论文部分内容阅读
运用因子分析法处理青藏高原东北边缘临夏盆地近３０ＭａＢ．Ｐ．以来新生代沉积物的氧化物含量提取的气候演变的序列及特征与孢粉分析结果基本一致，即在第三纪大部分时间中，虽有冷干与暖湿的交替变化，但气候状况相对稳定；进入上新世后，气候不稳定性显著增加，表现为冷干与暖湿大幅度、频繁地交替，至第四纪早期，才又表现出相对冷湿的环境特征．这一变化特征一定程度上反映了东亚季风由上新世前不显著至上新世中逐步建立，直至第四纪早期稳定建立的动态过程．气候自第三纪以来的重大调整，同青藏高原的阶段性隆升有密切关系．
Applying Factor Analysis to Treat Linxia Basin on the Northeast Margin of Qinghai - Tibet Plateau in Recent 30 Ma. P. Since Cenozoic sediments oxide content of the climate evolution sequence and characteristics of the sequence analysis and the results of sporopollen analysis are basically the same, that is, most of the Tertiary period, although the alternating cold and warm and humid changes, but the relative climate status After entering the Pliocene, climate instability increased significantly, showing the cold dry and warm wet substantial, frequent alternations, until the early Quaternary, only showed relatively cold and wet environment characteristics. To some extent, this change reflects the dynamic process of the East Asian monsoon, which was not established during the Pliocene before the Pliocene and was established steadily until the early Quaternary period. The major adjustment of climate since the Tertiary is closely related to the staged uplift of the Tibetan Plateau.