Węgiel kulisty z Kaczyc (Rybnicki Okręg Węglowy)
Abstract
BALL COAL FROM KACZYCE (RYBNIK COAL REGION)
Summary
The borehole Kaczyce-23 bis encountered a layer of natural coke at the depth 1410.10-1414.50 m. The coke layer is cut by an intrusion of alterated andesite and its top part is formed by a coal seam yielding spherical forms known in the literature as ball coals. Spherical and ellipsoidal coal forms range from 1.5 to 4.0 cm in size. Microscopic studies showed that the spherical forms are similar in composition to coal in which they occur. The major microlithotypes building the spherical forms include vitrite and vitrinertite. Reflectance established on the basis of kaolinite grains equals 1.40%. On the basis of preliminary results of studies on ball coals from Kaczyce it may be stated that thermal effect of intrusion of igneous rocks is the factor most important for origin of coals of that type.
Summary
The borehole Kaczyce-23 bis encountered a layer of natural coke at the depth 1410.10-1414.50 m. The coke layer is cut by an intrusion of alterated andesite and its top part is formed by a coal seam yielding spherical forms known in the literature as ball coals. Spherical and ellipsoidal coal forms range from 1.5 to 4.0 cm in size. Microscopic studies showed that the spherical forms are similar in composition to coal in which they occur. The major microlithotypes building the spherical forms include vitrite and vitrinertite. Reflectance established on the basis of kaolinite grains equals 1.40%. On the basis of preliminary results of studies on ball coals from Kaczyce it may be stated that thermal effect of intrusion of igneous rocks is the factor most important for origin of coals of that type.