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Wu dyke, Dulahala, Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia Autonomous Region, China

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A carbonatite dyke, emplaced along a fault that separates coarse quartz sandstone from shale, both members of the Middle Proterozoic Bayan Obo Group. The dyke, which was named for its discoverer, is well exposed over a length of 60 m. It is 1.1-1.5 m wide, strikes NE and dips NW at an angle of about 85°. The wall rocks on both sides are fenitized to a width of 10-20 cm and this alkaline mineralization extends along fractures and joints into the adjacent sandstone, for up to 30 m away from the contact zone. The dyke was affected by later tectonism and is strongly deformed and sheared sub-parallel to the dyke walls.

Located at Dulahala, about 2 km NNE of the East ore body.

Mineral List



20 entries listed. 18 valid minerals.

The above list 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 visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Yang, X.M., Yang, X.Y., Zheng, Y.F., and Le Bas, M.J. (2003): A rare earth element-rich carbonatite dyke at Bayan Obo, Inner Mongolia, North China. Mineralogy and Petrology 78, 93-110.

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