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Teghaza 001
Basic information Name: Teghaza 001
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2022
Country: Mali
Mass:help 799 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 324 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 4 Apr 2024
Writeuphelp
Writeup from MB 113:

Teghaza 001        23.031765, -4.646299

Gao, Mali

Find: 2022

Classification: Martian meteorite (Shergottite)

History: This meteorite was found at the beginning of September 2022 during a meteorite search expedition north of the archaeological area of Taghaza in Mali, by Sahrawi meteorite hunters. The find locality is approximately 73 km SSE of Teghaza, and 34 km ENE of Bir Chali. Eight identically appearing stones were found at this locality. The largest stone is 442 g.

Physical characteristics: The eight recovered stones lack fusion crust and their sandblasted surfaces show a mix of fine dark grains. The largest pieces have caliche coatings where they were buried in the desert pavement. Freshly broken surfaces reveal light-colored and brown-orange grains and shiny clear maskelynite.

Petrography: (A. Ross and C. Agee, UNM) Backscatter electron images, SEM images, and reflected light microscopy show that this meteorite is made up of approximately 50% pyroxene and 40% maskelynite. Some of the pigeonitic pyroxenes have exsolution lamellae and the sub-calcic augites occur as separate phases, both are unzoned and compositionally equilibrated. A significant proportion of the pyroxene grains show layered alteration phases in their cores. The alteration is made up of thin layers of Fe-oxide and Mn-oxide with low microprobe totals consistent with ferrihydrite and manganese hydroxide. Most plagioclase has been transformed to maskelynite, however some fine-grained perthitic patches with higher orthoclase contents up to Or11 are present. Other minor ubiquitous phases include ilmenite, Ti-Cr spinel, Fe-sulfide, silica, and Cl-rich apatite.

Geochemistry: (A. Ross and C. Agee, UNM) Pigeonite Fs41.0±4.1Wo9.7±3.0, Fe/Mn=33±1, n=7; sub-calcic augite Fs25.1±1.5Wo36.0±0.2, Fe/Mn=31±1, n=4; maskelynite An48.5±4.3Ab49.0±3.6, n=6. Oxygen isotopes (K. Ziegler, UNM): 5 acid-washed bulk meteorite fragments analyzed by laser fluorination gave δ18O= 6.231, 6.359, 6.872, 6.378, 5.897; δ17O= 3.516, 3.580, 3.871, 3.604, 3.323; Δ17O= 0.276, 0.273, 0.298, 0.288, 0.257; (linearized, all per mil, TFL slope=0.52).

Classification: Pyroxene-phyric shergottite. Martian meteorite based on Fe/Mn of pyroxenes and An-content of maskelynite. Δ17O is also consistent with SNC meteorites, however δ18O values are higher than the normal SNC range, likely due to the mixing of a primary SNC δ18O component with a higher δ18O alteration phase or phases such as observed in many pyroxene cores.

Specimens: 22 g including a probe mount on deposit at UNM, Bachir Salek holds the main mass.

Data from:
  MB113
  Table 0
  Line 0:
State/Prov/County:Gao
Place of purchase:Mali
Date:2022
Latitude:23.031765
Longitude:-4.646299
Mass (g):798.5
Pieces:8
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):41.0±4.1, 25.1±1.5
Wollastonite (mol%):9.7±3.0, 36.0±0.2
Classifier:C. Agee, UNM
Type spec mass (g):22
Type spec location:UNM
Main mass:Bachir Salek
Comments:Fieldname S-27; submitted by C. Agee
Plots: O isotopes:  
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Geography:

Mali
Coordinates:
     Recommended::   (23° 1' 54"N, 4° 38' 47"W)

Statistics:
     This is 1 of 33 approved meteorites from Gao, Mali (plus 1 unapproved name)
     This is 1 of 122 approved meteorites from Mali (plus 2 unapproved names)
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