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Mont Tourniat 001
Basic information Name: Mont Tourniat 001
     This is an OFFICIAL meteorite name.
Abbreviation: MtT 001
Observed fall: No
Year found: 2023
Country: Mauritania
Mass:help 17.7 kg
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  Pallasite, ungrouped
Recommended:  Pallasite, ungrouped    [explanation]

This is 1 of 12 approved meteorites classified as Pallasite, ungrouped.   [show all]
Search for other: Metal-rich meteorites, Pallasites
Comments: Approved 21 Aug 2023
Writeuphelp
Writeup from MB 112:

Mont Tourniat 001 (MtT 001)        22°56’56.24"N, 08°29’32.68"W

Tiris Zemmour, Mauritania

Find: 2022

Classification: Pallasite (ungrouped)

History: Found in Mauritania, 2022, approximately 80 km northeast of Mont Tourniat. Purchased by Darryl Pitt in 2023

Physical characteristics: Single mass with a dark-brown, irregular-shaped, sandblasted exterior surface with exposed, evenly distributed, light brown-orange silicates. Sawcut surface of the deposit sample shows approximately 60% metal and 40% non-metals. Olivine crystals occur as subhedral to angular shapes and have predominantly green cores with orange rims and are also associated and intermingled with aggregates of other non-metal phases.

Petrography: (C. Agee, UNM) Reflected light microscopy and electron microprobe analyses and imaging reveals kamacite as the dominant metal phase, taenite is much less abundant. Non-metal phases are olivine, farringtonite, orthopyroxene, troilite, chromite, and schreibersite. Farringtonite is ubiquitous with some grains up to 1 mm in diameter sometimes completely mantling smaller olivine grains. Orthopyroxene occurs primarily as 100-300 μm grains aggregated around and mantling large olivine and farringtonite grains and forming boundaries between metal domains and olivine or farringtonite grains. No phosphoran olivine, merrillite or stanfieldite were detected in the deposit sample.

Geochemistry: (M. Spilde, UNM) Olivine Fa21.2±0.6, Fe/Mn=43±2, Fe/Mg=0.27±0.01, n=10; low-Ca pyroxene Fs18.8±0.3Wo0.2±0.0, Fe/Mn=28±1, n=6; farringtonite P2O5=51.7±1.9, MgO=42.1±0.3, FeO=4.5 (wt%), Fe/Mn=14±1, n=8. Oxygen isotopes (K. Ziegler, UNM): 4 acid-washed fragments analyzed by laser fluorination gave δ18O= 2.638, 3.444, 3.449, 3.591; δ17O= 1.235, 1.616, 1.626, 1.729; Δ17O= -0.136, -0.175, -0.168, -0.139 (linearized, all per mil, TFL slope=0.52).

Classification: Pallasite ungrouped. This is a pyroxene pallasite with oxygen isotopes that plot near the Main Group array. This meteorite has the highest Fa and Fe/Mg values of any published pallasite, significantly higher than the "high-FeO PMG-as" subgroup (McKibben et al. 2019). The modal abundance of farringtonite is unusually high.

Specimens: 66 g end-cut on deposit at UNM, DPitt holds the main mass.

Bibliography:
  • McKibbin S. J., Pittarello L., Makarona C., Hamann C., Hecht L., Chernonozhkin S. M., Goderis S. and Claeys P. (2019) Petrogenesis of main group pallasite meteorites based on relationships among texture, mineralogy, and geochemistry. Meteoritics & Planetary Science 54, 2814–2844. (link)
Data from:
  MB112
  Table 0
  Line 0:
State/Prov/County:Tiris Zemmour
Date:2022
Latitude:22°56'56.24"N
Longitude:08°29'32.68"W
Mass (g):17700
Pieces:1
Class:Pallasite, ungrouped
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):21.2±0.6
Ferrosilite (mol%):18.8±0.3
Wollastonite (mol%):0.2±0.0
Classifier:C. Agee, UNM
Type spec mass (g):66
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Fieldname S-80; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Geography:

Mauritania
Coordinates:
     Recommended::   (22° 56' 56"N, 8° 29' 33"W)

Statistics:
     This is 1 of 28 approved meteorites from Tiris Zemmour, Mauritania (plus 1 impact crater)
     This is 1 of 221 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)
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