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Basic information Name: Noyon
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2018
Country: Mongolia
Mass:help 745 g
Meteoritical Bulletin:  MB 109  (2020)  LL(L)3
Recommended:  LL(L)3    [explanation]

This is 1 of 24 approved meteorites classified as LL(L)3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 9 May 2020
Writeup from MB 109:

Noyon        43°13’11.8"N, 102°39’56.7"E

Omnogovi, Mongolia

Find: 2018 Aug 25

Classification: Ordinary chondrite (LL(L)3)

History: Meteorite (one sample - 745.47 g) was found 25 August 2018 by the UrFU - IAG-MAS meteorite expedition-2018 in southern Gobi (Pastukhovich A.Yu., Kolunin R.N., Larionov M.Yu., Muraviev L.A., Petrova E.V., Yakovlev G.A., Naasa Ochir) in 45 km East of Noyon, the Ömnögovi aimag (province), Mongolia.

Physical characteristics: Size is 10x5x5 cm. The meteorite has roughly rounded shape. Exterior of the stone is desert polished. The surface and interior of the meteorite are gray to dark brown in color due to Fe-hydroxides. Fusion crust is locally present.

Petrography: Classification (Victor V. Sharygin, SIGM and UrFU). The meteorite shows a chondritic texture. The amount of chondrules and their fragments is more than 90 vol.%. Chondrules are well delineated. Average chondrule apparent diameter 1008±442 μm (n=20). Chondrule apparent diameter up to 2 mm. Chondrules are represented by BO, PO, POP, RP and CC textural types. Chondrules mainly consist of olivine, low-Ca-pyroxene and glassy-like (cryptocrystalline) matrix, diopside, ±chromite and blebs of troilite and FeNi-metal. In all chondrules the mesostasis does not contain fresh glass, and is a finely devitrified aggregate of clinopyroxene and feldspar or nepheline-like phase. BSE images for some POP and PO chondrules show strong zonation for olivine and sometimes low-Ca-pyroxene, which can form skeletal/dendritic crystals. RP chondrules may contain SiO2 polymorph. All these indicate the high rate of quenching. Olivine and low-Ca-pyroxene are main minerals in fine-grained matrix; plagioclase was not observed. All petrographic features indicate a petrological type of 3 for the meteorite. Undulatory extinction and irregular fractures in olivine reveal a shock stage of S2. Majority of grains of FeNi-metal (30-400 µm) are mainly represented by kamacite, taenite and tetrataenite; but individual grains of kamacite also occur. Weathering products (hematite, goethite and other Fe-Ni-hydroxides, gypsum) are locally abundant and mainly occur as in situ partial alteration of FeNi-metal and troilite, and fill microfractures in all minerals (weathering grade – W2-3). The appearance of Ni-rich pyrrhotite and smythite maybe related to troilite alteration. Clinopyroxene, chromite, ilmenite, merrillite and chlorapatite (100-300 µm) occur locally in the matrix. Merrillite was also as rounded inclusions (up to 5 µm) in FeNi-metal and troilite. The abundances of FeNi-metal and sulfides are 3.5 and 4.3 vol.%, respectively (by point counting over 670 mm2, Pastukhovich A.Yu.).

Geochemistry: Mineral composition and Geochemistry: EDS-WDS analyses (V.V. Sharygin, SIGM and UrFU). The primary chondrite paragenesis includes olivine, low-Ca-pyroxene, Cr-bearing clinopyroxene (Cr2O3 - up to 2.6 wt.%), plagioclase, spinel-supergroup minerals, ilmenite, chlorapatite, merrillite, FeNi-metal, SiO2 polymorph, troilite and maybe pyrrhotite. The main minerals drastically vary in composition. The averaged olivine is Fa21.47±7.10 (N=100). The olivine grains from matrix have homogeneous composition – Fa26.78±0.95 (N=30), max – Fa28.83. However zoned olivine crystals in chondrules show a wider range: Fa19.31±7.50 (n=70). The same situation exists with low-Ca-pyroxene: average - Fs13.51±7.98Wo2.04±2.45 (N=63); matrix – Fs18.53±6.5.13Wo2.04±2.55 (N=19), max – Fs24.6; chondrules (N=44): average - Fs11.38±8.09Wo2.05±2.43 (N=63); core (min) – Fs2.87, rim (max) – Fs36.85. The maximal values of Fa and Fs in olivine and low-Ca pyroxene outline the LL group, whereas high standard deviations for these minerals in chondrules may indicate subtype 3.0-3.3. Plagioclase is rare and found only in matrix of some POP chondrules: anorthite An76.6Ab21.7Or1.7 (N=4) occurs in the POP chondrules with zoned olivine, whereas albite Ab89.6An5.1Or5.4 (N=8) is common of other POP chondrules. Spinel-supergroup minerals are represented by chromite Crt89.6Spl4.5 (N=10, common in matrix and chondrules) and zoned Cr-rich spinel (in some chondrules) with composition from Spl58.6Crt39.9 (core) to Spl82.0Crt16.1 (rim). Ilmenite is Ilm87.3 (N=7). Composition of metals (in wt.%): kamacite (N=25) – Fe 93.62±0.85, Ni – 5.63±0.86, Co – 0.82±0.13; taenite (N=10) – Fe 60.76, Ni 38.93, Co 0.22; tetrataenite (N=12) – Fe 49.52, Ni 50.33, Co 0.16. Nepheline-normative glassy-like aggregate (or nepheline ?) in a POP chondrule with zoned olivine has following composition (in wt.%, N=12): SiO2 48.58, Al2O3 28.42, TiO2 1.18, Cr2O3 0.62, FeO 2.52, MgO 0.69, CaO 0.57, Na2O 14.97, K2O 2.28.

Classification: Ordinary chondrite. LL(L)3, S2, W2-3. In variations of Fa in olivine and Fs in low-Ca pyroxene in chondrules it seems to be related to 3.0-3.3 subtype. Chondrule size points to LL, but the metal content points to L, hence the LL(L) designation.

Specimens: 636 g sample – IAG-MAS; 102.72 g sample – UrFU; 6.75 g cut-off and thin section – SIGM.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:gravel surface
Date:2018 Aug 25
Mass (g):745.47
Shock stage:S2
Weathering grade:W2-3
Fayalite (mol%):21.47±7.10 (1.39-28.83, N=100)
Ferrosilite (mol%):13.51±7.98 (2.87-36.85, N=63)
Wollastonite (mol%):2.04±2.45 (0.19-9.65, N=63)
Classifier:Victor V. Sharygin, SIGM and UrFU
Type spec mass (g):102.72
Type spec location:UrFU
Main mass:IAG-MAS
Finder:UrFU-IAG-MAS meteorite expedition – Southern Gobi-2018
Comments:Submitted by Victor V. Sharygin, SIGM and UrFU
   and collections
UrFU: Ural Federal University, 620002, 19 Mira street, Ekaterinburg, Russia (institutional address; updated 14 Jan 2015)
SIGM: V.S. Sobolev Institute of Geology and Mineralogy SB RAS, pr. Akademika Koptyuga, 3 Novosibirsk, 630090, Russia; Website (institutional address; updated 10 May 2017)
IAG-MAS: Institute of Astronomy and Geophysics Mongolian Academy of Sciences P.O.B-152, Ulaanbaatar – 51, 13343, Mongolia (institutional address; updated 30 Nov 2019)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Public domain photographs:
Victor V. Sharygin      

     Recommended::   (43° 13' 12"N, 102° 39' 57"E)

     This is 1 of 3 approved meteorites from Omnogovi, Mongolia
     This is 1 of 12 approved meteorites from Mongolia (plus 4 unapproved names) (plus 1 impact crater)
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