Temporal and Spatial Variations of the Loess Accumulation Rate and Its Significance on the Loess Plateau During Quaternary
-
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。Abstract: The loess accumulation rates of Liujiapo, Luochuan，Xifeng,Baoji,Jiuzhoutai and Dadunling sections onthe 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 thesame fashion,besides the variation from glacial to interglacial epoches. There were several periods of extremelyhigh rates of the loess accumulation during Quaternary，which are coincided with the uplift events of theQinghai一Tibetan Plateau. At about 0. 7 MaBP，the winter monsoon had a remarkable change both in winddirection and intensity. Since then，the intensity of winter monsoon has become stronger and stronger,whilethe direction of winter monsoon has changed to northwest. This paper proved that the loess accumulation ratecan beconsidered as one of the best indices to indicate the winter monsoon variations of the Loess Plateau.
-
Key words:
- loess /
- accumulation rate /
- time sequence
-
[1] 1 安芷生，Porter S C.Chappell J等·最近130Ka洛川黄土堆积序 列与格陵兰冰芯记录·科学通报，1994,39(24):2254 - 2256
2 陈发虎，张维信等·甘青地区的黄土地层学与第四纪冰川同题· 北京:科学出版社，1993. 9-'47
3 刘秀铭·甘肃西峰黄土磁性地层与磁化率各向异性研究·硕士 论文，1986
4 Iukla G, An Zhisheng. Loess stratigraphy on central China. Palaeogcography, Palaeoclimatology, Palaeoecology ,1989 , 72: 203 - 225
5 李吉均，方小敏，马海洲等.晚新生代黄河上游地貌演化与青藏高 原隆起·中国科学，1996,26(40 311 - 322
6 刘东生等著·黄土与环境·北京:科学出版社，1985. 44-81, 332 -336
7 刘嘉麒，陈铁梅，聂高众等.渭南黄土剖面报道年龄测定及十五 万年来高分辩时间序列的建立·第四纪研究，1994, (3):193- 202
8 马海洲.柴达木盆地徨水谷地沙漠黄土河湖阶地研究.博士论 文，1996
9 Skackleton N J,et al. Accumulation Rate of Liess in Tadjikistan and China, Relationship with Global Ice Volume Cycles. Quaternary Proceedings. 1995 , (4) :1 - 6
10 播保田，李吉均，陈发虎·青藏高原:全球气候变化的驱动机与 放大器(I).兰州大学学报(自然科学版),1995,32(1):120- 128
11 施雅风，郑本兴，李世杰等.青藏高原东部最大冰期时代、高度 与气候环境探讨.冰川冻土，1995,17(20 97一112
12 郑洪波.白鹿源黄土磁性地学与最近80000。年古气候历史研 究·硕士论文，1989
13 孙建中，赵景波，孙秀英等·黄土，还要更老些·海洋地质与第 四纪地质，1987,7(1):106-'112
14 孙继敏，丁仲礼，刘东生等.黄土与古土壤磁组构测定在建冬季 风风向上的初步应用.科学通报，1995,40(21):1976-1987
15 朱照宇，丁仲礼等著.中国黄土高原第四纪古气候与新构造演 化·北京:地质出版社，1994.18-46 -
点击查看大图
计量
- 文章访问数: 1046
- HTML全文浏览量: 136
- PDF下载量: 510
- 被引次数: 0
下载:
