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PETROGRAPHIC AND MINERALOGICAL STUDY OF THE UNDERCLAYS OF ILLINOIS COAL *
Author(s) -
Allen Victor T.
Publication year - 1932
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1932.tb13891.x
Subject(s) - petrography , muscovite , pennsylvanian , geology , quartz , weathering , geochemistry , potash , deposition (geology) , mineralogy , mineral , clay minerals , potassium , metallurgy , materials science , geomorphology , paleontology , sediment , structural basin
A study was made of the petrographical and mineralogical characteristics of Illinois underclays, which were found to be mainly potash beidellite purified before deposition under the conditions of the Pennsylvanian period. Feldspars, muscovite, quartz, and other minerals were mixed with the clay minerals during deposition in water, but later the carbonates were removed. The weathering profiles developed on the underclays resemble the Wisconsin till.