[meteorite-list] Native iron in DHO 007

From: mark ford <markf_at_meteoritecentral.com>
Date: Tue Aug 3 12:22:18 2004
Message-ID: <6CE3EEEFE92F4B4085B0E086B2941B3101456F_at_s-southern01.s-southern.com>

Bernd, and list,

Thanks Bernd, we can always rely on you for an explanation.


I still don't quite get how the metal grains can exist, shouldn't all
the metallic iron be bound up?

 I can understand the Fe in the pigeonite (but this would be really
tiny), but there is reasonable amount of ~0.5mm fresh Fe/Ni metal
grains/flecks showing in the matrix, though it doesn't appear to be in
the plagioclase...

Could the over abundance of metal be connected the anomalous oxygen
environment, it is thought to have formed in?

 I suppose it could be brecciation with some well differentiated
Chondritic material mixed in...?


Best,

Mark Ford






-----Original Message-----
From: bernd.pauli_at_paulinet.de [mailto:bernd.pauli@paulinet.de]
Sent: 03 August 2004 16:52
To: Meteorite-list_at_meteoritecentral.com
Subject: [meteorite-list] Native iron in DHO 007

> I was looking at a fellow IMCA member's (Mark Ford) slice
> of DHO 007 last night.... I cannot understand how native Fe
> came to be in the structure.

Hello, hullo, hi Listees and Listoids,

Eucrites predominately contain pigeonite and plagioclase. The pigeonite
usually
contains tiny grains of iron metal which makes these meteorites slightly
magnetic

Reference: NORTON O.R. (1998) Rocks From Space, 2nd edition, pp.
205-206.

Apart from this, Dhofar only contains accessory amounts of metal (plus
troilite and
chromite). Metal is presented as two varieties: kamacite (Ni 4.99 wt%)
and taenite
(Ni 50.5 wt%).

Reference: AFANASIEV S.V. et al. (2000) Dhofar 007 and NWA 011:
Two new eucrites of different types (MAPS 35-5, 2000, Suppl., A019).

Best wishes,

Bernd

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Received on Tue 03 Aug 2004 12:19:26 PM PDT