陶枣矿区太原组成煤植物群落及其意义

COAL-FORMING PLANT COMMUNITIES OF THE TAIYUAN FORMATION OF TAOZAO COALFIELD, SHANDONG PROVINCE, AND ITS SIGNIFICANCE

陶枣矿区太原组煤层中赋存大量黄铁质和钙质煤核，其植物组成包括高等植物科这类、石松类、辉木类、楔叶类等和低等生物藻类及菌类。由这些植物构成的太原组成煤植物群落在垂直结构上分为三个层次：第一层次为群落主要层，以科达类和鳞术类等高大乔木为主；第二层次是楔叶类为代表的林下植物；第三层次是水体中大量存在的藻类和菌类。植物群落的层次结构和生态环境与现代落羽杉森林沼泽相似。明显的菌藻类低等生物贡献是华北太原组成煤植物组成的一大特点，也是华北太原组煤和镜质组性质异常性的重要原因。

here are abundant pyritic and calcareous coal balls from coal seams of the Taiyuan Formation in Taozao coalfield. The flora in coal balls consist of vascular plants, including Cordaitales, Lepidodendrales,Sphenophyllales, Equisetales, Lycopodiales, Psaronius and Algae(maily Botrydeoccaceae),bacteria fossils.Paleobotanical and paleoecological analyses indicated that the coal --forming plant communities of the Taiyuan Formation could be devided into three levels in vertical structure: The first is main layer of communities represented by Cordatitales and Lepidodendrales forest; the second is subordinate layer of communities represented by Sphenophyllales etc. developed under forest tree, the third is abundant Algae and Bacteria lived in the swamp waters. The vertical level structure and ecololgical environment of the coal --forming plant communtities of the Taiyuan Formation are similar to modern tropical Taxodiaceae forest swamp, one distingushed characteristicsis is significant constribuation of Algae and Bacteria in the coal--forming plant communities of Taiyuan Formation in North China. This is also the important reason of anomalous properties of coal and vitrinite of the Taiyuan Formation.