| Autor: |
Murphy, Edward C., Moxness, Levi D., Kruger, Ned W., Maike, Christopher A. |
| Předmět: |
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| Zdroj: |
Report of Investigation - North Dakota Geological Survey; 2018, Vol. 119, preceding pi-46, 50p |
| Abstrakt: |
Twenty geologic sections were measured along the steep cliff faces near Tepee Buttes on Logging Camp Ranch in Slope County, North Dakota. A total of 113 samples were collected and analyzed for rare earth element concentrations. The majority of these samples were lignite coming from the Harmon, Hanson, and H beds in the Bullion Creek Formation of the Fort Union Group (Paleocene). Samples were collected from three main areas, 94 samples came from the measured sections north of the Little Missouri River and 19 samples were obtained from two localities on the south side of the river first reported by Kruger and others (2017). Rare earth concentrations at the top of the Harmon bed averaged 112 ppm on the north side of the river, but averaged 314 ppm on a whole rock basis in section 7 on the south side of the river. Samples from the top of the H bed, two on the north side of the river and one on the south side had rare earth element whole rock analysis of 171, 638, and 1,026 ppm. The rare earth element concentrations of 638 and 1,026 ppm are the highest values yet reported from North Dakota lignite. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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