事件性海侵与煤聚积规律——鲁西晚石炭世富煤单元的形成

EPISODIC TRANSGRESSIONS AND COAL ACCUMULATION: AN EXAMPLE FROM THE LATE CARBONIFEROUS COAL-RICH UNITS IN THE WESTERN SHANDONG COALFIELDS

关键词:  事件性海侵  富煤单元  石炭二叠系  鲁西煤田

Key words:  episodic transgression  coal-rich unit  Carboniferous-Permian  western Shandong coalfield

摘要:

华北晚古生代内陆表海大型聚煤盆地的极平坦的地势是煤聚积的良好场所,而事件性海侵为泥岩沼泽发育及泥炭迅速得以保存最终形成煤层提供了条件。研究表明,石炭二叠纪煤系中可识别出若干个重要的事件性海侵层,研究这些海侵层的形成,对探明富煤单元的分布具有重要的实际意义。本文讨论了事件性海侵与富煤单元形成及分布的成因联系,应用层序地层学理论和方法,分析了鲁西煤田煤聚积规律。

Abstract:

The extremely gentle slope of the large coal-accumulating basins in the Late Palaeozoic epicontinental seas in North China is believed to be good sites of coal accumulation. The episodic transgressions of sea water,in turn,have provided favourable conditions for the development of peat swamp and the preservation of peat. The results in this study show that many important episodic transgressive horizons may be recognized in the Carboniferous -Permian coal measures. The study of the formation of these transgressive horizons is advantageous to the exploration of the distribution of coal-rich units. In this paper, the authors discuss the genetic relationship between the episodic transgressions of sea water and the formation and distribution of coal-rich units,and the coal accumulation in the western Shandong coalfields with the aid of the theory and method of sequence stratigraphy.