화학공학소재연구정보센터
International Journal of Coal Geology, Vol.28, No.2, 229-248, 1995
Palaeohistological studies on miocene brown coals of Central Europe
The texture of peat-forming plants is often excellently preserved in the Miocene seam layers of the Central European Depression. As the micropetrographic categories 'maceral' and 'microlithotype' are primarily based only on the optical properties and degree of coalification of the cell wall, the additional consideration of histological characteristics is expected to bring about a considerable gain in knowledge regarding the petrographic description and facies interpretation of seam layers. In the micropetrographic characterisation of some brown coal seams in Germany, the microlithotype group 'textite' was used for textural descriptions. The microlithotypes included in textite are defined by histological features and are comparable to phyterals. The microlithotypes are: (1) xylo-textite: tissue with histological characteristics of wood, (2) marcoduria-textite: tissue of primary roots of conifer, (3) peridermo-textite: cork tissue and bark parenchyme, (4) phyllo-textite: leaf tissue, in particular of conifers. The various microlithotype proportions were determined by point counting. A micropetrographic identification of the types of facies in the 2nd Lusatian seam horizon was successful. The facies types show a vertical, recurrent succession. The distribution of histological microlithotypes in seam profiles reveals asymmetric changes in contents of peridermo-textite and marcoduria-textite, which correspond to facies successions. The micropetrographic composition of facies successions both in the 2nd Lusatian seam horizon and in the 'Frimmersdorf seam of Lower Rhenish Basin is similar.