I'm must be missing something. What could one conclude by comparing thin
sections of NWA 725 and a known winonaite? I understand that distinguishing
among acapulcoites, lodranites and winonaites is not a textural exercise nor
can they be resolved by just their mineral composition.
Hello
Hmm ?!?
Just noticed something contradictory:
The winonaites are texturally similar to acapulcoites, but the winonaites
contain coarser grains and abundant crosscutting metal-sulfide veins.
Marvin's pic of the Acapulco thin section shows grains that are coarser
than the ones of NWA 1054 but
--- [EMAIL PROTECTED] ha scritto:
Unortunately I still don't have a thin section of an
acapulcoite but the one pictured
in Marvin Killgore's Color Atlas of Meteorites in
Thin Section on pages 208-211
(Acapulco) surely looks different than the winonaite
on pages 232-235 (NWA 1054).
but
hello
this is the official study and analysis
http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1808.pdf
Matteo
--- [EMAIL PROTECTED] ha scritto:
Hmm ?!?
Just noticed something contradictory:
The winonaites are texturally similar to
acapulcoites, but the winonaites
contain coarser
http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1808.pdf
Matteo, thank you for the link. An interesting detail with regard to NWA 725's
status as a winonaite or an acapulcoite might be this conclusion by the authors
at the end of the paper:
... the Cr2O3 contents of high-Ca pyroxenes, (1.56 -
Hmm-ing again :-)
The winonaites are texturally similar to acapulcoites, but the winonaites
contain coarser grains and abundant crosscutting metal-sulfide veins.
Could this by a typo because:
Marvin's pic of the Acapulco thin section shows grains that are coarser
than the ones of NWA 1054 ...
- Original Message -
From: [EMAIL PROTECTED]
To: Meteorite-list@meteoritecentral.com
Sent: Thursday, February 16, 2006 11:02 AM
Subject: [meteorite-list] Acapulcoites and NWA 725
I'm must be missing something. What could one conclude by comparing thin
sections of NWA 725 and a known winonaite? I
John Kashuba
Ontario, California
- Original Message -
From: [EMAIL PROTECTED]
To: Meteorite-list@meteoritecentral.com
Sent: Thursday, February 16, 2006 11:02 AM
Subject: [meteorite-list] Acapulcoites and NWA 725
I'm must be missing something. What could one
conclude
John Kashuba
Ontario, California
- Original Message -
From: [EMAIL PROTECTED]
To: Meteorite-list@meteoritecentral.com
Sent: Thursday, February 16, 2006 11:02 AM
Subject: [meteorite-list] Acapulcoites and NWA 725
I'm must be missing something. What could one
conclude
FLOSS C. et al. (2002) Acapulcoite complexities: Clues from
trace element distributions (MAPS 37-7, 2002, A047, excerpts):
1. Acapulcoites and lodranites are primitive achondrites from a common parent
body that experienced variable degrees of partial melting and melt migration.
2. NWA 725
Stan and David kindly wrote:
As for NWA 725, here are the details as Stan shared them with me:
Recent O-isotopic analysis of a probable paired stone...by the Open
University resolves the material clearly within the winonaite field.
Hello List,
Does anyone have a NWA 725 thin section and a
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