Rare earth minerals in a 'no tonstein' section of the Dean (Fire Clay) coal, Knox County, Kentucky
| Autor: | James C. Hower, Michael F. Hochella, Sarah M. Mardon, Debora Berti |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
inorganic chemicals
020209 energy Stratigraphy Geochemistry Tonstein 02 engineering and technology 010502 geochemistry & geophysics complex mixtures 01 natural sciences otorhinolaryngologic diseases 0202 electrical engineering electronic engineering information engineering Kaolinite Coal Fire clay 0105 earth and related environmental sciences business.industry technology industry and agriculture Geology respiratory system Volcanic glass Diagenesis Fuel Technology Monazite Economic Geology business Volcanic ash |
| Zdroj: | International Journal of Coal Geology. 193:73-86 |
| ISSN: | 0166-5162 |
| Popis: | The Dean (Fire Clay) coal in Knox County, Kentucky, does not contain the megascopically-visible ash-fall tonstein present in most other sections of the coal bed. Like the Fire Clay tonstein, a low-ash portion of the coal is enriched in rare earth elements (>2400 ppm, on ash basis). In addition to kaolinite produced in the diagenesis of volcanic glass, transmission electron microscopy studies indicate the coal contains primary kaolinite, La Ce Nd Th monazite, barium niobate, native gold, and Fe Ni Cr spinels. The mineral assemblages, particularly the kaolinite-monazite association and its similarity to the tonsteins in coal to the east, demonstrate the coal was subject to the REE-enriched volcanic ash fall, apparently just at a more dilute level than at locations where the tonstein is present. |
| Databáze: | OpenAIRE |
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