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Itqiy meteorite, al-Saqiyah al-Hamra'a (Saguia el Hamra), Western Sahara

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Latitude & Longitude (WGS84): 26° 35' 26'' North , 12° 57' 7'' West
Latitude & Longitude (decimal): 26.59083,-12.95222
GeoHash:G#: eswz328qz
Other regions containing this locality:Northwest Africa Meteorites
Sahara Desert, North Africa
Locality type:Meteorite Fall Location
Meteorite Class:Anomalous EH7 chondrite meteorite
Meteoritical Society Class:EH7-an
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:BWh : Hot deserts climate


Primitive Enstatite Achondrite [or Shock-melted Enstatite Chondrite]
1990 fall. 2 pieces, 410g and 4310g.

After a striking burst of light-and-sound, a 410 g stone was recovered by a nomad. A decade later a 4.31 kg stone was recovered — and the news of Itqiy spread. The dominant constituent of Itqiy is enstatite accompanied by kamacite (~ 25 vol%) and tiny kamacite-sulfide intergrowths. The very reduced mineralogy, the oxygen isotopes, and the cosmic ray exposure age all indicate that Itqiy is a member of the Enstatite-rich meteorite clan, initially described as an Enstatite chondrite, but beyond that classification is elusive. The enstatite resembles that of EL chondrites, but the metal is closer in composition to that of EH chondrites. Furthermore, Itqiy lacks chondrules and chondrule relics. This may be entirely due to impact melting from pre-terrestrial shock, but that is a hypothesis — not a conclusion. To begin with there is apparently no consensus on the level of shock.

The actual issues are deeper than that. Over two decades ago Klaus Keil (1989) argued that the Enstatite meteorites were derived from a minimum of four parent bodies (EH and EL chondrites, normal aubrites, and the Shallowater parent body). Recently, however, it has become increasingly difficult to accommodate several Enstatite meteorites into the four homeworld framework. Worlds which have been completely melted (e.g., Happy Canyon, Itqiy, NWA 2526) are especially difficult to understand. First, disentangling the effects of internally generated metamorphism from external shock(s) is difficult. Secondly, it is not clear whether all of the Enstatite-rich oddballs are derived from the four putative homeworlds. Recently, Keil and Bischoff (2008) have proposed that Itqiy and NWA 2526 may be derived from a fifth parent body.

Good Initial Reference:
Patzer, A., Hill, D. H. & Boynton, W. V. (2001) Itqiy: A metal-rich enstatite meteorite with achondritic texture, Meteoritics & Planetary Science 36 (11): 1495-1505. (Nov 2001).


Mineral List


9 valid minerals.

Meteorite/Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Tertiary
2.588 - 66 Ma



ID: 3306497

Age: Cenozoic (2.588 - 66 Ma)

Lithology: Sedimentary

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

Neogene
2.588 - 23.03 Ma



ID: 3185124
Cenozoic sedimentary rocks

Age: Neogene (2.588 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Eocene - Paleocene
33.9 - 66 Ma



ID: 3137277
Palaeocene undifferentiated

Age: Paleogene (33.9 - 66 Ma)

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Keil, K. (1989). Enstatite meteorites and their parent bodies, Meteoritics 24 (4): 195-208. (Dec 1989)
Patzer, A. et al., (2001) Itqiy: II. a Short Story About Its Noble Gases and Oxygen Isotopes, Meteoritics & Planetary Science 36 (Supplement): p. A158. (Sept 2001)
Grossman, J. N. & Zipfel, J. (2001). The Meteoritical Bulletin, No. 85, 2001, Meteoritics & Planetary Science 36 (Supplement): A293-A322. (Sept 2001)
Patzer, A., Hill, D. H., & Boynton, W. V. (2001). Itqiy: A metal‐rich enstatite meteorite with achondritic texture. Meteoritics & Planetary Science, 36(11), 1495-1505.
Keil, K. & Adolf Bischoff, A. (2008) Northwest Africa 2526: A partial melt residue of enstatite chondrite parentage, Meteoritics & Planetary Science 43 (7): 1233-1240. (July 2008)
Niekerk, D., Keil, K. & Humayun, M. (2014) Petrogenesis of anomalous Queen Alexandra Range enstatite meteorites and their relation to enstatite chondrites, primitive enstatite achondrites, and aubrites: Meteoritics & Planetary Science, Online Early. (Mar 2014)

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