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| Sidi Ali Ou Azza | |||||||||||||||||||||||||||||||||||||||
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| Basic information | Name: Sidi Ali Ou Azza This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: Yes, confirmed fall Year fell: 2015 Country: Morocco Mass:  1500 g | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 2105 approved meteorites (plus 5 unapproved names) classified as L4. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||||||||||
| Comments: | Approved 22 Feb 2016 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 105:
Sidi Ali Ou Azza 29°47’2.9"N, 7°23’21.8"W Guelmim-Es-Semara, Morocco Confirmed fall: 28 Jul 2015 Classification: Ordinary chondrite (L4) History: (H. Chennaoui Aoudjehane FSAC, A. Aaranson, A. Bouragaa, A. Bouferra). On Tuesday, 28 July 2015, around 5:30 pm local time (6:30 pm GMT), many people from Tissint and its vicinity heard three sonic booms in the direction of Sidi Ali Ou Azza. Immediately, numerous people begin searching for the meteorite in the area. Two days after the fall, many small pieces from 5 to 109 g (so far: 109, 100, 75, 50, 40, 37, 20, 10, 7, and 5.7 g) were recovered close to Sidi Ali Ou Azza and El Kharoua’ well, a few km west of Tissint. Most pieces are complete and mostly covered by black fusion crust. The interior is dark and brecciated, with a few clear gray zones. Numerous small and well-defined chondrules are visible as well as sulfides and metals. The direction of the fall was from north to south; the strewnfield is ~4 km long. Physical characteristics: Black and brown patchy fusion crust. A saw cut reveals numerous, distinct chondrules and fine grained metal/sulfide. A dark angular clast, ~5 mm, was also observed. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous porphyritic chondrules, a few BO chondrules, and an enstatite-rich chondrule. Mesostasis and very fine-grained plagioclase is ubiquitous. Kamacite, taenite, troilite, chromite, and a phosphate phase were observed throughout. The dark angular clast described above has an igneous texture with ~50% zoned euhedral olivines (up to 50 μm) and ~50% fine spinifex quench crystals, with sparse scattered metal or sulfide blebs (up to 10 μm). Geochemistry: (C. Agee and N. Muttik, UNM) Chondrule olivine Fa25.7±0.9, Fe/Mn=50±3, Cr2O3=0.03±0.03 (wt%), n=24; chondrule low-Ca pyroxene Fa20.4±1.7, Fe/Mn=29±1, n=10; chondrule enstatite Fs2.1±0.2Wo0.6±0.2, n=2; plagioclase An8.3±3.9Ab86.9±3.1Or4.9±0.9. Clast olivine Fa19.3±4.1, Fe/Mn=47±4, Cr2O3=0.45±0.21 (wt%), n=6. Classification: Ordinary chondrite, L4 Specimens: 20.8 g, UNM; 10.7 g, FSAC | ||||||||||||||||||||||||||||||||||||||
| Data from: MB105 Table 0 Line 0: |
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| 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) FSAC: Universite Hassan II Casablanca, Faculte des Sciences Ain Chock, Departement de Géologie, BP 5366 Maârif, Casablanca, Morocco (institutional address; updated 9 Jan 2013) UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015) Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010) |
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| References: | Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography:
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Statistics: This is 1 of 16 approved meteorites from Guelmim-Es-Semara, Morocco (plus 2 unapproved names) This is 1 of 2163 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||||||
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