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

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

Albite
'Allanite'
Arfvedsonite
Baryte
Bastnäsite-(Ce)
Calcite
Cebaite-(Ce)
Cordylite-(Ce)
Dolomite
Fluorapatite
Fluorite
Hematite
Huanghoite-(Ce)
Magnesio-riebeckite
Magnetite
'Monazite'
Parisite-(Ce)
Phlogopite
Quartz
Riebeckite


20 entries listed. 18 valid minerals.

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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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