[meteorite-list] New Mars Meteorites (DAG 1037, NWA 2046, SAU 130)

star-bits_at_meteoritecentral.com

--
Eric Olson
ELKK Meteorites
http://www.star-bits.com
> 
> Below is the Meteoritical Bulletin announcing the discovery of
> two new Mars meteorites: DAG 1037 and NWA 2046. NWA 2046 was
> announced previously by Anthony Irving last January. Also, not 
> mentioned in the Bulletin is yet another Mars meteorite which 
> was recovered by Mike Farmer in January 2004: 
> SAU 130.  SAU 130 weighs 116 grams and was found in Oman. 
> SAU 130 is assumed paired with the other SAU Mars meteorites, which 
> now includes eight numbered meteorites. So, taking into account 
> pairings and prior annoucements, DAG 1037 is the only 'new' 
> Mars meteorite in this group, and bumps up the Mars meteorite 
> count to 31.
> 
> http://www.jpl.nasa.gov/snc
> 
> Ron Baalke
> 
> --------------------------------------------------------------
> 
> 
>                     THE METEORITICAL BULLETIN
>                 Announcement 88-4, March 31, 2004
>               
>             Sara Russell, Editor (sara.russell_at_nhm.ac.uk)
>             Mike Zolensky, Assoc. Ed. for Northwest Africa 
>                      (michael.e.zolensky_at_nasa.gov)
>           Luigi Folco, Assoc. Ed. for Africa (folco_at_unisi.it)
>          Monica Grady, Assoc. Ed. for Oman (M.Grady_at_nhm.ac.uk)
>        Rhian Jones, Assoc. Ed. for the Americas (rjones_at_unm.edu)
>                Kevin Righter, Assoc. Ed. for Antarctica 
>                      (kevin.righter-1_at_nasa.gov)
>       Jeffrey N. Grossman, Assoc. Ed. for Web (jgrossman_at_usgs.gov)
> 
> This is the fourth electronic announcement of new meteorites to be 
> published in Meteoritical Bulletin, No. 88, 2004 July. 
> 
> Martian meteorites:
> 
> Dar al Gani 1037         Basaltic shergottite (4.0 kg, Libya) 
>                          [see below]
> Northwest Africa 2046    Basaltic shergottite (63 g, Morocco) 
>                          [see below]
> 
> [snip]
> 
> ================================================================
>                 ANNOUNCEMENTS
> ================================================================
> Dar al Gani 1037                           27d20.00' N, 16d13.00' E
>    Libya
>    Found 1999
>    Martian meteorite (basaltic shergottite) 
> Ten stones totaling 4012.43 g were found early 1999 in the sand 
> desert of Dar al Gani. The biggest individual was a complete 
> individual of 3090 g with perfect orientation and rather fresh 
> appearance. Classification and mineralogy (A. Greshake and M. Kurz): 
> an olivine-phyric shergottite with porphyritic texture; large 
> chemically zoned olivine megacrysts are set into a fine-grained 
> groundmass composed of pyroxene and maskelynite; minor phases include 
> chromite, Ti-rich chromite, sulfides, phosphates, and small Fe-rich 
> olivines; olivine megacrysts often contain melt inclusions and small 
> chromites; pyroxenes are dominantly chemically zoned pigeonites, some 
> contain orthopyroxene cores; olivine phenocrysts, Fa31.4-41.1, Fe/Mn 
> 
> Northwest Africa 2046
>    Algeria
>    Purchased 2003 September
>    Martian meteorite (basaltic shergottite)
> A 63g complete and partially crusted stone found near Lakhbi, Algeria 
> was purchased from a Moroccan dealer in 2003 September by M. Farmer 
> (Farmer).  The ellipsoidal stone has an average width of 30 mm, with 
> a 1 to 3 mm thick weathering rind; the interior is very fresh and 
> unweathered.  Classification and mineralogy (J. Wittke and T. Bunch, 
> NAU; A. Irving and S. Kuehner, UWS): olivine-orthopyroxene-phyric 
> basaltic rock.  Subhedral to euhedral, dark brown olivine phenocrysts 
> (up to 2.2 mm long) are strongly zoned from cores of Fa15.7 to rims 
> of Fa47.9, and subhedral to euhedral, prismatic orthopyroxene 
> phenocrysts (up to 2.1 mm long) have cores as magnesian as 
> Fs17.7Wo2.5, surrounded by irregularly zoned mantles with both 
> pigeonite and augite, and pigeonite rims as ferroan as Fs39.0Wo12.5.  
> The groundmass consists mainly of zoned pigeonite (Fs30Wo6.5 to 
> Fs40Wo13) intergrown with maskelynite (zoned from cores of 
> Ab25.5Or0.1 to rims of Ab36.5Or1.1) and small grains of relatively 
> ferroan olivine (Fa47.6-58.1).  Accessory minerals include Ti-
> chromite (Al/(Al+Cr) = 13.8-28.3), chromite, ilmenite,
> Cr-ulvöspinel, pyrrhotite (commonly in parallel growth with 
> ilmenite), merrillite, rare chlorapatite, and rare fayalite (which 
> occurs as a reaction rim on groundmass pigeonite in contact with 
> ilmenite or pyrrhotite).  Trapped melt inclusions in olivine contain 
> aluminous diopside, amphibole(?), pleonaste, chromite, merrillite and 
> glass.  Large, prismatic orthopyroxene phenocrysts exhibit preferred 
> orientation; olivine phenocrysts are weakly oriented and tend to 
> occur in clusters.  Textures and mineral compositions are similar to 
> those in olivine-orthopyroxene-phyric shergottite NWA 1195, but the 
> olivine cores in NWA 2046 are more magnesian (Irving et al., 2004).  
> Specimens: type specimen, 12.2 g, and one polished thin section, NAU; 
> one polished thin section, UWS; main mass, Strope.
> 
> [snip]
> 
> 
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