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Dong Ujimqin Qi meteorite, East Ujimqin Banner (Dongwuzhumuqin Co.; Dongwu Qi), Xilin Gol League (Xilinguole Prefecture), Inner Mongolia Autonomous Region, China

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Latitude & Longitude (WGS84): 45° 30' 0'' North , 119° 1' 59'' East
Latitude & Longitude (decimal): 45.50000,119.03333
Non-native locality type:Meteorite
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
Name(s) in local language(s):, 锡林郭勒盟, 内蒙古自治区, 中国


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.


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References

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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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