藏南昂仁县贡久布地区晚二叠世孢粉组合的特征及其意义

Characteristics and significance of the Late Permian sporopollen assemblage in the Gongjiubu area, Ngamring, southern Tibet, China.

贡久布一带的敌布错组分布于隆格尔-南木林地层分区,含较丰富的孢子花粉化石,以华夏植物群孢子花粉为特征,同时采获大量的植物化石,其时代为晚二叠世早期。根据地层中孢子花粉的演化规律,可建立Vetreisporitessignatus-Limitisporitesrectus孢子花粉组合带。丰富了古生物学的研究内容,为研究该区晚二叠世的沉积环境、古生态、生物古地理分区和地质演化历史提供了基础资料。结合区域资料分析,认为植物组合由冈瓦纳植物群与华夏植物群混生到典型华夏植物群是逐渐演化的。

The Dibuco Formation in the Gongjiubu area is distributed in the Lunggar-Namling stratigraphic subregion. It contains abundant sporopollen, which is characterized by sporopollen of the Cathaysia flora and a plenty of plant fossils. They are early Late Permian in age. The sporopollen Vetreisporites signatus-Limitisporites rectus assemblage may be established on the basis of the characteristics of the sporopollen evolution, which enriches the content of paleontological research and provides fundamental data for the study of the Late Permian sedimentary environment, paleoecology, biogeographic provinces and geological evolutionaryhistory. According to these data, combined with regional geological data, it is thought that the sporopollen assemblage has undergone a gradual evolutionary process from the mixture of the Gondwana flora and Cathaysia flora to the typical Cathaysia.