[meteorite-list] petrological type

From: Michael Mulgrew <mikestang_at_meteoritecentral.com>
Date: Fri, 11 Apr 2014 10:21:18 -0700
Message-ID: <CAMseTy2jROzNVT431N3SY2kGGNB-zS9Bb1ccEebRRGbjf4dG7A_at_mail.gmail.com>

Two sequences, one for aqueous alteration and one for thermal
metamorphism (http://www.meteoritemarket.com/PetTypeGroup.jpg). Makes
one wonder how we would classify a meteorite that is both thermally
and aqueously altered...


Michael in so. Cal.
IMCA 3963

On Fri, Apr 11, 2014 at 10:14 AM, Francesco Moser <cojack at tiscali.it> wrote:
>
> Hello, I have a question about chondrites' petrological type number assigned
> after the letters (like H, L, CM or CR ...).
> I have just read something in internet but I think I have misunderstood
> something.
>
> Are the numbers from 1 to 7 in sequence or there are two different
> sequences: 1 to 2 - 3 to 7 ??
> 1 to 2 is for the aqueous alteration degree in carbonaceous chodrites (1
> high degree, 2 low degree)
> 3 to 7 is for thermal metamorphism degree?
>
>
> Thanks a lot
>
> Ciao
>
> <x>x<x>x<x>
> Francesco
>
>
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Received on Fri 11 Apr 2014 01:21:18 PM PDT