Northwest Africa 4527 Martian Meteorite

Image of two original NWA 4527 stones.
Image of two original NWA 4527 stones.

Official Meteoritical Bulletin entry for Northwest Africa 4527:

Northwest Africa 4527
     Find: Summber 2006
     Achondrite (Martian, basaltic shergottite)

History: The stones were recovered in Algeria in summer 2006 and G. Hupé purchased them in M'Hamid, Morocco in July 2006
Physical characteristics: The meteorite consists of two broken, brown stones weighing 10.06 g. The stones have weathering rinds ~2 mm thick.
Petrography: (A. Irving and S. Kuehner, UWS) Olivine occuring with either prismatic low-Ca pyroxene phenocrysts or chromite microphenocrysts is set in a matrix of pigeonite, maskelynite, Ti-chromite, ilmenite, merrillite and pyrrhotite. Minor veinlets of calcite and barite are present.
Mineral compositions: Olivine phenocrysts are zoned from Fa19.8-22.4 cores to Fa49.2-50.9 rims (FeO/MnO = 41-56); pyroxene phenocrysts are zoned from orthopyroxene cores (Fs22.8Wo4.1, FeO/MnO = 40) to pigeonite rims (Fs40.1Wo11.9, FeO/MnO = 40); olivine microphenocrysts Fa32.7 (FeO/MnO = 51); maskelynite (An53.7-66.4Or0.7-0.1); matrix chromite is relatively Ti-rich, whereas chromite occurring as microphenocrysts and as inclusions in olivine phenocrysts is Ti-poor and Mg-rich.
Classification: Achondrite (Martian, basaltic shergottite).
Type specimens: A total of 2.1 g of sample and one thin section are on deposit at UWS. GHupé holds the main mass.

Scientific abstracts and news regarding NWA 4527:

Kuehner S.M., Irving A.J., Herd C.D.K., Gellissen M., Lapan T.J. and Rumble D.
(2011) Pristine olivine-phyric Shergottite NWA 6162:
A primitive magma with accumulated crystals derived from depleted Martian mantle (abs#1610).
42nd Lunar Planet. Sci. Conf.,
Lunar Planetary Institute @ The Woodlands.

Nishiizumi K., Nagao K., Caffee M.W. Jull A.J.T. and Irving A.J.
2011) Cosmic-ray exposure chronologies of depleted olivine-phyric Shergottites (abs#2371).
42nd Lunar Planet. Sci. Conf.,
Lunar Planetary Institute @ The Woodlands.

Franz H.B., Farquhar J. and Irving A.J.
(2010) Acid volatile sulfur isotopic composition of seven Shergottites from Northwest Africa (abs#2341).
Lunar Planet. Sci. XLI.
Lunar Planetary Institute Houston.

Rumble D. and Irving A.J.
(2009) Dispersion of oxygen isotopic compositions among 42 Martian meteorites determined by laser fluorination:
Evidence for assimilation of (ancient) altered crust (abs#2293). Lunar Planet. Sci. XL,
Lunar Planetary Institute @ The Woodlands.

Connolly H.C. and 7 authors
(2007b) TheMeteoriticalBulletin, No.92, September.
Meteorit. & Planet. Sci. 42, 1647-1694.

298mg polished part slice of NWA 4527.
298mg polished part slice of NWA 4527.
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Description coming Soon!

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