East Mine, Bayan Obo deposit (Bayun-Obo deposit; Baiyunebo deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia Autonomous Region, China
|Latitude & Longitude (WGS84):||41° 48' 4'' North , 109° 58' 54'' East|
|Latitude & Longitude (decimal):||41.8011111111, 109.981666667|
Late Palaeozoic granitoids are distributed in a large area southeast of the east open pit mine. They intruded directly into the ore-bearing dolomite and produced intense skarnization. Skarnized rocks were first encountered in a drill core in the south part of the mine.
48 valid minerals. 6 (TL) - type locality of valid minerals.
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
252.17 - 541 Ma
|Paleozoic intrusive and metamorphic terranes|
Age: Paleozoic (252.17 - 541 Ma)
Comments: Mixtures of metamorphic and intrusive or plutonic rocks, tracts known as crystalline, migmatitic terranes, moderately to highly metamorphosed rocks of unknown origin with or without intrusions. This classification is inherently prone to variable interpretation, as other compilers might distinguish some packages by their metamorphic or gneissic protoliths, and the associated age ranges may be more variable.
Lithology: Intrusive and metamorphic terranes
Reference: Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d. 
Kuifeng Yang, Hongrui Fan, Fangfang Hu, Xianghui Li, Jianyong Liu, Yonggang Zhao, Shuang Liu, and Kaiyi Wang (2007): Skarnization age in the giant Bayan Obo REE-Nb-Fe ore district, Inner Mongolia, China: Rb-Sr isochrone dating on single-grain phlogopite. Acta Petrologica Sinica 23(5), 1018-1022 (in Chinese with English abstract).