کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8123363 1522510 2018 59 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rare earth minerals in a “no tonstein” section of the Dean (Fire Clay) coal, Knox County, Kentucky
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
پیش نمایش صفحه اول مقاله
Rare earth minerals in a “no tonstein” section of the Dean (Fire Clay) coal, Knox County, Kentucky
چکیده انگلیسی
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, LaCeNdTh monazite, barium niobate, native gold, and FeNiCr 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Coal Geology - Volume 193, 1 June 2018, Pages 73-86
نویسندگان
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