[meteorite-list] Orbicular granite and chondrites

From: Ingo Herkstroeter <metopaster_at_meteoritecentral.com>
Date: Sat Sep 10 08:51:04 2005
Message-ID: <19126.1126356662_at_www41.gmx.net>

>Hi Kevin!

I?ve never seen a orbicular granite but I?ve seen a orbicular diorite (so
called "Klotgranit") near Sl?ttemossa/Sweden. Diorites have more plagioclase
and only a few of the quartz amount of a granite. If you mean granite type
called "Rapakiwi" (rounded K-feldspar with plagioclase rims) I?ve seen such
stuff also in Sweden.
I think there is not much known about the genesis of this textures (only a
lot of discussions). But I?m very sure that their origin is not related to
chondrites, cause they are differentiated rocks and chondrites are not.
So granites and diorites a generated in a differentiated crust of a big body
(planet or planetoid), chondrites are not formed in a crust like
invironment.
If there?re some questions left, feel free to ask.

Best Wishes

Ingo/Germany

 --- Urspr?ngliche Nachricht ---
> Von: "Kevin Forbes" <vk3ukf_at_hotmail.com>
> An: meteorite-list_at_meteoritecentral.com
> Betreff: [meteorite-list] Orbicular granite and chondrites
> Datum: Sat, 10 Sep 2005 19:14:13 +1000
>
> Hi list,
> has anyone ever seen orbicular granite?
> Is the formation of this material related to the formation of chondritic
> meteorites in any way?
> Cheers, Kevin, VK3UKF.
>
>
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Received on Sat 10 Sep 2005 08:51:02 AM PDT