关于中国的海相三叠系建阶及下三叠统分阶界线

国际地层委员会提出将在近年内完成各地质年代中阶间界线层型的选定工作.全国地层委员会也于第3届全国地层委员会上提出了中国各时代地层的建阶方案.因此, 以阶为实体的年代地层学研究已成为当前地层学研究的焦点.介绍了国际三叠系年代地层划分方案及确定过程, 并列述了中国海相三叠系建阶方案.重点讨论了中国海相下三叠统各阶顶、底界线及其确定标准和标志, 提出了中国下三叠统建阶工作研究重点 

Chinese Marine Triassic Stages and Boundaries of Lower Triassic Stages

The International Commission on Stratigraphy proposed that all stratotypes between the chronostratigraphic stages should be selected in the coming years. The China National Commission on Stratigraphy suggested a scheme of the Chinese chronostratigraphic stages of all the systems at the third National Stratigraphic Conference in 2000. Therefore, the stage based stratigraphic study is the focus of the current stratigraphic studies. This paper introduces both the scheme of the international Triassic chronostratigraphic division and the history of the scheme selection. The outline of the Chinese marine Triassic stages is stated as well in this paper, with an emphasis on the definition and recognizable markers of the top and basal boundaries of the Lower Triassic stages. The current key aspects in the study of the Chinese Lower Triassic stages are also suggested in this paper.