黄土高原第四纪粉尘沉积速率的时空变化及其意义  

Temporal and Spatial Variations of the Loess Accumulation Rate and Its Significance on the Loess Plateau During Quaternary

作　　者：吴海斌[1] 陈发虎[1] 王建民[1] 

机构地区：[1]兰州大学地理科学系,兰州730000

出　　处：《沉积学报》1998年第1期147-151,共5页Acta Sedimentologica Sinica

基　　金：国家自然科学基金!49571065;国家教委跨世纪优秀人才基金

摘　　要：本文系统地计算了黄土高原洛川、西峰、宝鸡、西安刘家坡、兰州九洲台、西宁大墩岭黄土剖面的粉尘沉积速率，发现粉尘沉积速率除随冰期、间冰期具有明显波动外，还呈现时间上由老向新的阶段性升高，空间上由西北向东南降低的总体趋势。第四纪以来，黄土高原粉尘沉积速率出现了几次异常增高的时期，它们与青藏高原隆起时段相吻合。距今约70万年，该区冬季风出现重大调整，冬季风风力明显的逐步增强，风向偏转到NW方向。粉尘沉积速率可作为我国冬季风强弱变化的较好指标。The loess accumulation rates of Liujiapo, Luochuan, Xifeng, Baoji, Jiuzhoutai and Dadunling sections on the loess plateau were systematically studied in this paper. It was found that the loess accumulation rates have increased step by step from past to present,and decreased from NW to SE in the same fashion, besides,the variation from glacial to interglacial epoches. There were several periods of extremely high rates of the loess accumulation during Quaternary, which are coincided with the uplift events of the Qinghai-Tibetan Plateau. At about 0. 7 MaBP,the winter monsoon had a remarkable change both in wind direction and intensity. Since then,the intensity of winter monsoon has become stronger and stronger,while the direction of winter monsoon has changed to northwest. This paper proved that the loess accumulation rate can be considered as one of the best indices to indicate the winter monsoon variations of the Loess Plateau.

关 键 词：粉尘沉积速率 时间序列 第四纪 黄土高原 

分 类 号：P512.2[天文地球—地质学] P534.63