[meteorite-list] debat , , monzogabbro /dolerite/ mare basalt/ lunar.

From: Martin Altmann <altmann_at_meteoritecentral.com>
Date: Tue, 22 Jan 2008 14:45:09 +0100
Message-ID: <009401c85cfd$06dfca30$177f2a59_at_name86d88d87e2>

Hi Aziz,

as shown on the pages of the links, you gave here,
the chemistry is more or less identical with the LaPaz-pairing-group and NWA
032/479.
And the texture is the very same like the texture of the LAP-Moons.
So from my amateurish point of view, I could imagine, that NWA 4734 could
end with the same designation fo the type, as the LAP-group has in the
Bulletins: "Lunar (basalt)".

However. It's exciting material, isn't it?
Best!
Martin

-----Urspr?ngliche Nachricht-----
Von: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] Im Auftrag von habibi
abdelaziz
Gesendet: Dienstag, 22. Januar 2008 13:56
An: meteorite list
Betreff: [meteorite-list] debat , ,monzogabbro /dolerite/ mare basalt/
lunar.

hello list members ,
 
well , i get just yet an email , about nwa 4734 classification obtain
=lunar.
not definitive il ya a parler.
 
1= witch other stone stone is called only lunar,without suite;?
2= first this stone was called monzogabbro than , American scientist call it
mare basalt,
3= than there was a proposition for dolerite
4= the nomcom didn't retain any of this for the fact that there is not
compromise they say it's a lunar and stop the issue is not finish,
5= American scientist are talking about launch-pairing from ejecta, in
other terms a paring from the moon from the crater, with lap
02205-02224-02226-02234-02436-03632
 
6= http://meteorites.wustl.edu/lunar/stones/nwa4734.htm
        http://meteorites.wustl.edu/lunar/chemclass/chemclass_lap02205.htm
        http://www.flickr.com/photos/azizhabibi/sets/72157602531819147/
7=i m happy with my half kilos lunar what ever the name is ,
 
and here is a comment from dr jambon
 
NWA 4734 : Lunar
The appropriate classification for this rock is the subject of discussion
between scientists. Its chemical composition is identical to LAP
02205-02224-02226-02234-02436-03632 which have been classified as Mare
basalt. The name basalt however is not appropriate as it is a coarse grained
rock and the texture is isotropic unlike rapidly cooled rocks from lava
flows (basalts).
In the case of terrestrial rocks the name gabbro is usually completed by its
subtype. The criteria used for classification are the modal composition and
proportion of plagioclase/alkali feldspar and the amount of quartz. NWA 4734
does not contain quartz but abundant silica instead (critobalite partly
transformed by shock). This is due to the low pressure (low gravity) at the
surface of the Moon. A similar terrestrial rock should be called quartz
monzogabbro. For these reasons the Nom Com did not retain Mare basalt, but
more simply Lunar, until the classification issue is settled.
The nomenclature for Lunar rocks has been defined in the early seventies
when studying the Apollo specimens. The nomenclature for terrestrial
magmatic rocks has been published in 1976. Whether this classification can
be used for Lunar rocks is the subject of debate; still similar names (e.g.
basalts, gabbros etc) are used for both types of rocks.
We must notice that among Lunar rocks most are breccias (e.g. Mare basalt
Breccias); other basalts have typical quench textures (e.g. NWA 032/479).
NWA 4734 is unique among Lunar meteorites (outside Antarctica) having a
coarse grained magmatic texture (not brecciated). LAP samples share with NWA
4734 a similar texture and a similar chemistry (Jambon et al. 2008) and
poses the question of possible pairing for rocks found about 25 000 km
apart.
Albert JAMBON
Laboratoire Magie
Universit? Pierre et Marie Curie
4 place jussieu 75252 Paris Cedex O5 Franc
 
Streckeisen A. (1976) To each plutonic Rock its proper name. Earth Sci. Rev.
12, 1-33
 
____________________________________________________________________________
_______
 
my best
aziz habibi

habibi aziz
box 70 erfoud 52200 morroco
phone. 21235576145
fax.21235576170</font>


 
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Received on Tue 22 Jan 2008 08:45:09 AM PST