柳区砾岩是在印度和欧亚板块碰撞之后伴随造山带的后期演化所形成的一套具有重要大地构造意义的山前磨拉石建造,它对确定印度/亚洲板块碰撞时间的上限、探讨青藏高原的隆升历史具有重要意义。作者等最近在野外考察过程中在该套磨拉石的上部层位再次找到了一批植物化石,经研究鉴定约有10余种,隶属7科9属。相比前人发现,这些植物化石多是新出现的科属种,而且大多数是已经灭绝的类型,与现生种的关系较远,因此它们的发现为西藏及喜马拉雅地区的古生物及古气候环境研究提供了重要信息,是对这一地区生物化石的重要增补。文中报道这些植物化石组合及其区系特征,探讨这些化石植物组合所反映的古气候条件,并对一些主要的植物化石特征进行了比较详细的描述。

The Liuqu Formaton, uncomformably overlying the Indus-Tsangpo ophiolite in the north and the passive continental sequence of the India Plate in the south, is composed of a set of thick red conglomerates interbedded with a small quantity of thin sandstones or mudstones. It was formed during the southward obduction of the ophiolite complexes onto the passive continental margin of India in Trans-Himalaya region after the collision between the two plates of the Indian and Eurasian, therefore, it is of great tectonic significance in determining the upper limited age of the collision time of India plate with the southern margin of Eurasia and in discussing the uplifting histories of the Tibet Plateau. However, the age of this molasses remains in great disputes because of the lack of biostratigraphic evidence for a long time.

P534.53 P588.212.5

国家重点基础研究发展规划项目(No.2002CB412600)，中国科学院资源环境领域知识创新工程重要方向项目(No.KZCX2SW119)资助课题。