[meteorite-list] CH or CB Chondrite?

From: bernd.pauli_at_paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 10:29:54 2004
Message-ID: <DIIE.00000042000010CE_at_paulinet.de>

> G'day List,

Hello Down Under,

> HaH 237 is formally classified as being a CH (petrologic type 3) ...

RUSSELL S.S. et al. (2003) Copper isotope systematics in CR, CH-like
and CB meteorites: A preliminary study (MAPS 38-7, 2003, A124).

In this abstract, Mrs. Russell calls it "CH-like". J.A. Whitby,
on the other hand, writes in his abstract in the same issue:

Gujba and HaH 237 are both members of the metal-rich carbonaceous
chondrite CR clan. Differences in petrography, such as the size of
chondrules, led to the designation of Gujba as CBa and HaH as CBb.

WHITBY J.A. et al. (2003) Gujba and HaH 237 (MAPS 38-7, 2003, A105).

> 've seen it listed on many websites as a CH-BEN (Metal rich Bencubbinite).
> I thought that CB or Bencubbinites are now a separate classification including
> the 5 members:

Bencubbin = CB3a
Gujba = CB3a
NWA 1814 = CB3a
QUE 94411 = CBb
Weatherford = CB3a

and A. Greshake writes:

Bencubbin, Weatherford, and Gujba have recently been placed together
in a new metal-rich chondritic grouplet called CB (carbonaceous Bencubbin-
like) chondrites. Due to their strong similarities to CR and CH chondrites,
they are considered as part of the CR carbonaceous chondrite clan.

GRESHAKE A. et al. (2002) Heavily-hydrated lithic clasts in CH chondrites
and the related, metal-rich chondrites Queen Alexandra Range 94411 and
Hammadah al Hamra 237 (MAPS 37-2, 2002, pp. 281-293).

Best wishes,

Bernd

P.S.: In spite of this information, it is (as usual :-) very, very helpful to go
to David Weir's website for further valuable details and descriptions !!!

To: jeff_at_meteoritesaustralia.com
    meteorite-list_at_meteoritecentral.com
Received on Sun 14 Sep 2003 06:10:48 AM PDT