Based only on the images of the exteriors, I would
>>consider the specimens very unlikely to be
>>
>>
>chondritic. But there~are~ some chondrite-like
>features in the thin sections (though I wouldn't call
>them unambiguously chondrules). The rims are
>indistinct,
>there are no shock veins visible, and the interference
>colors don't seem quite right. I'll forward the images
>to a few experts to get their opinions, but if this
>
>
>>is a chondrite, it would seem to be a metamorphised,
>>highly brecciated one."
>>--Rob
>>
>>
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Received on Mon 08 Oct 2007 06:39:25 AM PDT