|Northeast Africa 003|
|Basic information||Name: Northeast Africa 003|
This is an OFFICIAL meteorite name.
Abbreviation: NEA 003
Observed fall: No
Year found: 2000
Mass: 124 g
This is 1 of 2 approved meteorites classified as Lunar (bas. breccia). [show all]
Search for other: Lunar meteorites
Approved 16 Jan 2006|
Revised 3 Feb 2006: Revised writeup
Writeup from MB 90:
Northeast Africa 003 30°28′N, 13°33′E
Find: November 2000/December 2001
Achondrite (lunar, mare basalt and basaltic breccia)
History: A dark gray, 6 g stone was found by a prospector 12 km NW from Al Qaryah ash Sharqiyah in Wadi Zamzam area, Libya, in December 2001. A stone of 118 g with incomplete fusion crust was found nearby in December 2001.
Petrography: (J. Haloda and P. Tycova, PCU) The meteorite contains two adjacent parts, mare basalt and basaltic breccia, both of which were investigated in detail. The main portion (~75 vol%) of the meteorite is coarse-grained, low-Ti olivine-rich basalt, showing porphyritic texture of olivine (Fo19–73), zoned pyroxene (En5–71Wo6–38), and plagioclase (An84–92) with late-stage mesostasis containing silica, Fe-rich pyroxene and pyroxferroite, plagioclase, ilmenite, troilite, and apatite. Opaque phases include chromite, Ti-rich chromite, ulvöspinel, ilmenite, troilite, and trace Fe,Ni metal; shock veins and impact melt pockets are present. All plagioclase is totally converted to maskelynite. Mineral modes are (vol%) olivine = 17.5, pyroxene = 60.6, plagioclase = 18.2, ilmenite = 1.2, spinel = 0.8, mesostasis + impact melt = 1.8.
Geochemistry: Bulk composition: SiO2 = 44.7, TiO2 = 1.3, Cr2O3 = 0.5, Al2O3 = 8.0, FeO = 21.8, MnO = 0.3, MgO = 13.6, CaO = 9.2, Na2O = 0.3, K2O = 0.1 (all wt%), Fe/Mn = 81. Concentration of selected elements (INAA; R. Korotev, Wash U) Sc = 50.8, Co = 50.5, Ni = 84, Hf = 1. 1, Ta = 0. 15, Th = 0.43, U = 0.2 (all ppm); REE pattern is flat at 10 × CI with slight negative Eu anomaly, not depleted in LREE. Adjacent part is basaltic breccia (~25 vol%) consisting of well-consolidated glassy impact-melt matrix containing scattered mineral fragments of chemical composition identical with the coarse-grained low-Ti olivine-rich basalt and two larger clasts of low-Ti mare basalt lithologies. The low-Ti basaltic clasts are finer-grained and petrologically more evolved. No regolith component or highland material is present.
Classification: Achondrite (lunar mare basalt and basaltic breccia).
Specimens: A 20 g type specimen and two polished thin sections are on deposit at PCU. An anonymous finder holds the main mass.
PCU: Charles University, Faculty of Science, Institute for Cheochemistry, Mineralogy and Mineral Resources, Albertov 6, 128 43 Prague 2, Czech Republic (institutional address; updated 3 Mar 2011)
|References:||Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)|
This is 1 of 209 approved meteorites from Gharyan, Libya (plus 16 unapproved names)
This is 1 of 1476 approved meteorites from Libya (plus 20 unapproved names) (plus 4 impact craters)
Al Qaryah ash Sharqiyah (Met Bull 90)|
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