鲁西陆表海盆地高分辨率层序划分与海侵过程成煤特点  

The Division of High-resolution Sequences and the Transgressive Coal Formation in the Epicontinental Basin of the Western Shandong Province

作　　者：李增学[1] 魏久传[1] 韩美莲[1] 

机构地区：[1]山东科技大学地球信息科学与工程学院,山东泰安271019

出　　处：《沉积学报》2000年第3期362-368,共7页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目!(批准号 :49872 0 57)资助

摘　　要：晚石炭世至早二叠世华北陆表海盆地的高频海平面变化 ,是盆地充填和聚煤作用的主要控制因素 ,因而形成了旋回结构十分清楚的含煤层序。本文运用高分辨率层序地层学的思路、分析技术 ,研究了鲁西陆表海盆地含煤地层的高分辨率层序地层学特征 ,识别和划分了中长期和中、短期基准面旋回。研究表明 ,突发性的海侵事件对陆表海盆地聚煤作用具有重要影响 ,海侵过程成煤为鲁西煤聚积的显著特点。The high-frequency sea level changes in the North China epicontinental basin from the Late Carboniferous to Early Permian are the main factors controlling the basin-filling and coal accumulation. The coal-bearing succession, therefore, has distinct cycles. The sea level changes in the North China epicontinental basin were composite sea level changes. The long-term sea level changes are superposed by shorter-term cycles, the mid-term and short-term sea level changes. There were short-term retrogressive events in the process of long term transgressive period, and multiple short periodic transgressive events superposed on the long-term transgressive period. Study shows that the base-level cycles in the North China epicontinental basin may be substitute by the relative sea level cycles, because the high-frequency sea level changes in the basin are the integrative results of the sea level changes, the tectonic subsidence, the climate changes and the sediment supply. The later three factors, the tectonics, the climate and the sediment supply were relatively stable. The sea level changes, thus, become the dominant factor. Using the thought and methodology of high-resolution sequence stratigraphy, the authors investigate the characteristics of the high-resolution sequence stratigraphy of the coal measures in the Western Shandong, identify and divide the mid-long term and mid-short term base-level cycles. Three long-term base-level changes lead to the formation of three third order sequences. The mid-term base-level cycles are approximately corresponded to the systems tracts. Large-scale marine flooding events were caused by the mid-term base-level rise. Because of the hysteresis of the deposition, the thick-bedded limestones were deposited in the period of maximum base-level rises, which occurred three times in the history of the epicontinental basin, representing the depositions of three times of maximum base-level rises. The outstanding feature of the paralic succession is the alternative occurrences of the marine an

关 键 词：高分辨率层序 海侵过程成煤 基准面旋回 

分 类 号：P539.2[天文地球—古生物学与地层学] P618.110.2[天文地球—地质学]