论文部分内容阅读
以位于沙漠黄土边界带的榆林、阿羌和米浪沟湾地层剖面为典型例证 ,讨论了 110 0kaBP以来中国沙漠沙尘暴的形成、发展和演化过程。提出在过去的 110 0ka中该区总共记录了 4 2个沙尘暴时期 ,并与 4 1个间沙尘暴时期构成比较连续且交替进行的一系列沉积演化历史。其中 ,最强烈的沙暴期发生时间大致在 6 2 0kaBP和 6 80kaBP前后 ,最温暖的间沙尘暴期出现在 5 90～ 5 0 0kaBP和15 0～ 70kaBP。研究认为 ,110 0kaBP以来因沙尘暴期与间沙尘暴期交替出现而形成的沉积旋回 ,是自那时以来在冰期、间冰期气候波动影响下冬夏古代季风相互对峙、交替演化形成气候旋回的结果
The formation, development and evolution of sandstorms in deserts of China since 110 0kaBP are discussed with the typical Yulin, Aqiang and Mielonggou stratigraphic sections located in the loess boundary of the desert. In the past 110 0 ka, a total of 42 sandstorms were recorded in this area, and a series of sedimentary evolutions that were continuous and alternated with 4 1 sandstorms were recorded. Among them, the strongest sandstorm occurred in about 6 2 0kaBP and 6 80kaBP before and after, the warmest sandstorm between 5 90 ~ 5000kaBP and 15 0 ~ 70kaBP. The study suggests that the sedimentary cycles formed since 110 0kaBP due to the alternation of dust storms and inter-dust storms are the result of the alternating climate of the ancient monsoons in winter and summer under the influence of the glacial and interglacial climatic fluctuations since then