陆相二叠系-三叠系界线研究进展

着重介绍了几个目前陆相二叠系—三叠系界线（TPTB）研究的重点剖面及其生物地层学研究进展；分析了陆相二叠系—三叠系界线综合地层学研究现状，包括生物地层学、事件地层学、同位素年代学、磁性地层学和层序地层学等；剖析了陆相二叠系-三叠系界线地层学研究中存在的问题及进一步的研究方向。生物地层方面，陆相二叠系-三叠系界线附近存在晚二叠世与早三叠世生物混生的层位，其中不同类别生物的时间界线常不一致，又由于陆相界线地层中含脊椎动物化石的层位一般较少，以脊椎动物化石（Lystrosaurus）为标准的精确界线常不确定，因而需重新寻找并确定陆相三叠系底界的标准化石。事件地层标志可能会成为连结海、陆相二叠系-三叠系界线地层高精度对比的纽带。

Advance in the Study of Terrestrial Permian Triassic Boundary

This paper deals with the advance in the study of terrestrial Permian-Triassic boundary (TPTB) At first, some index TPTB sections and their research backgrounds are introduced Then, the research status on the synthesis of the TPTB, including biostratigraphy, eventostratigraphy, isotopic dating, magnetostratigraphy and sequence stratigraphy etc , is analyzed Finally, the existing problems and the next research directions about the TPTB study are assessed According to TPTB biostratigraphy, more and more evidence prove that, like the mixing fauna feature in marine Permian Triassic boundary strata, there also exist mixing fossils of Late Permian and Early Triassic in TPTB strata Among the mixing fossils, different sort of biota has different time limit Meanwhile, the TPTB beds with vertebrates are limited, so the definite boundary marked by vertebrate(Lystrosaurus)is usually uncertain As a result, it is needed to restudy and confirm the standard fossils for defining the terrestrial basal Triassic At the same time, the eventostratigraphic markers may become the tache for high resolution marine and nonmarine Permian Triassic boundary correlation