[meteorite-list] Dhofar 008 - highly unequilibrated chondrite

From: bernd.pauli_at_paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 10:32:47 2004
Message-ID: <DIIE.0000004100001B51_at_paulinet.de>

Stan wrote:

> Does anyone have any more information about Dho 008?
> The Cometshop guys have been selling it as an L3.2,
> however I have seen reference to it as an H/L. Any further
> insight would be appreciated ...

Dhofar 008 has a weathering grade of W2 and a shock stage
of 3. So far so good. But now the problems really start :

a) the average chondrule diameter puts it in the low range
of average chondrule sizes for the L group;

b) Fa content of olivine varies in a wide range from 1.3-50.4
proof of its being (highly unequilibrated);

c) The average Fa and Fs values are in the range for H chondrites (!);

d) The range of Co contents in kamacite includes the ranges for H
and L chondrites;

e) Bulk chemical composition show that it has the typical
characteristics of L group chondrites;

f) Oxygen isotopic compositions are almost in the range
of LL chondrites;

g) Oxygen isotopic compositions resemble those for Tieschitz (H/L);

The authors conclude that the meteorite:

(a) corresponds to petrological type 3.2/3.3;
(b) may contain material from several different reservoirs.


Best regards,

Bernd


Reference:

IVANOVA M.A. et al. (2001) Geochemical and thermoluminescence
studies of Dhofar 008, a L3.2/3.3 chondrite (MAPS 36-9, 2001, A088).
Received on Tue 09 Mar 2004 02:41:53 AM PST