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Sarir Tazirbu 001
Basic information Name: Sarir Tazirbu 001
     This is an OFFICIAL meteorite name.
Abbreviation: ST 001
Observed fall: No
Year found: 2020
Country: Libya
Mass:help 18.1 g
Classification
  history:
Recommended:  C2-ung    [explanation]

This is 1 of 25 approved meteorites classified as C2-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and Ungrouped chondrites
Comments: Approved 18 Dec 2021
Writeuphelp
Writeup from MB 110:

Sarir Tazirbu 001 (ST 001)        25.845°N, 20.698°E

Al Kufrah, Libya

Purchased: 2020 Nov

Classification: Carbonaceous chondrite (C2, ungrouped)

History: Two small black, partially fusion-crusted stones found together in eastern Libya ~40 km NW of Tazirbu were purchased from the finder by Mbark Arjdal in November 2020.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL; L. Garvie, ASU) Very small chondrules (apparent diameter 310±110 µm, N = 21) composed mainly of forsterite, enstatite, aluminous diopside and minor pigeonite together with strongly zoned angular olivine grains are set in a very fine grained matrix (~50 vol.%, almost opaque black in thin section). Accessory phases identified by electron microprobe analysis include iron sulfide, pentlandite, kamacite, cronstedtite and serpentine. No CAI were observed. The powder X-ray diffraction pattern shows reflections for serpentine and a broad low-angle reflection consistent with smectite. The pattern is dominated by strong reflections for olivine, dolomite, magnetite, maghemite, clinoenstatite, pyrrhotite, pentlandite and minor calcite. These reflections sit on a broad, but intense scattering centered around 32° 2theta (Cu K alpha), consistent with amorphous scattering.

Geochemistry: Olivine (Fa27.9±19.6, range Fa1.0-54.5, N = 9), enstatite (Fs1.7±0.6Wo2.5±1.6, range Fs1.3-2.1Wo1.1.4-3.6, N = 2), pigeonite (Fs5.4Wo7.0), subcalcic augite (Fs34.0Wo30.4), aluminous diopside (Fs1.2±0.1Wo40.5±2.5, range Fs1.1-1.3Wo42.3-38.7, Al2O3 3.7-7.9 wt.%, TiO2 0.8 wt.%, N = 2). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O -2.677, -5.853, -2.810; δ18O 4.039, -1.154, 3.537; Δ17O -4.809, -5.244, -4.677 per mil (all data linearized).

Classification: Carbonaceous chondrite (C2-ungrouped). Although this specimen shares some attributes with ungrouped C2 chondrite Telakoast 001, including very similar textures, some mineral compositions, and oxygen isotopes plotting in the same region below the CCAM trend, the presence of minor serpentine and smectite sets it apart, and leads to an assignment of petrologic type 2.

Specimens: 6.7 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Al Kufrah
Place of purchase:Libya
Date:P 2020 Nov
Latitude:25.845°N
Longitude:20.698°E
Mass (g):18.13
Pieces:2
Class:C2-ung
Shock stage:S1
Weathering grade:low
Fayalite (mol%):27.9±19.6
Ferrosilite (mol%):1.7±0.6; 1.2±0.1
Wollastonite (mol%):2.5±1.6; 40.5±2.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):6.7
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 770; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Public domain photographs:
A. Irving      
Geography:

Libya
Coordinates:
     Recommended::   (25° 50' 42"N, 20° 41' 53"E)

Statistics:
     This is 1 of 3 approved meteorites from Al Kufrah, Libya (plus 2 unapproved names) (plus 2 impact craters)
     This is 1 of 1529 approved meteorites from Libya (plus 23 unapproved names) (plus 2 impact craters)
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