[meteorite-list] Orbicular granite and chondrites

[Ingo Herkstroeter]

>Hi Kevin!

I´ve never seen a orbicular granite but I´ve seen a orbicular diorite (so
called "Klotgranit") near Slättemossa/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

 --- Ursprüngliche 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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