摘要
通过测制西藏拉萨桑达乡第四系剖面,系统采集并分析了植硅体样品,根据植硅体的形态分类及组合、温暖指数等特征,划分为5个植硅体组合带:组合带Ⅰ为齿型—平滑棒型、石屑型、网脊块状,反映气温温凉;组合带Ⅱ为长方型—平滑棒型、多面体型,显示气候转暖;组合带Ⅲ为长方型、齿型—平滑棒型组合带,显示气候干旱的特点;组合带Ⅳ为长方型—亚铃型、齿型—平滑棒型、多面体型组合带,反映此时气候温暖潮湿;组合带Ⅴ为齿型、帽型—平滑棒型、多面体型、石屑组合带,显示气候寒冷的特点。最后在总结分析该区植硅体特征的基础上,对拉萨桑达地区第四纪古植被、古环境进行了探讨。
Through systematic analysis of phytolith characteristics on the Quaternary section at Sangda Village in Lhasa ,Tibet , such as morphological classification, combination character, warmth index, five assemblage zones can be distinguished as follows ： the first combination of tooth model-smooth bar model , chip model , muri block, reflecting a warm-cool climate; the second , rectangular model-smooth bar model and polyhedron model, reflecting the warmer climate; the third, rectangular model, tooth model-smooth and bar model , reflecting a drought climate; the fourth, rectangular model-dumbbell model, tooth model-smooth bar model and polyhedron model , indicating warm and damp climate; and the fifth, tooth model, cap model-smooth bar model, polyhedron model and chip mode, indicating a colder climate. The study of morphological classification and combination could be applied for probing into palaeoenvironment and paleo-vegetations of Quaternary in the Sangda village, Lhasa area.
出处
《沉积学报》
CAS
CSCD
北大核心
2008年第3期479-486,共8页
Acta Sedimentologica Sinica
关键词
西藏拉萨
植硅体
组合带
古环境
Lhasa, Tibet, phytolith assemblage zone, palaeoenvironment
