Xi Ujimgin meteorite, West Ujimqin Banner (Xiwuzhumuqin Co.), Xilin Gol League (Xilinguole Prefecture), Inner Mongolia Autonomous Region, China
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| Latitude & Longitude (WGS84): | 44° 40' North , 117° 30' East |
|---|---|
| Latitude & Longitude (decimal): | 44.66667,117.50000 |
| Non-native locality type: | Meteorite |
| Meteorite Class: | L/LL6-an chondrite meteorite |
| Meteoritical Society Class: | L/LL6-an |
| Metbull: | View entry in Meteoritical Bulletin Database |
| Köppen climate type: | Dwb : Monsoon-influenced warm-summer humid continental climate |
| Name(s) in local language(s): | , 内蒙古自治区, 中国 |
Ordinary chondrite, (L/LL6-an; S2)
Fall, 24 August 1980, 17 hrs; 5.9 kg
A single mass was recovered after an afternoon fall. Inspections revealed a largely equilibrated ordinary chondrite. Total iron (23.53 wt%) is consistent with an L-chondrite classification. Olivine (Fa~26.1) composition is very near the boundary of L and LL chondrite composition. A few mineralogical phases are referenced below, but petrographic studies in more accessible literature have been limited in scope. Instead, research citations have centered on Xi Ujimgin's ambiguous chemical signatures [e.g., high cobalt in matrix kamacite]. The somewhat arbitrary nature of the compositional 'borders' between L and L chondrites and the lack of other consistent indicators of Xi Ujimgin's relationship to either the L or LL group of ordinary chondrites has eventually resulted in its current classification as a rare L/LL ordinary chondrite.
A U,Th-He age of 4.45 Ga as well as a relatively high cosmic ray exposure (CRE) age of ~51 Ma have been reported.
Xi Ujimgin is the only meteorite currently classified as an 'anomalous' L/LL6-an chondrite as of early 2017 and one of only 11 witnessed L/LL falls. The main mass has been at the Beijing Planetarium with a much smaller mass (117 g) at UCLA.
Mineral List
2 valid minerals.
Meteorite/Rock Types Recorded
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Alphabetical List Tree DiagramThis page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
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References
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Kallemeyn, G.W. & Wasson, J.T. (1984) Compositional-Petrographic Study of Ordinary Chondrites (Abstract): Lunar and Planetary Science XV: 425-426. (March 1984).
Kallemeyn, G.W., Rubin, A.E., Wang, D. & Wasson, J. T. (1989) Ordinary chondrites: Bulk compositions, classification, lithophile-element fractionations, and composition-petrographic type relationships. Geochim. Cosmochim. Acta, 53, 2747–2767.
Rubin, A. (1990) Olivine & Kamacite in Ordinary Chondrites: Intergroup and Intragroup relationships. Geochimica et Cosmochimica Acta 54: 1217-1230. (May 1990).
Wasson, J. T. & Wang, S. (1991) The histories of ordinary chondrite parent bodies - U, Th-He age distributions: Meteoritics 26(2):161-167. (June 1991).
Grady, M.M (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
Rubin, A.E. (2004) Shock Annealing and postannealing shock in equilibrated ordinary chondrites: implications for the thermal and shock histories of chondritic asteroids. Geochimica et Cosmochimica Acta 68 (3): 673-689.
External Links
http://www.lpi.usra.edu/meteor/metbull.php?code=24345 -Xi Ujimgin@MetBullDatabase
http://articles.adsabs.harvard.edu/full/1984LPI....15..425K -Kallemeyn & Wasson (1984).
http://articles.adsabs.harvard.edu/full/1984LPI....15..425K -Kallemeyn & Wasson (1984).
