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 meteorite||Meteorite Fall Location|
|East Ujimqin Banner (Dongwuzhumuqin Co.; Dongwu Qi)||- not defined -|
|Xilin Gol League (Xilinguole Prefecture)||- not defined -|
|Inner Mongolia||Autonomous Region|
|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|
|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|
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 Plate||Tectonic Plate|
Select Mineral List TypeStandard Detailed Strunz Dana Chemical Elements
8 valid minerals.
Meteorite/Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
Detailed Mineral List:
|ⓘ 'Albite-Anorthite Series'|
|ⓘ 'Fayalite-Forsterite Series'|
|ⓘ Iron var: Kamacite|
|ⓘ 'Pyroxene Group'|
List of minerals arranged by Strunz 10th Edition classification
|Group 1 - Elements|
|Group 2 - Sulphides and Sulfosalts|
|Group 4 - Oxides and Hydroxides|
|Group 8 - Phosphates, Arsenates and Vanadates|
|Group 9 - Silicates|
|Unclassified Minerals, Rocks, etc.|
List of minerals arranged by Dana 8th Edition classification
|Group 1 - NATIVE ELEMENTS AND ALLOYS|
|Metals, other than the Platinum Group|
|Group 2 - SULFIDES|
|AmXp, with m:p = 1:1|
|Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES|
|Group 61 - CYCLOSILICATES Six-Membered Rings|
|Six-Membered Rings with Al substituted rings|
|Group 75 - TECTOSILICATES Si Tetrahedral Frameworks|
|Si Tetrahedral Frameworks - SiO2 with  coordinated Si|
|Unclassified Minerals, Mixtures, etc.|
List of minerals for each chemical element
|Fe||ⓘ Iron (var: Kamacite)||(Fe,Ni)|
|Ni||ⓘ Iron (var: Kamacite)||(Fe,Ni)|
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
|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.