论文部分内容阅读
应用柴达盆地西部大浪滩梁ZK02孔岩芯,依据铀系年龄数据,选择130 ka BP(90.5 m以上)的含石膏粉砂淤泥层中34个样品进行孢粉分析研究,依据其孢粉组合特征,将该孔深90.5m以浅的孢粉百分比图式从下至上划分6个区域性孢粉带,进而分析了该区末次间冰期(130 ka BP)以来的古植被状况,结果表明,山地主要由松、云杉、冷杉等组成的寒温性针叶林覆盖,而盆地则主要是以蒿、菊、禾本科等中旱生草本植物组成的温性草原,总体上反映了该区130 ka以来代表冷干气候的5次成盐期及其所夹的6次温湿期变化韵律,由此可以推测,该区主要植被和古环境的进程很可能源于东亚夏季风的减弱或增强,其气候旋廻大致可以和青海湖QH-86孢粉分析所揭示的130 ka以来古植被演替及深海氧同位素第三阶段乃至黄土磁化率所反映的6个夏季风增强的时段进行对比。
Based on the uranium age data, 34 samples from the gypsum silt silt layer with the age of 130 ka BP (90.5 m) were selected for spore-pollen analysis based on the sporopollen assemblage The regional pattern of paleopia was analyzed from the bottom to the top of the paleo-sporopollen pattern with a depth of 90.5 m. The results showed that the mountainous area It is mainly covered by cold-temperate coniferous forest composed of pine, spruce and fir, while the basin is mainly composed of temperate steppe composed of mid-xerophytic herbs such as Artemisia, chrysanthemum, gramineae and so on, generally reflecting the region 130 Since ka represents the five salinization periods of cold and dry climates and the six rhythms of clinging to the warm and wet periods, it can be inferred that the process of the main vegetation and paleoenvironment in this area is likely to be caused by the weakening or strengthening of the East Asian summer monsoon , The climatic rotation can be roughly compared with the six summer monsoon periods reflected by the succession of paleoclimate since 130 ka and the third phase of deep-sea oxygen isotope and even the susceptibility of loess revealed by Qinghai Lake QH-86 sporopollen analysis.