殷志强^1,,
魏刚^2,,,
秦小光³,
赵无忌⁴
1. 中国地质环境监测院, 北京 100081
2. 青海九○六工程勘察设计院, 青海 西宁 810007
3. 中国科学院地质与地球物理研究所, 中国科学院新生代地质与环境重点实验室, 北京 100029
4. 滨州学院建筑工程系, 山东 滨州 256600

基金项目: 青海省科技计划项目（批准号：2018-ZJ-714）和国家自然科学基金项目（批准号：41372333）共同资助


详细信息

作者简介: 殷志强, 男, 39岁, 高级工程师, 从事第四纪环境演变与滑坡研究, E-mail:yinzq@cigem.cn

通讯作者: 魏刚, E-mail:158213989@qq.com

中图分类号: P941.78;P534.63⁺2

收稿日期:2019-05-11
修回日期:2019-07-16
刊出日期:2019-09-30

Study on the loess records of the climate change since 26 ka B.P. from Xunhua to Guanting basin in the northeastern boundary of the Tibetan Plateau

Yin Zhiqiang^1,,
Wei Gang^2,,,
Qin Xiaoguang³,
Zhao Wuji⁴
1. China Institute of Geo-Environment Monitoring, Beijing 100081
2. Qinghai 906 Engineering Survey and Design Institute, Xining 810007, Qinghai
3. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029
4. Department of Architectural Engineering, Binzhou University, Binzhou 256600, Shandong


More Information

Corresponding author: Wei Gang,E-mail:158213989@qq.com

MSC: P941.78;P534.63⁺2

--> Received Date: 11 May 2019
Revised Date: 16 July 2019
Publish Date: 30 September 2019


摘要
摘要:根据粉尘搬运的动力学原理，利用温湿度组合、风力强度变化和粉尘源区收扩演变特点，分析了青藏高原东北缘循化-官亭地区黄土的粒度、磁化率特征及其反映2.6万年以来的气候波动、区域环境变化以及冬夏季风关系等，划分了主要气候演化阶段，取得了以下重要认识：1）山脉阻挡是造成循化-官亭盆地黄土剖面记录气候波动差异的主要影响因素，拉脊山东南段是亚洲冬季风和高原冬季风系统的重要分割线；2）循化盆地和官亭盆地约26 ka B.P.气候变化主要分为2个阶段，每个阶段又可分为若干个亚阶段；3）青藏高原东北缘官亭-循化地区全新世适宜期时间可能为6.0~3.7 ka B.P.，官亭盆地和循化盆地黄土粒度磁化率明显差异的原因可能主要受风场的控制。
关键词: 青藏高原东北缘/
循化盆地/
官亭盆地/
黄土/
气候变化

Abstract:According to the dynamic principle of dust transportation and combining the characteristics on constitution of temperature and humidity, wind intensity change and the evolution of dust source area, two typical loess profiles in the Xunhuan-Guanting areas on the northeastern margin of the Qinghai-Xizang Plateau are studied. They are JC and XK loess-paleosol profiles, and the length of Baizhuang JC profile (35°41'21"N, 102°33'29" E) in Xunhua Basin is 2.3 m in thickness and a total of 47 samples were taken at a interval of 5 cm in this section (including the surface soil and 6¹⁴C age samples). The length of Minhe XK profile (35°59'51"N, 102°44'42" E) in Guanting Basin is 6 m in thickness and a total of 61 samples were taken at a interval of 10 cm (also including 6¹⁴C age samples), in this profile, 0~1.6 m is the paleosol layer and 1.6~6.0 m is the loess layer. We also find that the ages are 26.1 ka B.P. and 23.4 ka B.P. in bottom of JC profile and XK profile by dating methods. Then the grain size and magnetic susceptibility of the loess are analyzed and reflected that the climate volatility, regional environmental changes and the relationship between winter and summer monsoons since 26 ka B.P., based on the above analysis, the main climate evolution stages have been divided. In this paper, the following important understandings have been made:(1) the mountain block is the main influencing factor for the difference in the record of the loess profiles in the Xunhua-Ganting Basin. The southeastern part of the Laji Mountain is an important dividing line for the Asian winter monsoon and the Plateau winter monsoon system. (2) The climate change of the Xunhua Basin and the Guanting Basin is mainly divided into two stages since 26 ka B.P., and each of them can be divided into several sub-stages. (3) The Holocene Optimum period of the Guanting-Xunhua area in the northeastern margin of the Tibetan Plateau may be 6.0~3.7 ka B.P. And the reason for the significant difference in the grain size and magnetic susceptibility of the loess in the Guanting Basin and the Xunhua Basin may be mainly controlled by the wind field.
Key words:northeastern boundary of the Tibetan Plateau/
Xunhua Basin/
Guanting Basin/
loess/
climatic change



PDF全文下载地址:

http://www.dsjyj.com.cn/data/article/export-pdf?id=dsjyj_11675