[meteorite-list] Chondritic parent bodies

From: Jeff Grossman <jgrossman_at_meteoritecentral.com>
Date: Wed, 09 Sep 2009 15:26:04 -0400
Message-ID: <4AA8014C.9030009_at_usgs.gov>

Those 1998 remarks still hold true, except for one thing... we've mostly
weeded out the classifications that used a slash for breccias. There
are still some in the MetBull database, probably, but mostly they're
fixed. Breccias are still a complete mess and nothing has changed.

Jeff

bernd.pauli at paulinet.de wrote:
> Hello All,
>
> I'm really glad that Jeff G. responded because I didn't know whether or not I should
> mention his thoughts of about 10 years ago (!) when I asked him about hyphens and
> dashes and the confusion they cause! I was inquiring about DaG 140, then classified
> as an H3.9-6.
>
> Mon, 07 Sep 1998, Jeff wrote (excerpt):
>
> 1) The hyphen implies a continuous range, and also implies that there
> is no dominant lithology in the breccia. Yet, DaG 140 could be:
>
> a) a type 3 chondrite with a single equilibrated clast found;
> b) a type 6 chondrite with a single type 3 clast found;
> c) a mixture of types 3, 4, 5, and 6 material;
> d) a light-dark breccia with mostly comminuted matrix and only a few clasts, including type 3 and 6 ones.
>
> So, right now we have a literature polluted with this and other nomenclatures
> (like using a "/" instead of a "-" for the same thing), ...
>
> Slashes (e.g., L5/6) indicate transitional classes, hyphens (e.g., H5-6) indicate breccias, ...
>
> Best wishes,
>
> Bernd
>
>
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-- 
Dr. Jeffrey N. Grossman       phone: (703) 648-6184
US Geological Survey          fax:   (703) 648-6383
954 National Center
Reston, VA 20192, USA

Received on Wed 09 Sep 2009 03:26:04 PM PDT