干旱区生态环境知识资源中心(Arid): 晚第四纪科尔沁黄土堆积的Rb-Sr地球化学特征及古气候变化

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	晚第四纪科尔沁黄土堆积的Rb-Sr地球化学特征及古气候变化
其他题名	Rb/Sr GEOCHEMISTRY OF LOESS DEPOSITS IN THE HORQIN DUNEFIELD,NORTHEASTERN CHINA,AND ITS IMPLICATIONS FOR CLIMATE CHANGE DURING LATE QUATERNARY
	弋双文 1; 鹿化煜 1; 周亚利 2; 王先彦 1; 刘全玉 3
来源期刊	海洋地质与第四纪地质
ISSN	0256-1492
出版年	2013
卷号	33 期号:2 页码:129-136
中文摘要	在科尔沁沙地南缘选取了两个典型的风成黄土-古土壤序列,对其记录的Rb-Sr地球化学特征进行了分析。结果表明,Rb-Sr含量变化与黄土高原黄土-古土壤序列相似,但Rb含量小于黄土高原,Sr含量则相反,可能是因为研究区距源区较近,粒径较粗,加之气候干冷,化学风化强度较弱造成的。总体而言,我国东北地区黄土Rb/Sr值作为反映东亚夏季风强弱变化的替代性指标是可行的。综合分析认为,晚第四纪科尔沁地区古气候存在多次明显的干湿变化,特别是在108~144、23321和867ka前后,气候较为暖湿;在26132ka前后,极为干冷,甚至出现沙漠化过程。晚第四纪科尔沁沙地的古气候变化,是东亚季风强弱变化的反映,也可能是全球气候变化在我国东北地区的体现。
英文摘要	The aeolian silt deposit is a good record of palaeoclimatic and paleoenvironmental changes in Late Quaternary.However, Loess deposition and Palaeoclimatic changes in the Horqin dunefield, Northeastern China, during the late Quaternary remains poorly understood.In this paper, the Rubidium (Rb)and Strontium (Sr)geochemical characteristics of the typical loess sequence in the southern margin of the Horqin dunefield are analyzed.Results show that the variation pattern of Rb-Sr in the Horqin loess are similar to those of the Chinese Loess Plateau, excepted for that the Rb content is lower and the Sr content is higher, probably resulted from the colder and drier climate in this study area, which led to very weak chemical weathering.It further indicates that the variations in Rb/Sr ratio in the Northeastern China loess sequence may represent the alternation of East Asian summer and winter monsoon climates.Based on the Rb-Sr geochemical data, it is suggested that Horqin dunefield had experienced a warmer and wetter climate in the periods of 108-144ka 867ka, and 23321ka, while it was very cold and dry, even worse than the desertification environment in the period of 26232ka.The climate changes in this study area are consistent with variations of the East Asian monsoon during Late Quaternary.It could be a footprint of the global glacial-interglacial climatic variations in northeastern China.
中文关键词	Rb/Sr值 ; 气候变化 ; 东亚季风 ; 晚第四纪 ; 科尔沁沙地
英文关键词	Rb/Sr Climate change East Asian monsoon Late Quaternary Horqin dunefield
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:4836115
来源机构	陕西师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229759
作者单位	1.南京大学地理与海洋科学学院,气候与全球变化研究院, 南京, 江苏 210093, 中国; 2.陕西师范大学旅游与环境学院, 西安, 陕西 710062, 中国; 3.安康学院, 安康, 陕西 725000, 中国
推荐引用方式 GB/T 7714	弋双文,鹿化煜,周亚利,等. 晚第四纪科尔沁黄土堆积的Rb-Sr地球化学特征及古气候变化[J]. 陕西师范大学,2013,33(2):129-136.
APA	弋双文,鹿化煜,周亚利,王先彦,&刘全玉.(2013).晚第四纪科尔沁黄土堆积的Rb-Sr地球化学特征及古气候变化.海洋地质与第四纪地质,33(2),129-136.
MLA	弋双文,et al."晚第四纪科尔沁黄土堆积的Rb-Sr地球化学特征及古气候变化".海洋地质与第四纪地质 33.2(2013):129-136.