[meteorite-list] Define shock value

From: bernd.pauli_at_paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: Wed Aug 16 10:47:07 2006
Message-ID: <DIIE.0000006900000ADD_at_paulinet.de>

Hello Walter, Hi Jeff, Hello List,

In addition to Jeff's informative website that describes Dieter
St?ffler's petrographic shock classification of chondrites, some
more details that help recognize the shock stage when you look at
a thin section of a chondrite under a microscope in plane and/or
polarized light:

ST?FFLER D. et al. (1991) Proposal for a revised petrographic shock
classification of chondrites (Meteoritics 26-4, 1991, A398-A39):

S1 (unshocked) - sharp optical extinction of olivine
S2 (very weakly shocked) - undulatory extinction of olivine
S3 (weakly shocked) - planar fractures in olivine
S4 (moderately shocked) - mosaicism in olivine
S5 (strongly shocked) - isotropization of plagioclase
   (maskelynite) and planar deformation features in olivine
S6 (very strongly shocked) - recrystallization of olivine
   and phase transformations of olivine (ringwoodite)


Cheers,

Bernd
Received on Wed 16 Aug 2006 10:45:30 AM PDT