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Acfer 059/El Djouf 001 meteorites, Tanezrouft, Tamanghasset Province, Algeria

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Latitude & Longitude (WGS84): 23° 25' 59'' North , 1° 25' 0'' West
Latitude & Longitude (decimal): 23.43333,-1.41667
Other regions containing this locality:Northwest Africa Meteorites
Sahara Desert, North Africa
Non-native locality type:Meteorite
Meteorite Type:CR2 chondrite meteorite
Köppen climate type:BWh : Hot deserts climate


Paired CR2 chondrite meteorites.
El Djouf 001 [Adrar], 1.25 kg, 30 fragments
Acfer [Tamanghasset]059,087,097,114,139,186,187,209,270,311;~1.8 kg

In 1993 with the aide of a number of coworkers, A. Bischoff spearheaded an effort which established to the satisfaction of the meteoritical community that a fragmented 1 kg meteorite found in Adrar, Algeria and a set of 10 small, somewhat scattered meteorites found in Tamanghasset, Algeria — 500 km away — were pieces of the same meteorite fall. The El Djouf 001 meteorite and the 10 Acfer meteorite fragments are still given separate listings at The Meteoritical Society's 'Meteorite Bulletin Database, but they are considered as a single meteorite in the literature. The meteorite is characterized by abundant chondrules and chondrule fragments (~ 60 vol%), very-fine grained matrix (~ 25 vol%), Fe-Ni metal (8-10 vol%), small dark clasts (~ 3-4 vol%) and rare CAI inclusions. Common properties of the chondrules, serpentine-rich phyllosilicate matrices, ubiquitous dark inclusions, unusual nitrogen isotopes, similar weathering histories, and cosmic ray exposure ages combine to set the fragments apart from other somewhat CR chondrites.

While the fragments share a plenitude of common properties, the detailed specifics of the dark inclusions are both intriguing and diverse. Hundreds have been studied and they usually represent 2-4 vol% of any given (numbered) fragment. The smectite-, magnetite-, and pyrrhotite-rich dark inclusions appear to have existed before the chondrules, metal, and matrix were brought together to form the CR parent body/bodies.

The comparatively large complement of solar wind components found in the meteorite suggest that the Acfer-El Djouf meteoroid itself appears to have existed as a very small object for about 6 million years before encountering the earth.

Mineral List


14 valid minerals.

Meteorite/Rock Types Recorded

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References

Weisberg, M. K. & Prinz, M. (1991) El Djouf 001: A new CR2 chondrite. Meteoritics 26 (4): 406-407. (Dec 1991).

Weber, D. & Bischoff, A. (1992). Mineralogy and chemistry of refractory inclusions in CR-like chondrites from the Sahara desert. In: Lunar and Planetary Institute Science Conference Abstracts 23: p. 1505. (Mar 1992).

Bischoff, A., Beckerling, W., Weber, D., & Zinner, E. (1992) Calcium-Dialuminate-bearing Inclusions from the Saharan Meteorites ACFER 182, ACFER 087 and El Djouf 001: an Ion Probe Study. Meteoritics 27 (3): p. 204. (July 1992)

Bischoff, A. & 13 others (1993) Paired Renazzo-type (CR) carbonaceous chondrites from the Sahara: Geochimica et Cosmochimica Acta 57 (7): 1587-1603. (Apr 1993)

Endress, M., Keil, K., Bischoff, A., Spettel, B., Clayton, R. N. & Mayeda, T. K. (1994) Origin of dark clasts in the ACFER 059/El Djouf 001 CR2 chondrite: Meteoritics 29 (1): 26-40. (Jan 1994).

Weber D. & Bischoff A. (1994) Grossite (CaAl4O7) - a rare phase in terrestrial rocks and meteorites: European Journal of Mineralogy 6, 591-594.

Werner, M., Ott, U. & Begemann, F. (1995) C, N and SI Isotopes from the El Djouf 001 (CR) Meteorite: Comparison with Murchison SiC. Meteoritics 30 (5): p. 598. (Sep 1995)

Varela, Maria Eugenia, Kurat, Gero, Hoppe, Petter & Brandstätter, Franz. (2002) Chemistry of glass inclusions in olivines of the CR chondrites Renazzo, Acfer 182, and El Djouf 001. Geochimica et Cosmochimica Acta 66 ( 9): 1663-1679. (May 2002).

Greshake, A., Krot, A. N. & Keil, K. (2004) Mineralogy and Chemistry of Fine-grained Matrices, Rims, and Dark Inclusions in the CR Carbonaceous Chondrites Acfer/El Djouf 001 and the Ungrouped Carbonaceous Chondrites Acfer 094 and Adelaide. Workshop on Chondrites and Protoplanetary Disk, pdf.9041. (Nov 2004)

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