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Dong Ujimqin Qi meteorite, East Ujimqin Banner (Dongwuzhumuqin Co.; Dongwu Qi), Xilin Gol League (Xilinguole Prefecture), Inner Mongolia, Chinai
Regional Level Types
Dong Ujimqin Qi meteoriteMeteorite Fall Location
East Ujimqin Banner (Dongwuzhumuqin Co.; Dongwu Qi)- not defined -
Xilin Gol League (Xilinguole Prefecture)- not defined -
Inner MongoliaAutonomous Region

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Name(s) in local language(s):, 锡林郭勒盟, 内蒙古自治区, 中国
Latitude & Longitude (WGS84): 45° 30' 0'' North , 119° 1' 59'' East
Latitude & Longitude (decimal): 45.50000,119.03333
GeoHash:G#: y8hduej2t
Locality type:Meteorite Fall Location
Meteorite Class:Mesosiderite meteorite
Meteoritical Society Class:Mesosiderite
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:Dwb : Monsoon-influenced warm-summer humid continental climate

Mesosiderite (Stony-Iron)
Fall, 7 Sept 1995; 128 kg

On a cloudless day a tremendous sound was heard, black smoke was seen, and 3 meteorite masses with fusion crusts were soon recovered, the largest 88.2 kg. Dong Ujimqin Qi was only the 7th witnessed mesosiderite fall. Mesosiderites normally consist of approximately equal masses of once molten Fe-Ni metal which may have penetrated into a nearly equal mass of now heavily brecciated orthopyroxene-rich silicates. Other silicates (esp. olivine and plagioclase), troilite, chromite, and other minor constituents are found in Dong Ujimqin Qi (as in other mesosiderites). The Ca-poor, slitely variable pyroxene in Dong Ujimqin Qi is usually ~ 24 mol% ferrosilite; plagioclase appears to be mostly anorthite, and the olivine — often found in large crystals several cm in diameter — is unusually Mg-rich. Minor and even trace amounts of such minerals as merrillite, tridymite, and standfieldite is to be expected. The presence of cordierite is a little surprising as it is a metamorphic phase in terrestrial geological environments. Cordierite had, however, been found previously in the Chaunskij mesosiderite.

A number of active and still unresolved hypotheses are under discussion as to how the original mesosiderites were created on an ancient original parent body and/or during a collision between two asteroids. Much later, after presumably being separated from a mother asteroid or asteroidal fragment, Dong Ujimqin Qi experienced a relatively long cosmic exposure age of 250±50 Ma before it eventually collided with the earth.

Over 200 mesosiderites have been found, many of them small, weathered, and fragmented, in the cold and hot desserts of Antarctica, Australia, Africa, the Americas and elsewhere. A good number of them are moderately massive (28 with m> 10 kg by late 2014) and sometimes yield valuable info. However, the brecciated nature of the 'normal' mesosiderite makes them — and especially their sulfides and phosphides — particularly vulnerable to chemical attack in almost any terrestrial environment. Thus, Dong Ujimqin Qi, as the 2nd most massive mesosiderite fall and the 7th most massive mesosiderite overall, is a particularly valuable addition to the mesosiderite collection.

Regions containing this locality

Amur PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

8 valid minerals.

Meteorite/Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'Albite-Anorthite Series'
Formula: Ca(Al2Si2O8)
Formula: (Mg,Fe)2Al3(AlSi5O18)
'Fayalite-Forsterite Series'
Formula: Fe
Iron var: Kamacite
Formula: (Fe,Ni)
Formula: Ca9NaMg(PO4)7
'Pyroxene Group'
Formula: Ca4Mg5(PO4)6
Formula: (Fe,Ni)
Formula: SiO2
Formula: FeS

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
var: Kamacite1.AE.05(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
Group 4 - Oxides and Hydroxides
Group 8 - Phosphates, Arsenates and Vanadates
Group 9 - Silicates
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Pyroxene Group'-

List of minerals arranged by Dana 8th Edition classification

Metals, other than the Platinum Group
var: Kamacite,Ni)
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with Al substituted rings
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Pyroxene Group'-

List of minerals for each chemical element

O MerrilliteCa9NaMg(PO4)7
O Cordierite(Mg,Fe)2Al3(AlSi5O18)
O TridymiteSiO2
O StanfielditeCa4Mg5(PO4)6
O AnorthiteCa(Al2Si2O8)
Na MerrilliteCa9NaMg(PO4)7
Mg MerrilliteCa9NaMg(PO4)7
Mg Cordierite(Mg,Fe)2Al3(AlSi5O18)
Mg StanfielditeCa4Mg5(PO4)6
Al Cordierite(Mg,Fe)2Al3(AlSi5O18)
Al AnorthiteCa(Al2Si2O8)
Si Cordierite(Mg,Fe)2Al3(AlSi5O18)
Si TridymiteSiO2
Si AnorthiteCa(Al2Si2O8)
P MerrilliteCa9NaMg(PO4)7
P StanfielditeCa4Mg5(PO4)6
S TroiliteFeS
Ca MerrilliteCa9NaMg(PO4)7
Ca StanfielditeCa4Mg5(PO4)6
Ca AnorthiteCa(Al2Si2O8)
Fe Iron (var: Kamacite)(Fe,Ni)
Fe Cordierite(Mg,Fe)2Al3(AlSi5O18)
Fe Taenite(Fe,Ni)
Fe TroiliteFeS
Fe IronFe
Ni Iron (var: Kamacite)(Fe,Ni)
Ni Taenite(Fe,Ni)

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

0 - 66 Ma

ID: 3185574
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 66 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Grossman, J. N. [Ed.] (1997). The Meteoritical Bulletin, No. 81, 1997 July. Meteoritics & Planetary Science, 32, #4, Supplemental, A159-166. (July 1997).
Mittlefehldt, D. W., McCoy, T. J., Goodrich, C. A. & Kracher, A. (1998). Non-chondritic meteorites from asteroidal bodies. In: Planetary Materials (Papike, J. J. [Ed.]): Chapter 4, 195 pages. Mineralogical Society of America: Washington, DC, USA.
Grady, M. M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.
Terribilini, D., Eugster, O., Mittlefehldt, D, W., Diamond, L. W., Vogt, S. & Wang, D. (2000) Mineralogical and chemical composition and cosmic-ray exposure history of two mesosiderites and two iron meteorites: Meteoritics & Planetary Science 35 (3): 617-628 (May 2000)
Kong, P., Su, W., Li, X., Spettel, B., Palme, H. & Tao, K. (2008) Geochemistry and origin of metal, olivine clasts, and matrix in the Dong Ujimqin Qi mesosiderite: Meteoritics & Planetary Science 43(3): 451-460. (March 2008)

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