[meteorite-list] FW - NEW LUNAR monzogabbro meteorite (Aziz Habibi)

From: gipometeorites <carsten.giessler_at_meteoritecentral.com>
Date: Tue, 27 Feb 2007 09:26:24 +0100
Message-ID: <CD16B1759D7F41F9A5862F07B59E837B_at_gipometeoritPC>

Hi List,

Aziz Habibi asked me to forward a email from him to the list,
so here it is:

dear list,

here is the first lunar monzogabbro!!, as you will read in the classification; it's also the first lunar to look like a shergotite.

under microscope it's looking exactly like a shergotite from the texture..

with all modesty this is one of the most important planetary meteorite.a very rare classification .

enjoy photo in this link and here is the classification done by doctor Albert Jambon from upvi Paris.

..... yes a lunar with a"" Martian""shergtoite texture.????....

 

go to this link and click on lunar album nwa 4683.

http://photos.yahoo.com/azizhabibi....

 

to understand how it's classified as monzogabbro check out this link.

http://www.uwgb.edu/DutchS/PETROLGY/classification_of_igneous_rocks.htm.

enjoy photo in this link and here is the classification done by doctor Albert Jambon from upvi Paris.

 

there are other album including a new oriented Martian and a very fresh lodranites.

all the best,

aziz habibi

 

Proposed Name NWA 4683 Geographic Coordinates1 undisclosed.

Erfoud Morocco

Find : october of 2006

Major classification (group) Achondrite (Lunar monzogabbro)

 

History: two pieces bought from nomads in Erfoud (Morocco).

Physical characteristics: One stone broken in two pieces 68 and 409g. Dull black fusion crust on one side, weathered on the other side. It is a gray, coarse grained, pristine magmatic rock consisting of millimetric phenocrysts mainly of pyroxene and plagioclase.

 

Petrography: A. Jambon, O. Boudouma and D. Badia. UPVI .

The texture is best described as shergottitic like . Pyroxene are highly fractured while plagioclase laths, partly transformed to maskelynite, are only affected by a small number of fractures. Silica and silica-feldspar glass are minor components. A few impact melt patches underline the similarity with shergottites further. Ilmenite, baddeleyite, zirconolite, tranquilityite, pyrrhotite and metal. Fayalite associated with silica probably results from the dissociation of iron rich pyroxene. Minor terrestrial alteration.

Mode (vol %): Cpx 50, Plagioclase + Kspar 32, silica + glass 7.5, opaques (ilmenite, Ti-magnetite, pyrrhotite) + fayalite 7, voids + fractures 3.

 

Geochemistry: Mineralogy by EMP and SEM.(Trace and major element analyses ICP-MS, J-A Barrat UBO).

Pyroxene exhibit a complex zoning from En65Fs21Wo13 to En2Fs83Wo15 with a FeO/MnO of 78 on the average. A few compositions correspond to pyroxferroite. Plagioclase is normally zoned from An 91 to An 75 with a sharp rim. Average composition An 89. Fayalite (Fo 80 to 95).

Chondrite normalized REE pattern with an enrichment of 53 (La) to 40 (Yb). Trace element pattern with negative anomalies of Sr and Eu.

Interstitial glass high in silica (75%) containing microcrysts of K feldspar with a significant celsian component.

The chemistry, major and trace elements, but not the texture, is identical to NWA 032-479-773 and LAP 02205-02224-02226-02234-02436-03632.The absence of olivine and the relative abundance of silica in NWA 4683 are the main differences beside the grain size and the slightly different composition of the major phases.

 

 

Classification: According to the grain size, the texture, the plagioclase composition, the core composition of pyroxenes, the FeO/MnO ratio in pyroxene and the chemical identity with lunar basalts, it is classified as a highly shocked lunar monzogabbro.

 

 

Type specimens: A total of 20 g of sample and one polished section is on deposit at UPVI.. Aziz H. holds the main mass .

 

 

 

MR HABIBI

palm's hotel club .

www.palmotel.com.

email.. direction at palmotel.com.

phone = 21235576144/45/37

fax = 21295576170
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Received on Tue 27 Feb 2007 03:26:24 AM PST