Meteoritical Bulletin: Entry for Northwest Africa 2736

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Northwest Africa 2736

Basic information

Name: Northwest Africa 2736
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2736
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass: 171.5 g

Classification
history:

Meteoritical Bulletin:	MB 90	(2006)	Aubrite
Recommended:			EL-melt rock [explanation]

This is 1 of 26 approved meteorites classified as EL-melt rock. [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), Enstatite-rich meteorites, and Melted chondrites

Comments:

Approved 3 Feb 2006
Revised 1 Sep 2019: Reclassified by Rubin (2016)

Writeup

help

Writeup from MB 90:

Northwest Africa 2736

Northwest Africa

Find: September 2004

Achondrite (aubrite)

History: M. Killgore purchased a 171.51 g stone in September 2004.

Petrography: (D. Hill, K. Domanik, and J. Lowe, UAz; Franchi, OU) The meteorite is made up primarily of enstatite (~60 vol%) and plagioclase (30 vol%) that are 50– 100 µm in size with an equigranular igneous texture. The groundmass is cross-cut by an extensive network of (oxidized) kamacite and daubreelite veins that follow silicate grain boundaries. An unusual feature of this meteorite is large, euhedral graphite up to 500 µm in length within kamacite veins and interstitial to the silicates. Several round inclusions up to 2 mm in diameter that contain bars of enstatite and plagioclase are observed.

Composition: Enstatite (En₉₉Fs₀Wo₁; avg. mg# = 9), plagioclase (Ab_78.8An_15.9Or_5.3). Oxygen isotopes: (I. Franchi, OU) δ¹⁷O = 2.017, δ¹⁸O = 3.732, ∆¹⁷O = 0.076 (all ‰). Classification: Achondrite (aubrite); low shock, moderate weathering.

Specimens: A total of 37.14 g of type specimens are on deposit at UAz. M. Killgore holds the main mass.

Writeup from MB 108:

Northwest Africa 2736: reclassification

Rubin (2016) reclassified Al Haggounia 001 and paired specimens as "vesicular, incompletely melted, EL chondrite impact melt rock[s]." NWA 2736 is likely paired, and is therefore also reclassified.

Bibliography:

Rubin A.E. (2016) Impact melting of the largest known enstatite meteorite: Al Haggounia 001, a fossil EL chondrite. Meteorit. Planet. Sci. 51 1576-1587. (link)

Plots:

O isotopes:

Institutions
and collections

OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
Killgore: Marvin and Kitty Killgore, Southwest Meteorite Laboratory, P.O. Box 95, Payson, AZ 85547, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

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