NWA 15341 这是经批准的四块 CO3 异常陨石之一。 碳质球粒狀隕石陨石 - 4.6 g - (1)

Northwest Africa 15341
(NWA 15341)

Co3 Anomalous (Co3-An)
Carbonaceous meteorite
Found in January 2022 In Mali
4.60 grams

This is only 1 of 4 meteorites ever to be classified as CO3 Anomalous
Carbonaceous meteorite.

EXTREMELY RARE AND SCIENTIFICALLY VALUABLE METEORITE

Classified and studied by world renowned and profoundly respected Dr Anthony J. Irving and team at Department of Earth and Space sciences, University of Washington.

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Meteoritical Bulletin database information:

Northwest Africa 15341
Basic information Name: Northwest Africa 15341
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15341
Observed fall: No
Year found: 2022
Country: Mali
Mass: 1210 g
Classification
history:
Recommended: CO3-an

This is 1 of 4 approved meteorites classified as CO3-an.
Comments: Approved 4 Apr 2024
Writeuphelp
Writeup from MB 113:
Northwest Africa 15341 (NWA 15341)

Mali

Purchased: 2022 Jan

Classification: Carbonaceous chondrite (CO3-an)

.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Well-formed, relatively small chondrules (apparent diameter 230±170 µm, N = 26) containing glass or devitrified glass, plus some mineral fragments, AOA and very fine grained amoeboid CAI, are set in a fine grained matrix (~30 vol.%, red-brown in thin section) containing chromite, taenite, troilite and Cr-magnetite (associated with taenite and troilite). No kamacite was found.

Geochemistry: Olivine (Fa23.1±20.4, range Fa0.7-56.1, N = 14; Cr2O3 in ferroan olivine 0.05-0.28 wt.%, mean 0.13 wt.%, sd 0.08 wt.%, N = 8), low-Ca pyroxene (Fs5.3±3.0Wo1.6±1.5, range Fs1.2-8.0Wo0.3-3.8, N = 4), diopside (Fs1.6±0.3Wo44.1±6.0, range Fs1.3-1.8Wo39.8-48.3, N = 2), Al-Ti-diopside in CAI (Fs1.7Wo50.2; Fs0.9Wo54.4; Al2O3 5.6-10.9 wt.%, TiO2 0.2-1.4 wt.%; N = 2), magnetite (Cr2O3 1.8-13.1 wt.%, N = 11).

Classification: Carbonaceous chondrite (CO3, anomalous). Although magnetite is present in some low subtype CO3 chondrites. ( Rubin and Li, 2019), it is relatively Cr-poor (containing < 1 wt.% Cr2O3). The occurrence of relatively Cr-rich magnetite (containing up to 13 wt.% Cr2O3) as found in this specimen has not been previously reported in CO3 chondrites.


Bibliography:
Rubin A. E. and Li Y. (2019) Formation and destruction of magnetite in CO3 chondrites and other chondrite groups. Geochemistry 79, 125528. (Link)
Data from:
MB113
Table 0
Line 0:
Place of purchase: Mali
Date: P 2022 Jan
Mass (g): 1210
Pieces: many
Class: CO3-an
Shock stage: S2
Weathering grade: low
Fayalite (mol%): 23.1±20.4
Ferrosilite (mol%): 5.3±3.0
Wollastonite (mol%): 1.6±1.5
Classifier: A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g): 27.0
Type spec location: UWB