| Abstract: | 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. |
| Genre: | Conference Paper |
| ProdID: | 70016851 |
| Citation Author: | Drew, L. J.; Qingrun, M.; Weijun, S. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | Anon |
| Citation End Page: | |
| Citation Issue: | |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Preprint - Society of Mining Engineers of AIME |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 14 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | Publ by Soc of Mining Engineers of AIME |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Geology of the Bayan Obo iron-rare-earth-niobium deposits, Inner Mongolia, China; 1991; Conference Paper; Preprint - Society of Mining Engineers of AIME; Drew, L. J.; Qingrun, M.; Weijun, S. |
| Citation Start Page: | |
| Citation Volume: | |
| Citation Year: | 1991 |
| Type: | citation/reference |
| Text: | Geology of the Bayan Obo iron-rare-earth-niobium deposits, Inner Mongolia, China; 1991; Conference Paper; Preprint - Society of Mining Engineers of AIME; Drew, L. J.; Qingrun, M.; Weijun, S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1991 00:00 -0600 |
| Publisher: | Publ by Soc of Mining Engineers of AIME |
