Geology of the Bayan Obo iron-rare-earth-niobium deposits, Inner Mongolia, China

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The plate tectonic setting, regional geology, and certain aspects of the economic geology of the iron-rare-earth-niobium ore bodies at Bayan Obo, Inner Mongolia, China, were studied by a team of geologists from the Tianjin Geologic Research Academy and the U.S. Geological Survey between 1987 and 1989. These ore bodies were formed by hydrothermal replacement of Middle Proterozoic dolomite in an intracontinental rift setting. A variety of veins and/or dikes that have a carbonatite-like mineralogy cut the footwall clastic rocks and migmatites. The hanging wall is a shale that has been converted to a K-metasomatite and has microcrystalline potassium feldspar as its principal constituent. This shale served as a scaling caprock that contained the chemical solutions that reacted with the dolomite and created the enormous concentration of mineralized rock in an 18-kilometer-long syncline. The rocks that host these ore bodies and the associated mineralized areas occur today as roof pendants in granitoid rocks of Permian age.

Additional publication details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Geology of the Bayan Obo iron-rare-earth-niobium deposits, Inner Mongolia, China
Year Published:
Publ by Soc of Mining Engineers of AIME
Publisher location:
Littleton, CO, United States
Larger Work Title:
Preprint - Society of Mining Engineers of AIME
Conference Title:
1991 SME Annual Meeting
Conference Location:
Denver, CO, USA
Conference Date:
25 February 1991 through 28 February 1991