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
[email protected] 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
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