摘要
分布在川西高原海拔 4 10 0m的章德第四纪复式沉积盆地 ,表部覆盖着Ⅰ—Ⅲ级河谷阶地沉积 ,其中含大量的植物孢粉化石。Ⅲ级阶地内植物孢粉组合为早中全新世温暖潮湿气候下形成 ;Ⅱ—Ⅰ级阶地的植物孢粉组合为晚全新世较干冷气候的森林草原环境形成。下伏的措普寺冰碛层为晚更新世第五冰期沉积。
Zhangde basin is a Quaternary composite sedimentary basin with an elevation of 4100 m in west Sichuan. Terrace deposits in the basin contain a great amount of sporomorphs. Sporopollen assemblage in deposits on the terrace Ⅲ was formed under conditions of a temperature and moist climate in the Early and Middle Holocene, while sporopollen assemblage in deposits on the terraces Ⅱand Ⅰ was formed in forest and grasslands under conditions of a dry and cold climate in the Late Holocene. The underlying Cuopusi drift sheet was deposited in glacial epoch Ⅴ in the Late Pleistocene. These are references for stratigraphic correlation in the Quaternary basins on the West Sichuan Plateau.
出处
《四川地质学报》
2004年第2期69-72,共4页
Acta Geologica Sichuan
关键词
沉积盆地
全新世
高原抬升
孢粉组合
Holocene
temperature-tropic sporopollen assemblage
dry and cold sporopollen assemblage
plateau uplift
