[meteorite-list] Divnoe

From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:41:06 2004
Message-ID: <3A7C2DCA.A3F48C4D_at_lehrer1.rz.uni-karlsruhe.de>

Matteo inquired:

> Divnoe ... a Brachinite or not? Serguei Vassiliev ... is
> brachinite. Klaus Becker ... anomalous primitive achondrite.

Rhett responded:

> it is anomalous but fits closely enough to
> brachinites that it is often considered one.

Piper added:

> There are three main diagnostic characteristics that lead us to the
> conclusion that Divnoe is related to the brachinites: (i) similarity
> of the chemical abundances of the major lithophile, siderophile,
> refractory, and volatile elements, (ii) Divnoe and the brachinites
> fall on the same oxygen fractionation line, and (iii) Divnoe and
> Brachina contain the same (ordinary chondritic) trapped Xe
> isotopic pattern.

Hello All!

MAPS 33-1, 1998, pp. 003-004: From the Editors

Brachinites: A developing story (excerpt)

Divnoe is an olivine-rich primitive achondrite and has some
characteristics that are similar to those of the brachinites. It has
also been classified as an HED meteorite, but this association is
weak. Its O isotopes are on an extension of the brachinite mass
fractionation trend, which might indicate a relationship. If not
a brachinite, then it is yet another single member of a new group.

BOGDANOVSKI O. et al. (1997) Manganese-53/Chromium-53 isotope
system in the Divnoe meteorite (Meteoritics 32-4, 1997, A016):

The mineral composition of Divnoe is similar to that of ordinary
chondrites, but it has an achondritic texture and belongs to the
specific meteorite group of primitive achondrites. According to Petaev
et al. (1994), the meteorite consists of a granoblastic, coarse-grained,
olivine groundmass with relatively large pyroxene-plagioclase poikilitic
patches and small fine-grained domains of an opaque-rich lithology. The
composition of Divnoe could be derived from a chondritic source by
partial melting, followed by crystallization of the partial melt, and
removal of the still-liquid portion of the partial melt. The
coarse-grained lithology represents the residue of partial melting, and
the poikilitic patches are a portion of partial melt that crystallized
in situ (Petaev et al. 1994).


Best wishes,

Bernd
Received on Sat 03 Feb 2001 11:11:54 AM PST