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Alatage Mountain 047
Basic information Name: Alatage Mountain 047
     This is an OFFICIAL meteorite name.
Abbreviation: AM 047
Observed fall: No
Year found: 2012
Country: China
Mass:help 50 kg
Recommended:  L-melt rock    [explanation]

This is 1 of 43 approved meteorites classified as L-melt rock.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Jun 2021
Writeup from MB 110:

Alatage Mountain 047 (AM 047)        41.683°N, 92.933°E

Xinjiang, China

Find: 2012 Sep

Classification: Ordinary chondrite (L, melt rock)

History: Found by geologist Jianming Wang in September 2012 while they were conducting fieldwork in the Alatage Mountain region, Xinjiang Province, China.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen retains remnants of a clastic breccia structure, but textural features indicate that it has been pervasively melted. Composed predominantly of extremely fine-grained silicate-rich regions containing sporadic spherical sulfide globules. Silicate-rich regions contain some larger olivine grains, but consist mainly of tiny prismatic grains of olivine and pyroxene (zoned from low-Ca pyroxene cores to subcalcic augite rims) together with interstitial sodic plagioclase and accessory troilite, pentlandite, merrillite, chlorapatite and rare taenite. Kamacite is apparently absent. Sulfide globules are composed of troilite+pentlandite, are in places rimmed by phosphates, and exhibit secondary staining by iron oxides and iron chloride.

Geochemistry: Olivine (Fa24.2±0.7, range Fa23.2-25.0, N = 5), low-Ca pyroxene (Fs20.4±0.7Wo3.0±0.6, range Fs19.9-21.5Wo2.4=3.9, N = 4), subcalcic augite (Fs14.7±0.2Wo32.4±2.3, range Fs14.6-14.9Wo30.9-35.0, N = 3).

Classification: Ordinary chondrite (L-melt rock).

Specimens: 42.8 g including one polished thin section at UWB; remainder with WangZ.

Data from:
  Table 0
  Line 0:
Date:2012 Sep
Mass (g):50000
Class:L-melt rock
Shock stage:S6
Weathering grade:W1
Fayalite (mol%):24.2±0.7
Ferrosilite (mol%):20.4±0.7
Wollastonite (mol%):3.0±0.6
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):42.8
Type spec location:UWB
Main mass:WangZ
Finder:J. Wang
Comments:Work name WZY-20; submitted by A. Irving
   and collections
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)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     Recommended::   (41° 40' 59"N, 92° 55' 59"E)

     This is 1 of 278 approved meteorites from Xinjiang, China (plus 5 unapproved names)
     This is 1 of 433 approved meteorites from China (plus 12 unapproved names) (plus 1 impact crater)
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