豫西南区晚白垩世古气候的初步研究

豫西南区分布的一系列拉分槽盆内,沉积了一套以红色碎屑为主的砂、砾、泥与灰质混杂的上白垩统地层,时代相当于赛诺曼期-马斯特里赫特期。综合区内沉积学、岩石矿物学、古生物学等古气候标志性特征,认为该区属于亚热带-热带干旱-半干旱气候区,是我国华南亚热带-热带古气候的重要组成部分,这一研究结果,对于揭示恐龙的古生态特征、绝灭问题及秦岭造山带后造山阶段与古地理环境等具有十分重要的意义。

LATE CRETACEOUS PALAEOCLIMATES IN SOUTHWESTERN HENAN

A series of Upper Cretaceous strata consisting dominantly of red clastic sediments mixed with sand gravel,mud and lime mud was laid down within the Late Cretaceous pull apart basins in Southwestern Henan.These strata may be traced back to the Cenomanian Maestrichtian in age.The integration of sedimentological,petrographic,mineralogical and palaeontological data indicates that the palaeoclimates in the study area should be assigned to the semiarid to arid climates in the subtropical to tropical zones in South China, and may be of great importance for the studies of palaeoecological characteristics and extinction of dinosaurs, and for palaeogeographic reconstruction of the Qinling orogenic belt during post orogenic stages.