摘要
在分析总结前人研究成果的基础上，通过岩心观察、岩石学特征分析及地球化学参数研究，在鄂尔多斯盆地东南部二叠系山西组底部发现了代表海相或海陆过渡相的沉积特征，即高成分成熟度和高结构成熟度的石英砂岩、地球化学标志、沉积构造标志及铝土质泥岩。上述海相环境标志的存在，充分说明鄂尔多斯盆地东南部山西组沉积早期为海陆过渡沉积环境。在此认识的基础上讨论了山西组早期沉积环境的时空演化特征。
On the basis of the predecessors＂ research fruits, through the core observation, petrologic analysis and geochemical parameter studies, sedimentary characteristics of typical marine or transition facies have been found in the bottom of the Shanxi Formation of the southeastern Ordos basin, namely quartzose sandstone with high compositional maturity and the structural maturity, geochemical mark, sedimentary structure mark and bauxitie mudstone. The existence of the marine facies environment marks fully demonstrated that the Shanxi Formation of southeast Ordos basin in early stage was transitional deposition environment. On the basis of this understanding, space-time evolution characteristics of depositional environment of early Shanxi Formation are discussed.
